REVIEW
revealed: 17 November 2015
doi: 10.3389/fpls.2015.Zero1020
Edited by:
Richard Sayre,
New Mexico Consortium at Los
Alamos Nationwide Labs, USA
Reviewed by:
Shan Lu,
Nanjing College, China
Bala Rathinasabapathi,
College of Florida, USA
*Correspondence:
Zhihui Cheng
chengzh@nwsuaf.edu.cn
Specialty part:
This text was submitted to
Plant Physiology,
a piece of the journal
Frontiers in Plant Science
Acquired: 14 July 2015
Accepted: 04 November 2015
Revealed: 17 November 2015
Quotation:
Cheng F and Cheng Z (2015)
Analysis Progress on the use
of Plant Allelopathy in Agriculture
and the Physiological and Ecological
Mechanisms of Allelopathy.
Entrance. Plant Sci. 6:1020.
doi: 10.3389/fpls.2015.Zero1020
Analysis Progress on the use
of Plant Allelopathy in Agriculture
and the Physiological and Ecological
Mechanisms of Allelopathy
Fang Cheng and Zhihui Cheng*
School of Horticulture, Northwest A&F College, Yangling, China
Allelopathy is a typical organic phenomenon by which one organism produces
biochemicals that affect the expansion, survival, improvement, and replica of
different organisms. These biochemicals are referred to as allelochemicals and have helpful
or detrimental results heading in the right direction organisms. Plant allelopathy is one of the modes of
interplay between receptor and donor crops and will exert both constructive results
(e.g., for agricultural administration, corresponding to weed management, crop safety, or crop reestablishment) or unfavorable results (e.g., autotoxicity, soil illness, or organic invasion).
To make sure sustainable agricultural improvement, you will need to exploit cultivation
techniques that take benefit of the stimulatory/inhibitory affect of allelopathic
crops to control plant development and improvement and to keep away from allelopathic autotoxicity.
Allelochemicals can doubtlessly be used as development regulators, herbicides, pesticides,
and antimicrobial crop safety merchandise. Right here, we reviewed the plant allelopathy
administration practices utilized in agriculture and the underlying allelopathic mechanisms
described within the literature. The foremost factors addressed are as follows: (1) Description
of administration practices associated to allelopathy and allelochemicals in agriculture. (2)
Dialogue of the progress concerning the mode of motion of allelochemicals and the
physiological mechanisms of allelopathy, consisting of the affect on cell microand ultra-structure, cell division and elongation, membrane permeability, oxidative and
antioxidant techniques, development regulation techniques, respiration, enzyme synthesis and
metabolism, photosynthesis, mineral ion uptake, protein and nucleic acid synthesis.
(Three) Analysis of the impact of ecological mechanisms exerted by allelopathy on
microorganisms and the ecological atmosphere. (Four) Dialogue of present issues and
proposal for future analysis instructions on this subject to offer a helpful reference for future
research on plant allelopathy.
Key phrases: allelochemical, allelopathy, agriculture apply, physiological mechanism, ecological mechanism,
microorganism, agricultural sustainable improvement
INTRODUCTION
Allelopathy is a sub-discipline of chemical ecology that’s involved with the results of chemical compounds
produced by crops or microorganisms on the expansion, improvement and distribution of different crops
and microorganisms in pure communities or agricultural techniques (Einhellig, 1995). The research
of allelopathy elevated within the 1970s and has undergone speedy improvement for the reason that mid-1990s,
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Cheng and Cheng Plant Allelopathy Utility and Mechanisms
turning into a well-liked matter in botany, ecology, agronomy, soil
science, horticulture, and different areas of inquiry in latest
years. The allelopathic interplay might be one of the numerous
components contributing to species distribution and abundance inside
plant communities and might be necessary within the success of
invasive crops (Chou, 1999; Mallik, 2003; Discipline et al., 2006;
Inderjit et al., 2006; Zheng et al., 2015), corresponding to water hyacinth
(Eichhornia crassipes Mart. Solms) (Jin et al., 2003; Gao and Li,
2004), noticed knapweed (Centaurea stoebe L. ssp. micranthos)
(Broeckling and Vivanco, 2008) and garlic mustard (Alliaria
petiolata M. Bieb) (Vaughn and Berhow, 1999). Allelopathy is
additionally regarded as one of the oblique causes of steady
cropping obstacles in agriculture. In consequence of the in-depth
research of allelopathy, methods for the administration of agricultural
manufacturing and ecological restoration involving the applying
of allelopathy and allelochemicals are bettering. The primary
functions of this overview are to current conclusions concerning
the applying of allelopathy in agricultural manufacturing, to
spotlight the physiological and ecological mechanisms underlying
plant allelopathy, as an example the impact of allelopathy on
soil microorganisms and to debate key factors for additional
analysis.
ALLELOPATHY AND ALLELOCHEMICALS
The definition of allelopathy was first utilized by Molish in 1937 to
point out all of the results that straight and not directly end result from
biochemical substances transferred from one plant to a different
(Molisch, 1937). Virtually half a century later, the accepted targets
of allelochemicals within the plant kingdom embody algae, fungi
and numerous microorganisms. The time period was refined by Rice
(1984) to outline “any direct or oblique dangerous or helpful
impact by one plant (together with microorganisms) on one other
by manufacturing of chemical compounds that escape into the
atmosphere” (Rice, 1984). In 1996, the Worldwide Allelopathy
Society broadened its definition of allelopathy to confer with any
course of involving secondary metabolites produced by crops,
microorganisms, viruses and fungi that affect the expansion and
improvement of agricultural and organic techniques. As well as,
the allelopathic donor and receiver ought to embody animals (Kong
and Hu, 2001).
Allelochemicals, that are non-nutritive substances primarily
produced as plant secondary metabolites or decomposition
merchandise of microbes, are the lively media of allelopathy.
Allelochemicals consist of numerous chemical households and are
labeled into the next 14 classes primarily based on chemical
similarity (Rice, 1974): water-soluble natural acids, straightchain alcohols, aliphatic aldehydes, and ketones; easy
unsaturated lactones; long-chain fatty acids and polyacetylenes;
Abbreviations: APX, ascorbic acid peroxidase; BNI, organic nitrification inhibition; BNIS, organic nitrification inhibition substances; BOA, 2(3H)-
benzoxazolinone; C4H, cinnamate-Four-hydroxylase; CAT, catalase; COMT, caffeic acid O-methyltransferases; DEP, diethyl phthalate; DIBOA, Four-dihydroxy1,Four(2H)-benzoxazin-Three-one; DTD, [4, 7-dimethyl-1-(propan-2-ylidene)-1, 4, 4a, 8a-tetrahydronaphthalene-2, 6(1H, 7H)-dione]; F5H, ferulic acid 5-hydroxylase;
GR, glutathione reductase; GS, glutamine synthetase; HHO, [6-hydroxyl-5-isopropyl-3, 8-dimethyl-4a, 5, 6, 7, 8, 8a-hexahydronaphthalen-2(1H)-one]; ISR,
induced systemic resistance; MDA, malondialdehyde; NiR, nitrate reductase; NIS, nitrification-inhibiting substances; PA, pyrogallic acid; PAL, phenylalanine
ammonialyase; PDMS, polydimethylsiloxane; PGPR, plant growth-promoting rhizobacteria; POD, peroxidase; PPO, polyphenol oxidase; QTL, quantitative trait
locus; RAPD, random amplification of polymorphic DNA; ROS, reactive oxygen species; SDH, succinodehydrogenase; SOD, superoxide dismutase; STEM,
silicone tubing microextraction.
benzoquinone, anthraquinone and sophisticated quinones; easy
phenols, benzoic acid and its derivatives; cinnamic acid and
its derivatives; coumarin; flavonoids; tannins; terpenoids and
steroids; amino acids and peptides; alkaloids and cyanohydrins;
sulfide and glucosinolates; and purines and nucleosides. Plant
development regulators, together with salicylic acid, gibberellic acid and
ethylene, are additionally thought-about to be allelochemicals. The speedy
progress of Assessment expertise lately has made it attainable
to isolate and determine even minute quantities of allelochemicals and
to carry out refined structural analyses of these molecules.
The buildings of some allelochemicals produced by crops are
proven in Determine 1.
MANAGEMENT OF PLANT ALLELOPATHY
IN AGRICULTURE
Allelopathy is a pure ecological phenomenon. It has been
recognized and utilized in agriculture since historic occasions (Zeng, 2008,
2014). Allelochemicals can stimulate or inhibit plant germination
and development, and allow the event of crops with low
phytotoxic residue quantities in water and soil, thus facilitating
wastewater remedy and recycling (Macias et al., 2003; Zeng
et al., 2008). They’re an acceptable substitute for artificial herbicides
as a result of allelochemicals do not need residual or poisonous results,
though the efficacy and specificity of many allelochemicals
are restricted (Bhadoria, 2011). The primary functions of analysis on
allelopathy embody the applying of the noticed allelopathic
results to agricultural manufacturing, discount of the enter of
chemical pesticides and consequent environmental air pollution, and
provision of efficient strategies for the sustainable improvement
of agricultural manufacturing and ecological techniques (Macias et al.,
2003; Li et al., 2010; Han et al., 2013; Jabran et al., 2015).
The use of allelopathic crops in agriculture is presently being
realized, e.g., as parts of crop rotations, for intercropping,
as cowl crops or as inexperienced manure (Cheema and Khaliq, 2000;
Singh et al., 2003; Cheema et al., 2004; Khanh et al., 2005;
Reeves et al., 2005; Yildirim and Guvenc, 2005; Iqbal et al.,
2007; Mahmood et al., 2013; Wortman et al., 2013; Farooq
et al., 2014; Silva et al., 2014; Wezel et al., 2014; Haider
et al., 2015). The purposes of allelopathy in crop manufacturing
in Pakistan are profitable examples lately (Cheema
et al., 2013). The acceptable software of allelopathy towards the
enchancment of crop productiveness and environmental safety
by environmentally pleasant management of weeds, insect pests,
crop illnesses, conservation of nitrogen in crop lands, and the
synthesis of novel agrochemicals primarily based on allelochemicals has
attracted a lot consideration from scientists engaged in allelopathic
analysis.
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Cheng and Cheng Plant Allelopathy Utility and Mechanisms
FIGURE 1 | Buildings of some of the allelochemicals produced by
crops.
ARRANGEMENT OF CROPPING SYSTEMS
Competitors is one of the primary modes of interplay between
cultivated crops and their neighboring crops (Inderjit and Ethical,
1997; Xiong et al., 2005; He et al., 2012b; An et al., 2013).
Allelopathy is a chemical mechanism that gives crops with
a bonus for competing for restricted assets (Singh et al.,
1999; He et al., 2012b; Gioria and Osborne, 2014). The flexibility of
crops to suppress weeds is thus decided by crop allelopathy
and competitiveness. Crop allelopathy might be successfully used to
management weeds within the subject, to alleviate allelopathic autotoxicity
and cut back inhibitory affect amongst allelopathic crops (Iqbal
et al., 2007; John et al., 2010; Farooq et al., 2013; Andrew et al.,
2015), to enhance the utilization fee of land and to extend the
annual output of the soil by establishing cheap crop rotation
and intercropping techniques. For instance, Odeyemi et al. (2013)
reported relative abundance and inhabitants suppression of plant
parasitic nematodes below Chromolaena odorata (L.) (Asteraceae)
fallow in a subject research performed over 2 years, and instructed
that the use of bush fallow with C. odorata would possibly grow to be an
built-in administration apply within the administration of nematode
pests in crop manufacturing in south-western Nigeria. Intercropping
is a typical apply amongst farmers in growing international locations
for maximizing land assets and lowering the dangers of single
crop failure. Weed inhabitants density and biomass manufacturing
might be markedly decreased utilizing crop rotation and intercropping
techniques (Liebman and Dyck, 1993; Narwal, 2000; Nawaz et al.,
2014; Jabran et al., 2015). Intercropping of sorghum (Sorghum
bicolor L.), sesame (Sesamum indicum L.) and soybean (Glycine
max L.) in a cotton (Gossypium hirsutum L.) subject produced
larger web advantages and a major inhibition on purple nutsedge
(Cyperus rotundus L.) as compared with the cotton alone in a 2-
12 months experiment (Iqbal et al., 2007). Not too long ago, Wang et al. (2015)
reported that eggplant/garlic relay intercropping is a helpful
cultivation apply to take care of stronger eggplant development and
increased yield. Nonetheless, the allelopathy between completely different species
might trigger promontory or inhibitory results. Farooq et al. (2014)
reported that when grown in rotation with tobacco (Nicotiana
tabacum L.), the stand institution and development of maize
(Zea mays L.) had been improved in comparison with mung bean (Vigna
radiata L.), whereas mungbean stand institution and development
had been suppressed. Due to this fact, the allelopathic nature of crops
have to be thought-about in crop rotation, intercropping and stalk
mulching (Xuan et al., 2005; Cheng et al., 2011; Cheng and Xu,
2013).
STRAW MULCHING
In typical agriculture, weed management utilizing herbicides is
not solely an costly apply; it is usually dangerous to the
atmosphere. Allelopathic purposes, corresponding to straw mulching,
present sustainable weed administration (Jabran et al., 2015),
additional lowering the unfavorable influence of agriculture on the
atmosphere (Cheema and Khaliq, 2000; Cheema et al., 2004).
Utilizing allelopathic crops as floor cowl species gives an
environmental pleasant choice (Dhima et al., 2006; Moraes
et al., 2009; Wang et al., 2013a). The allelochemicals from
decomposed straw can suppress weed development in farmlands, and
cut back the incidence of pests and illnesses. Furthermore, straw
mulch can enhance the soil natural matter content material and improve
soil fertility. Nonetheless, it could even have unfavorable results by
rising the C: N ratio of the soil. Analysis has proven that
inexperienced wheat (Triticum aestivum L.) straw inhibits the expansion
of Ipomoea weeds in corn (Zea mays L.) and soybean fields,
thereby lowering the necessity for herbicide software. Rye (Secale
cereale L.) mulch considerably decreased the germination and
development of a number of problematic agronomic grass and broadleaf
weeds (Determine 2; Schulz et al., 2013). The transformation reactions
of rye allelochemicals, i.e., benzoxazinoids, in soil led primarily
to the manufacturing of phenoxazinones, which might be degraded by
a number of specialised fungi through the Fenton response. As a result of of their
selectivity, particular exercise, and presumably restricted persistence
within the soil, benzoxazinoids or rye residues are appropriate means for
weed management (Schulz et al., 2013). Moreover, Tabaglio et al.
(2008) discovered that the allelopathic inhibition results on weeds
differ between completely different cultivars of rye straw used for mulching.
Xuan et al. (2005) concluded that the applying of allelopathic
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Cheng and Cheng Plant Allelopathy Utility and Mechanisms
FIGURE 2 | Discipline trial on rye mulch previous a tomato crop in a organic farm (Schulz et al., 2013). Left, take a look at plot with rye mulch left on the soil floor,
exhibiting the great weed suppression capacity. Proper, management plot with out rye mulch, break up into two remedies: left facet, untreated sub-plot wherein tomato crops are
virtually utterly overgrown by weeds; proper facet, sub-plot with mechanical management by cultivation, wherein tomato crops develop in addition to these within the take a look at plot.
plant supplies at 1–2 tons ha−1
may cut back weed biomass by
roughly 70%, and improve rice (Oryza sativa L.) yield by
roughly 20% in paddy fields (1998–2003) in contrast with
the respective controls. Within the southeastern area of Brazil, espresso
(Coffea arabica) fruit peels, which include allelochemicals such
as phenols, flavonoids and caffeine, are sometimes used as an natural
modification in agricultural apply to manage weeds (Silva et al.,
2013). An et al. (2013) discovered that switchgrass (Panicum virgatum
L.) crops and residues decreased the biomass and density of
related weeds, and their analysis supplied weed administration
methods in agroecosystems and necessary info for the
introduction of switchgrass into new ecosystems. Water extracts
of Conyza bonariensis (L.) Cronquist, Trianthema portulacastrum
L., and Pulicaria undulata (L.) C. A. Mey. might be utilized at a
focus of 10 g L−1
to handle the weed Brassica tournefortii
Gouan by inhibiting germination and seedling development (Abd ElGawad, 2014). Furthermore, some soybeans induce the germination
of sunflower broomrape (Orobanche spp.), a noxious parasitic
weed, which means that soybean has the potential for use as a
lure crop to cut back the seed financial institution of sunflower broomrape (Zhang
et al., 2013b).
DEVELOPING ENVIRONMENTALLY
FRIENDLY AGROCHEMICAL AND
MICROBIAL PESTICIDES
Allelochemicals with unfavorable allelopathic results are necessary
parts of plant protection mechanisms in opposition to weeds and
herbivory. The expertise that modifies allelochemicals for the
manufacturing of environmentally pleasant pesticides and plant
development regulators permits the efficient administration of agricultural
manufacturing and confers few environmental issues within the soil
because of the pretty excessive degradability of allelochemicals (Bhadoria,
2011; Ihsan et al., 2015). Uddin et al. (2014) revealed that
sorgoleone, a hydrophobic compound present in Sorghum bicolor
(L.) root exudates, was more practical in inhibiting weed development
after formulation as a wettable powder, whereas crop species
had been tolerant to it. Some microorganisms are succesful of utilizing
sorgoleone as a carbon supply. Sorgoleone might be mineralized
through full degradation to CO2 in soil, though the completely different
chemical teams of the molecule weren’t mineralized equally
(Gimsing et al., 2009). The robust weed-suppressive capacity of
formulated sorgoleone raised curiosity as an efficient, pure,
environmentally pleasant method for weed administration. Plant
growth-promoting rhizobacteria (PGPR) embody a variety
of helpful micro organism that confer constructive results on crops, such
as eliciting induced systemic resistance (ISR), selling plant
development and lowering susceptibility to illnesses attributable to plant
pathogens (Kloepper et al., 1980, 2004). Allelopathic micro organism can
obtain the identical perform in mixtures of micro organism that exhibit
PGPR attributes and exercise in opposition to allelopathic weeds, which
reduces the inhibitory impact on vulnerable crops attributable to
allelopathic weeds (Kremer, 2006; Mishra and Nautiyal, 2012).
There are some natural herbicides or plant development inhibitors
which were manufactured from allelopathic plant supplies
to inhibit weed development in fields (Guillon, 2003; Ogata et al.,
2008; Miyake, 2009). Ogata et al. (2008) manufactured a kind
of herbicide comprised of a combination of parts extracted
from pine (Pinus L.), hinoki (Chamaecyparis obtusa Endl.), or
Japanese cedar (Cryptomeria japonica D. Don) and bamboo
(Bambusoideae; Poaceae) vinegar, which supplied a sensible
technique of using plant allelopathy in paddy fields.
REDUCTION OF NITROGEN LEACHING
AND ENVIRONMENTAL POLLUTION
Nitrogen leaching is a extreme ecological drawback attributable to water
air pollution. Mineralization of soil natural nitrogen, particularly
the nitrification of nitrogen fertilizer, is one of the primary
causes for the enrichment of nitrogen within the soil. Organic
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Cheng and Cheng Plant Allelopathy Utility and Mechanisms
nitrification inhibition (BNI) has step by step grow to be the primary
goal in investigating the impact of crops on soil nitrification.
In recent times, research have confirmed that nitrification-inhibiting
substances (NIS) produced by crops are the primary selection for soil
nitrification administration. For instance, organic nitrification
inhibition substances (BNIS) are allelochemicals which might be capable of
inhibit soil nitrification. Wheat allelochemicals, corresponding to ferulic
acid, p-hydroxybenzoic acid and hydroxamic acid, can act on
soil microbes to inhibit soil nitrification, cut back the emission
of N2O, enhance the utilization fee of nitrogen fertilizer and
cut back air pollution to the atmosphere (Ma, 2005). Dietz et al.
(2013) discovered that the allelopathic plantain (Plantago lanceolata
L.) plant has inhibitory results on soil nitrogen mineralization,
suggesting that plantain could possibly be utilized to cut back soil nitrogen
leaching.
BREEDING OF ALLELOPATHIC CULTIVARS
Allelopathic cultivars, which have nice potential to attenuate
the introduction of refractory chemical compounds and successfully management
weeds in farmland ecosystems, characterize probably the most promising
software of allelopathy (Mahmoud and Croteau, 2002; Weston
and Duke, 2003; Fragasso et al., 2013). Each typical breeding
strategies and people developed utilizing transgenic expertise can
be utilized within the breeding of allelopathic cultivars. Profitable
cultivars should additionally mix a weed suppression capacity with excessive
yield potential, illness resistance, early maturity and high quality traits
(Gealy and Yan, 2012). Rondo, a rice cultivar that mixes
a excessive yield potential with rice blast resistance and weed
suppression capacity, has been grown in a industrial natural
rice manufacturing operation in Texas and its weed-suppressive
capacity is superior to that of many industrial cultivars (Yan and
McClung, 2010; Gealy and Yan, 2012). Huagan Three, a very
promising F8 technology line derived from crosses between the
native rice cultivars N9S and PI 312777, is taken into account to be
the primary commercially acceptable weed-suppressive cultivar in
China (Kong et al., 2011). Bertholdsson (2010) bred spring wheat
for improved allelopathic potential by typical breeding.
The fabric used originated from a cross between a Swedish
cultivar with low allelopathic exercise and a Tunisian cultivar
with excessive allelopathic exercise. The end result from the sector research
was a 19% common discount in weed biomass for the excessive
allelopathic strains. Nonetheless, a unfavorable impact was that the grain
yield was decreased by 9% within the excessive allelopathic strains. In
this analysis, the excessive allelopathic strains confirmed a decrease early
biomass in contrast with the management. If the early biomass of the
allelopathic wheat had additionally been improved, the weed biomass
ought to have been a lot decrease (Bertholdsson, 2004). Putative
genes associated to the weed competitors capacity of wheat have been
discovered on chromosomes 1A, 2B, and 5D through quantitative trait locus
(QTL) identification, which could be useful for the breeding
of allelopathic wheat (Zuo et al., 2012a). Nonetheless, till now, a
profitable allelopathic wheat cultivar has not been obtained. To
improve crop resistance to steady cropping obstacles and
autotoxicity and within the choice of crop successions, species’
cleansing potential needs to be thought-about as an necessary
indicator of breeding.
MECHANISMS UNDERLYING
ALLELOPATHY
Allelopathy has been studied for fairly a while, and plenty of
points of plant physiological and biochemical processes have
been proved to be affected by allelochemicals (Zeng et al., 2001;
Gniazdowska and Bogatek, 2005). A collection of physiological and
biochemical modifications in crops induced by allelochemicals are
detailed as follows.
CHANGES IN THE MICRO- AND
ULTRA-STRUCTURE OF CELLS
The form and construction of plant cells are affected by
allelochemicals. Unstable monoterpenes, eucalyptol and camphor
can widen and shorten root cells, along with inducing nuclear
abnormalities and rising vacuole numbers (Bakkali et al.,
2008; Pawlowski et al., 2012). Cruz Ortega et al. (1988) discovered that
a corn pollen extract decreased mitotic exercise by greater than 50%,
induced nuclear irregularities and pyknotic nuclei, and inhibited
radicle and hypocotyl development in watermelon (Citrullus lanatus
var. lanatus). Upon publicity to hordenine and gramine, which
are allelochemicals from barley (Hordeum vulgare) roots, the
radicle suggestions of white mustard (Sinapis alba L.) exhibited broken
cell partitions, will increase in each the dimensions and quantity of vacuoles,
disorganization of organelles, and cell autophagy (Liu and
Lovett, 1993). Likewise, cinnamic acid considerably deformed the
ultrastructure of cucumber chloroplasts and mitochondria (Wu
et al., 2004). After remedy with benzoic acid, mustard (Brassica
juncea L.) roots displayed irregularly formed cells organized in a
disorganized method and disruption of cell organelles (Kaur et al.,
2005). Allelochemicals from Convolvulus arvensis L. and catmint
(Nepeta meyeri Benth.) can alter the random amplification of
polymorphic DNA (RAPD) profiles of receiver crops (Kekec
et al., 2013; Sunar et al., 2013). Citral is a risky important oil
part of lemongrass (Cymbopogon citrates) and different
fragrant crops that has been instructed to have allelopathic
traits (Dudai et al., 1999). It was reported that citral may cause
disruption of microtubules in wheat and Arabidopsis thaliana L.
roots, the place the mitotic microtubules had been extra strongly affected
than the cortical microtubules (Chaimovitsh et al., 2010, 2012).
Furthermore, citral has a robust long-term disorganizing impact
on the cell ultra-structure of A. thaliana seedlings, thickening
the cell wall and lowering intercellular communication and the
formation of root hairs (Grana et al., 2013).
INHIBITION OF CELL DIVISION
AND ELONGATION
Allelochemical monoterpenoids (camphor, 1,Eight-cineole, betapinene, alpha-pinene, and camphene) affected cell proliferation
and DNA synthesis in plant meristems (Nishida et al., 2005);
2(3H)-benzoxazolinone (BOA) inhibited the mitotic course of,
particularly the G2-M checkpoint of lettuce (Sanchez-Moreiras
et al., 2008); and sorgoleone decreased the quantity of cells in
every cell division interval, damaging tubulins and leading to
polyploid nuclei (Hallak et al., 1999). Burgos et al. (2004)
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argued that the rye allelochemicals BOA and a couple of, Four-dihydroxy1,Four(2H)-benzoxazin-Three-one (DIBOA) considerably inhibited the
regeneration of cucumber root cap cells and thus inhibited
development. Following the remedy of soybean with aqueous leaf
extracts from Datura stramonium L., Cai and Mu (2012) discovered
that increased concentrations of the extracts inhibited main
root elongation and lateral root improvement, decreased root
hair size and density, inhibited cell division in root suggestions and
elevated the chromosomal aberration index and micronucleus
index. Teerarak et al. (2012) instructed that the ethyl acetate
fraction of Aglaia odorata Lour. leaves inhibited mitosis and
induced mitotic abnormalities in Allium cepa roots by damaging
chromatin group and the mitotic spindle in roots uncovered
to the allelochemicals.
IMBALANCES IN THE ANTIOXIDANT
SYSTEM
The technology and clearing of reactive oxygen species (ROS)
and the stability of the redox state within the cell play an necessary
function in allelopathic results. After publicity to allelochemicals,
the recipient crops might quickly produce ROS within the contact
space (Bais et al., 2003; Ding et al., 2007), and alter the exercise
of antioxidant enzymes corresponding to superoxide dismutase (SOD),
peroxidase (POD; Zeng et al., 2001; Yu et al., 2003) and
ascorbic acid peroxidase (APX; Zuo et al., 2012b) to withstand
oxidative stress. Batish et al. (2008) argued that caffeic acid
induces vital modifications within the actions of proteases, PODs,
and polyphenol oxidases (PPOs) throughout root improvement and
decreases the content material of whole endogenous phenolics in hypocotyl
cuttings from mung bean (Phaseolus aureus). Shearer et al.
(2012) discovered that allelopathic interactions led to modifications in
sign transduction and an imbalance between the manufacturing
of reactive oxidant species and antioxidant capabilities inside a
coral holobiont. This oxidative imbalance resulted in speedy protein
degradation and finally, apoptosis or necrosis of the coral
Acropora millepora when compensatory transcriptional motion by
the coral holobiont insufficiently mitigated the injury prompted
by allelochemicals produced by Chlorodesmis fastigiata (Shearer
et al., 2012).
INCREASES IN CELL MEMBRANE
PERMEABILITY
Many research have proven that allelochemicals considerably inhibit
the exercise of antioxidant enzymes and improve free radical
ranges, leading to larger membrane lipid peroxidation and
membrane potential alteration, which diminish the scavenging
impact on activated oxygen and injury the entire membrane
system of crops (Lin et al., 2000; Zeng et al., 2001; Lin, 2010;
Harun et al., 2014; Sunmonu and Van Staden, 2014). The
development of Hordeum spontaneum, Avena ludoviciana, and wild
mustard seedlings had been discovered to be inhibited by an aqueous
extract of barley aerial elements by rising lipid peroxidation
(Farhoudi et al., 2012; Farhoudi and Lee, 2013). Zuo et al.
(2012b) argued that the mixture of non-sterile shoots of
wheat and Alopecurus aequalis weeds led to the buildup of
oxygen radical species, such because the superoxide radical O2
− anion,
H2O2 and malondialdehyde (MDA) within the leaves of transgenic
(with Cu/ZnSOD and APX genes) and non-transgenic potato
(Solanum tuberosum L.) seedlings, along with rising
membrane permeability and altering the actions of SOD and
APX. Poonpaiboonpipat et al. (2013) discovered that lemongrass
(Cymbopogon citratus) important oil damages the membrane
system of barnyard grass (Echinochloa crus-galli L.), inflicting lipid
peroxidation and electrolyte leakage. Solar et al. (2014) investigated
the technology of ROS induced by pyrogallic acid (PA) in
Microcystis aeruginosa. They discovered O2
− to be the precursor of
H2O2 and confirmed that the hydroxyl radical OH·was generated at
vital ranges, demonstrating that PA prompted oxidative stress
in M. aeruginosa and that futile redox biking of PA was the primary
supply of extreme intracellular O2
− and consequent H2O2 and
OH·manufacturing.
EFFECT ON THE PLANT GROWTH
REGULATOR SYSTEM
Allelochemicals can alter the contents of plant development regulators
or induce imbalances in numerous phytohormones, which inhibits
the expansion and improvement of crops, for instance, with
respect to seed germination and seedling development. Most phenolic
allelochemicals can stimulate IAA oxidase exercise and inhibit
the response of POD with IAA, sure GA or IAA to affect
endogenous hormone ranges (Yang et al., 2005).
Leslie and Romani (1988) discovered that salicylic acid inhibited
the synthesis of ethylene in cell suspension cultures of pear
(Pyrus communis). By way of remedy of wheat seedlings with
excessive concentrations of ferulic acid (2.50 mM), Liu and Hu
(2001) discovered that the expansion of wheat seedlings was inhibited by
the buildup of IAA, GA3, and CTK, with a simultaneous
improve in ABA. An aqueous extract from rice was proven
to considerably stimulate IAA oxidase exercise in barnyard
grass and cut back IAA ranges, thereby damaging the expansion
regulation system and inhibiting seedling development (Lin et al.,
2001). Yang et al. (2008) investigated the mechanisms of
two allelochemicals: DTD [4, 7-dimethyl-1-(propan-2-ylidene)-
1, 4, 4a, 8a-tetrahydronaphthalene-2, 6(1H, 7H)-dione] and
HHO [6-hydroxyl-5-isopropyl-3, 8-dimethyl-4a, 5, 6, 7, 8,
8a-hexahydronaphthalen-2(1H)-one], remoted from Ageratina
adenophora Sprengel weeds. DTD at a better focus
(1.5 mM), considerably elevated the ABA content material within the roots of
rice seedlings, however this decreased sharply after 96 h of remedy.
HHO additionally considerably enhanced the ABA content material for 48 and
96 h. Nonetheless, the applying of DTD or HHO decreased
the IAA and ZR contents in rice roots. The IAA/ABA and
ZR/ABA ratios decreased quantitatively in response to increased
concentrations of DTO or HHO. These outcomes recommend that
the endogenous hormones may need dependent in addition to
interactive results on the responses of rice seedlings and their
adaptability to DTD or HHO stress. Furthermore, the outcomes from
one other research indicated that cyanamide (1.2 mM) prompted an
imbalance of plant hormone (ethylene and auxin) homeostasis
in tomato (Solanum lycopersicum L.) roots (Soltys et al.,
2012).
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Cheng and Cheng Plant Allelopathy Utility and Mechanisms
EFFECT ON THE FUNCTIONS AND
ACTIVITIES OF VARIOUS ENZYMES
Allelochemicals exert completely different results on the synthesis, features,
contents and actions of numerous enzymes. Earlier research
have proven that the important thing enzyme λ-phosphorylase concerned in
seed germination could be inhibited by chlorogenic acid, caffeic
acid and catechol (Rice, 1984; Einhellig, 1995). Moreover,
POD, CAT, and cellulase might be suppressed by tannic acid,
which may additionally cut back the synthesis of amylase and acidphosphatase within the endosperm. Phenolic acids can improve
the exercise of phenylalanine ammonialyase (PAL) and βglucosidase, whereas lowering the exercise of phenol-β-glucose
transferase, thus inhibiting root development. As well as, protease,
invertase and succinodehydrogenase (SDH) might be suppressed by
allelochemicals.
Lin et al. (2001) argued that caffeic acid, gallic acid and phenols
regulate phenylalanine metabolism by suppressing the actions
of PAL and cinnamic acid-Four-hydroxylase. An aquatic extract of
the above-ground elements and rhizospheric soil of chrysanthemum
(Chrysanthemum indicum L.) inhibited the actions of root
dehydrogenase and nitrate reductase (NiR), decreased the contents
of soluble sugar and soluble protein, and inhibited the basis development
of stem cuttings of the identical species (Zhou et al., 2010). Cheng
(2012) investigated the results of diethyl phthalate (DEP) on
the enzyme exercise and polypeptide accumulation of glutamine
synthetase (GS) in larger duckweed (Spirodela polyrhiza L.) and
discovered that DEP is poisonous to this species because of the inhibition of GS
isoenzymes in nitrogen assimilation and antioxidant enzymes.
INFLUENCE ON RESPIRATION
Allelochemicals have an effect on plant development by influencing completely different phases
of respiration, corresponding to electron switch within the mitochondria,
oxidative phosphorylation, CO2 technology and ATP enzyme
exercise. These chemical compounds can cut back oxygen consumption, which
prevents NADH oxidation, inhibits ATP synthesis enzyme
exercise, reduces ATP formation in mitochondria, disturbs plant
oxidative phosphorylation and finally inhibits respiration; on
the opposite hand, they’ll stimulate the discharge of CO2, which
promotes respiration.
Cruz Ortega et al. (1988) discovered that an ethanol extract from
corn pollen acted as an inhibitor of the electron pathway and
decreased oxygen consumption; the precise inhibition web site was
almost definitely situated upstream of cytochrome c. Rasmussen et al.
(1992) discovered that sorgoleone interfered with the perform of
mitochondria remoted from etiolated soybean and corn seedlings
by blocking electron transport on the b-c1 complicated. Furthermore,
Hejl and Koster (2004b) noticed that juglone may attain the
mitochondria within the root cells of corn and soybean seedlings,
thereby disrupting root oxygen uptake. Alpha-pinene, camphor,
limonene and different monoterpenes considerably have an effect on radicle
and hypocotyl mitochondrial respiration in soybean and corn,
however their targets are completely different. Alpha-pinene acts below at the very least
two mechanisms: uncoupling of oxidative phosphorylation and
inhibition of electron switch. Alpha-pinene strongly inhibits
mitochondrial ATP manufacturing, decreases the mitochondrial
transmembrane potential and impairs mitochondrial vitality
metabolism. Camphor causes uncoupling of mitochondria.
Limonene inhibits coupled respiration however doesn’t have an effect on basal
respiration, and inhibits ATP synthetase and the actions of
adenine nucleotide translocase complexes at concentrations of 1.Zero
and 5.Zero mM (Abrahim et al., 2003a,b).
EFFECT ON PLANT PHOTOSYNTHESIS
The impacts of allelochemicals on plant photosynthesis primarily
contain inhibition of or injury to the synthesis equipment and
acceleration of the decomposition of photosynthetic pigments.
Consequently, photosynthetic pigment contents are decreased,
which blocks vitality and electron switch, reduces ATP synthesis
enzyme exercise, inhibits the synthesis of ATP, and impacts stomatal
conductance and transpiration, which inhibit the photosynthetic
course of (Meazza et al., 2002; Yu et al., 2003, 2006; Wu et al., 2004).
Allelochemicals have an effect on photosynthesis primarily by influencing the
perform of PS II (Weir et al., 2004; Wang et al., 2014). For instance,
sorgoleone inhibits the decay of variable fluorescence, blocks
the oxidation of the PSII-reduced main electron acceptor,
Q
−
A, by the PSII secondary electron acceptor and that of QB by
displacing QB from the D1 protein, thus inhibiting photochemical
results (Gonzalez et al., 1997). Equally, Shao et al. (2009)
demonstrated that the D1 protein is a crucial goal within the
injury prompted to Microcystis by pyrogallol. Furthermore, Uddin
et al. (2012) discovered that sorgoleone decreased the Fv/Fm of weeds
and inhibited weed development. By finding out the inhibitory impact
of the dried macroalga Gracilaria tenuistipitata (Rhodophyta)
on the microalga Phaeodactylum tricornutum, Ye et al. (2013)
discovered a lower within the quantity of lively response facilities and
blockade of the electron transport chain. Poonpaiboonpipat et al.
(2013) noticed that a excessive focus of important oil from
lemongrass (Cymbopogon citratus) leaves considerably decreased
the chlorophyll a and b and carotenoid contents of barnyard
grass and affected alpha-amylase exercise in seeds, indicating that
important oil interferes with photosynthetic metabolism. Nonetheless,
aqueous extracts of leaves from Trema micrantha (Ulmaceae), an
allelopathic plant, didn’t result in inhibition of the synthesis of
photosynthetic pigments in radish (Raphanus sativus L.) (Borella
et al., 2014).
INFLUENCE ON WATER AND NUTRIENT
UPTAKE
Many allelochemicals have an effect on nutrient absorption in plant roots
or induce water stress by long-term inhibition of water
utilization. Allelochemicals can inhibit the actions of Na+/Ok+-
ATPase concerned within the absorption and transport of ions on the
cell plasma membrane, which suppresses the mobile absorption
of Ok+, Na+, or different ions.
Bergmark et al. (1992) discovered that ferulic acid (250 µM)
inhibited ammonium and NO3
− uptake in corn seedlings,
though ammonium uptake was much less delicate to this remedy
than NO3
−. Ferulic acid additionally inhibits Cl− uptake and will increase
the preliminary web Ok+ loss from roots uncovered to a low Ok ammonium
nitrate resolution and delays restoration that ends in a constructive
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Cheng and Cheng Plant Allelopathy Utility and Mechanisms
web uptake. Yuan et al. (1998) confirmed that the results of
allelochemicals, corresponding to ferulic acid, benzaldehyde and Four-tertbutylbenzoic acid, on nitrogen absorption in wheat seedlings
are negatively correlated, however the unfavorable results of NH4
+-N
on nitrogen absorption had been stronger than these of NO3
−-
N. Yu and Matsui (1997) noticed that cinnamic acid and
the basis exudates of cucumber inhibited the uptake of NO3
−,
SO4
2−, Ok+, Ca2+, Mg2+, and Fe2+ by cucumber seedlings.
By way of additional research, Lv et al. (2002) discovered that cinnamic
acid and p-hydroxybenzoic, the primary allelochemicals present in
cucumber root exudates, strongly inhibited the actions of root
dehydrogenase, root-combined ATPase and nitrate reductase in
cucumber, thus inhibiting the basis uptake of Ok+, NO3
−, and
H2PO4
−. Sorgoleone and juglone considerably inhibited H+-
ATPase exercise and the proton-pumping perform throughout the basis
cell plasmalemma, which affected solute and water uptake in
peas (Pisum sativum L.), soybeans and corn (Hejl and Koster,
2004a,b). Abenavoli et al. (2010) discovered that the allelochemicals
trans-cinnamic, ferulic acid and p-coumaric acid inhibited web
nitrate uptake and plasma membrane H+-ATPase exercise in
maize seedlings, whereas umbelliferone and caffeic acid had no
impact on H+-ATPase exercise. Sunflower (Helianthus annus L.)
residues negatively affected plant improvement, the effectivity of
translocation of assimilates and nutrient accumulation in radish
crops (Barros de Morais et al., 2014).
The results of allelochemicals on ion uptake are intently associated
to allelochemical concentrations and classifications. For instance,
a low focus of dibutyl phthalate will increase the absorption
of N however decreases that of P and Ok. Nonetheless, a excessive focus
of this chemical inhibits the absorption of N, P and Ok. Equally, a
low focus of diphenylamine stimulates the absorption of
N and Ok however inhibits the absorption of P by tomato roots (Geng
et al., 2009).
INFLUENCE ON PROTEIN AND NUCLEIC
ACID SYNTHESIS AND METABOLISM
Most alkaloids present allelopathic potential. Some can intently
combine with DNA and improve the temperature of DNA
cleavage, whereas some can inhibit DNA polymerase I and forestall
the transcription and translation of DNA, whereas others can
inhibit protein biosynthesis (Wink and Latzbruning, 1995).
Allelochemicals may also inhibit amino acid absorption, in
addition to move, thus interfering with protein synthesis,
which impacts cell development (Abenavoli et al., 2003). All phenolic
acids can have an effect on the integrity of DNA and RNA. Ferulic acid
and cinnamic acid in addition to many phenols and alkaloids can
additionally inhibit protein synthesis (Baziramakenga et al., 1997; Zeng
et al., 2001; Li et al., 2010). This implies that the noticed
allelopathic phenomenon is partly a end result of the interplay of
the allelochemicals with these primary targets, corresponding to DNA, RNA,
protein biosynthesis and associated processes.
By analyzing the gene expression profile of A. thaliana after
remedy with fagomine, gallic acid, and rutin, that are
allelochemicals present in buckwheat (Fagopyrum esculentum
Moench), Golisz et al. (2008) noticed that genes that reacted to
the allelochemicals primarily fell into a number of practical classes:
interplay with the atmosphere, subcellular localization,
proteins with a binding perform or cofactor requirement, cell
rescue, protection and virulence, or metabolism. The plant response
to allelochemicals was much like the response to biotic or abiotic
stress. This indicated that allelochemicals may need related
features within the cross-talk between biotic and abiotic stress
signaling, as they generate ROS (Bais et al., 2003; Baerson et al.,
2005; Golisz et al., 2008, 2011). Shao et al. (2009) discovered that
the allelochemical pyrogallol impacts the expression of psbA,
mcyB, prx, and faab( in Microcystis aeruginosa, and indicated
that membranes are the primary goal within the injury of Microcystis
attributable to pyrogallol. Guo et al. (2011) confirmed that HHO affected
the expression of CHS, which is related to the synthesis
of numerous amino acids in Eupatorium adenophorum roots.
Cyanamide alters the expression of the expansin genes, LeEXPA9
and LeEXPA18, that are answerable for cell wall reworking
after cytokinesis, thereby inhibiting the formation of tomato root
(Soltys et al., 2012). In a latest research, Fang et al. (2015) discovered
that the expression ranges of miRNAs related to plant hormone
sign transduction, p53 signaling pathways, nucleotide excision
restore and the peroxisome proliferator-activated receptor had been
enhanced in barnyard grass co-cultured with allelopathic rice or
handled with rice-produced phenolic acids. Kato-Noguchi et al.
(2013) reported that the rice allelochemicals momilactone A and
B would possibly inhibit the germination of Arabidopsis seeds by inhibiting
the degradation course of of the storage proteins cruciferin and
cruciferina.
Allelochemicals produced by donor crops act on receiver
crops, whereas the receiver crops will react to the donor
crops by inducing modifications in gene expressions. The upregulated expression of PAL, cinnamate-Four-hydroxylase
(C4H), ferulic acid 5-hydroxylase (F5H), and caffeic acid
O-methyltransferases (COMT), that are concerned within the
biosynthesis of phenolic compounds in rice, is in step with
their inhibitory results on barnyard grass, whereas barnyard grass
induces the expression of genes associated to the synthesis of
phenolic compounds in allelopathic rice (He et al., 2012a).
EFFECTS OF ALLELOCHEMICALS ON
MICROORGANISMS AND THE
ECOLOGICAL ENVIRONMENT
Researchers have discovered that there are vital relationships
between crop development and soil microbes below the applying of
allelochemicals or within the presence of allelopathic crops (Determine Three;
Barazani and Friedman, 1999; Bais et al., 2006; Mishra et al., 2013).
Current research demonstrated that oblique results of allelopathy as
a mediator of plant–plant interactions had been extra necessary than
the direct results of an inhibitor (Zeng, 2014). Chemical-specific
modifications in soil microbes may generate unfavorable feedbacks in soil
illness and plant development (Stinson et al., 2006; Huang et al., 2013;
Zhou et al., 2013; Li et al., 2014). In the meantime, the rhizosphere soil
microbes contribute to the allelopathic potential of crops by
constructive suggestions (Inderjit et al., 2011; Zuo et al., 2014; Wu et al.,
2015). Micro organism may help to extend inhibition by activating a
non-toxic kind of an allelochemical (Macias et al., 2003). For
instance, non-glycosylated compounds could also be modified after
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Cheng and Cheng Plant Allelopathy Utility and Mechanisms
FIGURE Three | A schematic diagram exhibiting the assorted roles of microbes in modulating the interplay of allelopathic donor-receiver species
(Barazani and Friedman, 1999; Bais et al., 2006; Mishra et al., 2013). Pink arrows with double strains point out the phenomenon of allelopathy, and blue arrows
with single strains point out the involvement of numerous microbial processes in lowering/enhancing allelopathic inhibition by soil microorganisms. This determine explains that
helpful rhizobacteria can decrease the phytotoxicity of the allelopathic donor towards the allelopathic receiver through the use of numerous rhizospheric processes corresponding to
rhizosphere colonization, biofilm formation, and degradation/transformation of poisonous allelochemicals or modulation of the protection mechanism in receiver species by
inducing the expression of stress responsive genes or the exercise of antioxidant enzymes. Moreover, microbes can also play an necessary function within the activation of
allelochemicals, e.g., by the discharge of non-toxic glycosides adopted by microbial degradation to launch the lively allelochemical.
launch from crops and grow to be extra poisonous (Tanrisever et al.,
1987; Macias et al., 2005a). Nonetheless, micro organism may also Help
vulnerable crops to tolerate biotic stress related to weeds,
and to lower the allelopathic inhibition of weeds by inflicting
alterations within the expression patterns of some genes that may
be answerable for completely different features however finally result in a
self-defense course of (Mishra and Nautiyal, 2012). As well as,
the microbial degradation/transformation of allelochemicals in
soil impacts the efficient dose of allelochemicals that may trigger
plant inhibition (Mishra et al., 2013; Li et al., 2015). Bacterial
biofilms in rhizospheric areas can shield colonization websites
from phytotoxic allelochemicals and may cut back the toxicity of
these chemical compounds by degrading them (Mishra and Nautiyal, 2012;
Mishra et al., 2012). Microorganisms have the flexibility to change
the parts of allelochemicals launched into an ecosystem,
highlighting their key function in chemical plant–plant interactions
and suggesting that allelopathy is more likely to form the vegetation
composition and take part within the management of biodiversity in
ecology (Fernandez et al., 2013). Some sesquiterpenoid lactones
and sulfides are antimicrobial and may disrupt the cell partitions
of fungi and invasive micro organism, whereas others can shield crops
from environmental stresses that will in any other case trigger oxidative
injury (Khan et al., 2011; Chadwick et al., 2013). Zhang et al.
(2013a) discovered that antifungal volatiles launched from Chinese language
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Cheng and Cheng Plant Allelopathy Utility and Mechanisms
chive (Allium Tuberosum Rottler) helped to manage Panama
illness (Fusarium wilt) in banana (Musa spp.) and confirmed
that intercropping/rotation of banana with Chinese language chive may
management Panama illness and improve cropland biodiversity.
Wang et al. (2013b) indicated that the shift within the microbial
group composition induced by barnyard grass infestation
would possibly generate a constructive suggestions in rice development and
replica in a given paddy system. The relative abundance
and inhabitants of plant parasitic nematodes had been considerably
decreased within the presence of Chromolaena odorata (Asteraceae)
fallow (Odeyemi et al., 2013). Pearse et al. (2014) discovered that
radish soils had a web constructive impact on Lupinus nanus biomass
and defined that radish would possibly alter the mutualistic/parasitic
relationship between L. nanus and its rhizobial associates, with a
web profit to L. nanus. Fang et al. (2013) indicated that inhibiting
the expression of the rice PAL gene decreased the allelopathic
potential of rice and the variety of the rhizosphere microflora.
These findings instructed that PAL features as a constructive
regulator of the rice allelopathic potential.
PGPR, corresponding to root-colonizing Pseudomonas, Paenibacillus
polymyxa, endophytes and Chryseobacterium balustinum Aur9,
have been proven to change plant gene expression and regulate
plant allelochemical synthesis and signaling pathways to boost
illness resistance, adaptability and protection capabilities in
response to biotic and abiotic stresses in crops (van Loon, 2007;
Dardanelli et al., 2010; Mishra and Nautiyal, 2012).
PROBLEMS AND FUTURE RESEARCH
DIRECTIONS
Allelochemicals primarily consist of secondary metabolites which might be
launched into the atmosphere by pure pathways, corresponding to
volatilization, leaf leaching, residue decomposition, and/or root
exudation. Due to this fact, it ought to first be famous how allelochemicals
are launched into the atmosphere (Inderjit and Nilsen, 2003).
The exercise of allelochemicals varies with analysis strategies
and operational processes (Peng et al., 2004). The pure state of
allelochemicals could also be modified considerably in the course of the course of of
extraction (Li et al., 2002). Due to this fact, researchers have to be cautious
to find out whether or not a plant has allelopathic potential or separate
and determine allelochemicals utilizing natural solvents and aqueous
extracts from plant tissues.
An allelochemical launched into the atmosphere is often not
a single substance, and the quantities of allelochemicals launched
below completely different circumstances range. Due to this fact, each the sort and
quantity of allelochemicals launched by crops needs to be thought-about
when their allelopathic potential is investigated. Interactions such
as synergy, antagonism and incremental results between completely different
allelochemicals needs to be evaluated as a result of one allelochemical
might not present allelopathic exercise as a single part in a
sure scenario, however would possibly improve allelopathy in affiliation
with different allelochemicals (Albuquerque et al., 2010).
The sort and quantity of allelochemicals launched into the
atmosphere depend upon the mixed results of the plant itself
(plant components) and environmental components, as proven in Determine Four
(Albuquerque et al., 2010). The plant components embody the species,
selection, development stage and completely different tissues (Belz, 2007; Leao et al.,
FIGURE Four | Induction of allelochemical manufacturing by the plant itself
and environmental components (Half of this determine was modified from
Albuquerque; Albuquerque et al., 2010). The plant components embody species,
selection, development stage, tissue kind, and so forth. Environmental components embody abiotic
components (irradiation, temperature, nutrient limitation, moisture, pH) and biotic
components (plant competitors, illnesses, bugs, animal assault and receptor
suggestions regulation).
2012; Iannucci et al., 2013). Allelopathic results range between
varieties or genotypes (Li and Shen, 2006; Zhou et al., 2011;
Leao et al., 2012). Crops from the identical atmosphere or with
shut taxonomic proximity don’t essentially show related
manufacturing of secondary metabolites, and so they might subsequently
not secrete the same amount and high quality of allelochemicals
or have related allelopathic results (Chon and Nelson, 2010;
Hagan et al., 2013; Imatomi et al., 2013). Lin et al. (2000)
discovered that varietal variations within the allelopathic potential of
rice had been associated to the genetic background. Environmental
components embody each abiotic components (e.g., irradiation, temperature,
nutrient limitation, moisture, pH) and biotic components (e.g., plant
competitors, illnesses, bugs, animal invasion, receptor suggestions
regulation; Anaya, 1999). In a latest research, endogenous ranges of
allelochemicals had been used as indices of abiotic stress resistance.
In the meantime, the exogenous software of allelochemicals has
been discovered to extend the endogenous stage of the receivers,
with a simultaneous improve in development and resistance in opposition to
abiotic stresses (Maqbool et al., 2013); consequently, acceptable
environmental circumstances are obligatory for allelopathic research. It
has been famous that a stress atmosphere can improve the discharge
of allelochemicals from allelopathic crops (Albuquerque et al.,
2010). By way of finding out the dynamic launch of allelochemicals
below completely different stress environments, we will make clear the discharge
traits of allelochemicals and decide the circumstances
required for allelochemical launch, thereby revealing the character
of allelochemicals.
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Cheng and Cheng Plant Allelopathy Utility and Mechanisms
Allelochemicals might be degraded after they’ve been launched
into the soil; the half-life of allelochemicals varies from a couple of hours
to a couple months (Demuner et al., 2005; Macias et al., 2005b; Wang
et al., 2007; Barto and Cipollini, 2009; Bertin et al., 2009), and
that is primarily related to the allelochemical focus,
soil kind, soil enzymes, and soil microbial inhabitants and
group construction (Macias et al., 2004; Understrup et al.,
2005; Kong et al., 2008; Gu et al., 2009). Earlier research
indicated that some allelochemicals had large spatial and
temporal heterogeneity (Weidenhamer, 2005; Dayan et al., 2009;
Mohney et al., 2009; Weidenhamer et al., 2009, 2014), however these
traits of most allelochemicals haven’t been confirmed.
It was reported that polydimethylsiloxane (PDMS) microtubing
(silicone tubing microextraction, or STME) could possibly be used as a
device to offer a extra finely resolved image of allelochemical
dynamics within the root zone (Weidenhamer, 2005; Mohney et al.,
2009; Weidenhamer et al., 2009, 2014). Till now, a lot stays
unknown in regards to the destiny or persistence of allelochemicals within the
soil or their results on soil chemistry or microflora (Belz, 2007).
Explaining how allelochemicals perform is sophisticated due
to the numerous lessons of chemical compounds and completely different buildings that
have been recognized as brokers in allelopathy. There isn’t a generic
allelochemical, and we must always definitely anticipate completely different
mechanisms of motion amongst allelopathic chemical compounds. Furthermore, it
needs to be investigated in future research whether or not allelochemicals
are absorbed by transport proteins or whether or not completely different
allelochemicals have the identical molecular targets in numerous
species (Weston and Mathesius, 2013). The systematic research of
allelochemical cleansing mechanisms in numerous species will
Help reveal the variations in cleansing mechanisms between
crops and microbes.
Allelopathy is a fancy course of. Many allelochemicals
have been recognized to this point. As a result of completely different sensitivities
of completely different receptors to the identical allelochemical and the
numerous allelopathic actions of completely different allelochemicals,
appreciable additional work is required within the subject of allelochemical
analysis. Little or no is thought in regards to the transportation and
biodegradation of allelochemicals in soil or the inhabitants
genetics of allelopathic species, the institution of sensible methods
of utilizing allelochemicals within the subject, the speedy adaptation of weeds
to keep away from them, the variety of the soil microbial group that
is maintained of their presence or the function of sign transduction
in herbivore protection. These areas needs to be the main target of future
investigations.
Appreciable analysis has confirmed that allelopathy has good
software potential in agricultural manufacturing. Till now, many
allelopathic crops have been utilized in agricultural manufacturing, however
the purposes are restricted to small-scale and regional areas. The
construction and mode of motion of many allelochemicals have been
deeply revealed lately, and this has laid a superb basis
for tasks the place allelochemicals are used to acquire the fundamental
buildings or templates for growing new artificial herbicides.
The generally used strategies of weed management (herbicide
software, mechanical weeding and hand weeding) are
efficient in agricultural manufacturing. Nonetheless, there are numerous
disadvantages related to these strategies, for instance, the
evolution of herbicide resistance in weeds, the unfavorable impacts
of herbicides on environmental, human and animal well being,
the expense of herbicides, the losses in soil construction and the
monumental labor necessities. Many of the above issues can
be allayed by creating variety in weed management practices with
the applying of allelopathy. The mix of greater than
one weed management technique has been proved to be efficient in
lowering the likelihood of herbicide resistance improvement in
weeds. Furthermore, the mixed software of decreased artificial
herbicides dose and allelopathic extracts can present management that
is as efficient as that obtained from the usual dose of herbicides
(Farooq et al., 2011). Additional, utilizing various weed administration
practices in sure fields can guarantee sustainable and efficient
weed management.
CONCLUSION
Allelopathy has been recognized and utilized in agriculture since
historic occasions; nevertheless, its recognition and use in trendy
agriculture are very restricted. Allelopathy performs an necessary
function in investigations of acceptable farming techniques in addition to
within the management of weeds, illnesses and bugs, the alleviation of
steady cropping obstacles, and allelopathic cultivar breeding.
Moreover, allelochemicals can act as environmentally pleasant
herbicides, fungicides, pesticides and plant development regulators,
and may have nice worth in sustainable agriculture. Though
allelochemicals used as environmentally pleasant herbicides has
been tried for many years, there are only a few pure herbicides on
the market which might be derived from an allelochemical. Nonetheless,
there are a couple of analysis investigations testing natural-product
herbicides. With rising emphasis on natural agriculture and
environmental safety, rising consideration has been paid
to allelopathy analysis, and the physiological and ecological
mechanisms of allelopathy are step by step being elucidated.
Furthermore, progress has been made in analysis on the related
molecular mechanisms. It’s apparent that allelopathy requires
additional analysis for widespread software in agricultural
manufacturing worldwide.
ACKNOWLEDGMENTS
The authors acknowledge the editors for offering us with this
alternative to share our understanding of the practices of plant
allelopathy in agriculture and the physiological and ecological
mechanisms of allelopathy. This analysis and the writing of this
overview had been supported by a challenge of the Nationwide Pure Science
Basis of China (No. 31471865).
REFERENCES
Abd El-Gawad, A. M. (2014). Ecology and allelopathic management of Brassica
tournefortii in reclaimed areas of the Nile Delta, Egypt. Turk. J. Bot. 38, 347–357.
doi: 10.3906/bot-1302-29
Abenavoli, M. R., Lupini, A., Oliva, S., and Sorgona, A. (2010). Allelochemical
results on web nitrate uptake and plasma membrane H+-ATPase exercise in maize
seedlings. Biol. Plant. 54, 149–153. doi: 10.1007/s10535-Zero10-0024-Zero
Abenavoli, M. R., Sorgona, A., Sidari, M., Badiani, M., and Fuggi, A. (2003).
Coumarin inhibits the expansion of carrot (Daucus carota L. cv. Saint Valery) cells
Frontiers in Plant Science | www.frontiersin.org 11 November 2015 | Quantity 6 | Article 1020
Cheng and Cheng Plant Allelopathy Utility and Mechanisms
in suspension tradition. J. Plant Physiol. 160, 227–237. doi: 10.1078/0176-1617-
00867
Abrahim, D., Francischini, A. C., Pergo, E. M., Kelmer-Bracht, A. M., and
Ishii-Iwamoto, E. L. (2003a). Results of alpha-pinene on the mitochondrial
respiration of maize seedlings. Plant Physiol. Biochem. 41, 985–991. doi:
10.1016/j.plaphy.2003.07.003
Abrahim, D., Takahashi, L., Kelmer-Bracht, A. M., and Ishii-Iwamoto, E. L. (2003b).
Results of phenolic acids and monoterpenes on the mitochondrial respiration of
soybean hypocotyl axes. Allelopathy J. 11, 21–30.
Albuquerque, M. B., Santos, R. C., Lima, L. M., Melo Filho, P. D. A., Nogueira, R. J.
M. C., Câmara, C. A. G., et al. (2010). Allelopathy, an alternate device to enhance
cropping techniques. Rev. Agron Sust. Dev. 31, 379–395. doi: 10.1051/agro/2010031
Anaya, A. L. (1999). Allelopathy as a device within the administration of biotic
assets in agroecosystems. Crit. Rev. Plant Sci. 18, 697–739. doi:
10.1080/07352689991309450
Andrew, I. Ok. S., Storkey, J., and Sparkes, D. L. (2015). A overview of the potential for
aggressive cereal cultivars as a device in built-in weed administration. Weed Res.
55, 239–248. doi: 10.1111/wre.12137
An, Y., Ma, Y. Q., and Shui, J. F. (2013). Switchgrass (Panicum virgatum L.) crops
and switchgrass residue cut back the biomass and density of related weeds.Acta
Agric. Scand. 63, 107–113. doi: 10.1080/09064710.2012.729605
Baerson, S. R., Sanchez-Moreiras, A., Pedrol-Bonjoch, N., Schulz, M., Kagan, I.
A., Agarwal, A. Ok., et al. (2005). Detoxing and transcriptome response in
Arabidopsis seedlings uncovered to the allelochemical benzoxazolin-2(3H)-one. J.
Biol. Chem. 280, 21867–21881. doi: 10.1074/jbc.M500694200
Bais, H. P., Vepachedu, R., Gilroy, S., Callaway, R. M., and Vivanco, J. M. (2003).
Allelopathy and unique plant invasion: from molecules and genes to species
interactions. Science 301, 1377–1380. doi: 10.1126/science.1083245
Bais, H. P., Weir, T. L., Perry, L. G., Gilroy, S., and Vivanco, J. M. (2006). The function
of root exudates in rhizosphere interactions with crops and different organisms.
Annu. Rev. Plant Biol. 57, 233–266. doi: 10.1146/annurev.arplant.57.032905.
105159
Bakkali, F., Averbeck, S., Averbeck, D., and Idaomar, M. (2008). Organic
results of important oils—a overview. Meals Chem. Toxicol. 46, 446–475. doi:
10.1016/j.fct.2007.09.106
Barazani, O., and Friedman, J. (1999). Allelopathic micro organism and their influence on
increased crops. Crit. Rev. Plant Sci. 18, 741–755. doi: 10.1080/07352689991309469
Barros de Morais, C. S., Silva Dos Santos, L. A., and Vieira Rossetto, C. A. (2014).
Oil radish improvement agronomic affected by sunflower crops reduces. Biosci.
J. 30, 117–128.
Barto, E. Ok., and Cipollini, D. (2009). Half-lives and subject soil concentrations
of Alliaria petiolata secondary metabolites. Chemosphere 76, 71–75. doi:
10.1016/j.chemosphere.2009.02.Zero20
Batish, D. R., Singh, H. P., Kaur, S., Kohli, R. Ok., and Yadav, S. S. (2008).
Caffeic acid impacts early development, and morphogenetic response of hypocotyl
cuttings of mung bean (Phaseolus aureus). J. Plant Physiol. 165, 297–305. doi:
10.1016/j.jplph.2007.05.003
Baziramakenga, R., Leroux, G. D., Simard, R. R., and Nadeau, P. (1997). Allelopathic
results of phenolic acids on nucleic acid and protein ranges in soybean seedlings.
Can. J. Bot. 75, 445–450. doi: 10.1139/b97-047
Belz, R. G. (2007). Allelopathy in crop/weed interactions–an replace. Pest. Manag.
Sci. 63, 308–326. doi: 10.1002/ps.1320
Bergmark, C. L., Jackson, W. A., Volk, R. J., and Blum, U. (1992). Differential
inhibition by ferulic acid of nitrate and ammonium uptake in Zea mays L. Plant
Physiol. 98, 639–645. doi: 10.1104/pp.98.2.639
Bertholdsson, N. O. (2004). Variation in allelopathic exercise over 100 years
of barley choice and breeding. Weed Res. 44, 78–86. doi: 10.1111/j.1365-
3180.2003.00375.x
Bertholdsson, N. O. (2010). Breeding spring wheat for improved allelopathic
potential. Weed Res. 50, 49–57. doi: 10.1111/j.1365-3180.2009.00754.x
Bertin, C., Harmon, R., Akaogi, M., Weidenhamer, J. D., and Weston, L. A.
(2009). Assessment of the phytotoxic potential of m-tyrosine in laboratory soil
bioassays. J. Chem. Ecol. 35, 1288–1294. doi: 10.1007/s10886-009-9707-Four
Bhadoria, P. (2011). Allelopathy: a pure approach in the direction of weed administration. Am. J.
Exp. Agric. 1, 7–20.
Borella, J., Martinazzo, E. G., Aumonde, T. Z., Do Amarante, L., De Moraes, D.
M., and Villela, F. A. (2014). Efficiency of radish seeds and seedlings below
motion of aqueous extract of leaves of Trema Micrantha (Ulmaceae). Biosci. J. 30,
108–116.
Broeckling, C. D., and Vivanco, J. M. (2008). A selective, delicate, and
speedy in-field assay for soil catechin, an allelochemical of Centaurea
maculosa. Soil Biol. Biochem. 40, 1189–1196. doi: 10.1016/j.soilbio.2007.
12.013
Burgos, N. R., Talbert, R. E., Kim, Ok. S., and Kuk, Y. I. (2004). Progress inhibition
and root ultrastructure of cucumber seedlings uncovered to allelochemicals
from rye (Secale cereale). J. Chem. Ecol. 30, 671–689. doi: 10.1023/B:JOEC.
0000018637.94002.ba
Cai, S. L., and Mu, X. Q. (2012). Allelopathic potential of aqueous leaf extracts of
Datura stramonium L. on seed germination, seedling development and root anatomy
of Glycine max (L.) Merrill. Allelopathy J. 30, 235–245.
Chadwick, M., Trewin, H., Gawthrop, F., and Wagstaff, C. (2013). Sesquiterpenoids
lactones: advantages to crops and other people. Int. J. Mol. Sci. 14, 12780–12805. doi:
10.3390/ijms140612780
Chaimovitsh, D., Abu-Abied, M., Belausov, E., Rubin, B., Dudai, N., and Sadot, E.
(2010). Microtubules are an intracellular goal of the plant terpene citral. Plant
J. 61, 399–408. doi: 10.1111/j.1365-313X.2009.04063.x
Chaimovitsh, D., Rogovoy Stelmakh, O., Altshuler, O., Belausov, E., Abu-Abied,
M., Rubin, B., et al. (2012). The relative impact of citral on mitotic microtubules
in wheat roots and BY2 cells. Plant Biol. 14, 354–364. doi: 10.1111/j.1438-
8677.2011.00511.x
Cheema, Z. A., and Khaliq, A. (2000). Use of sorghum allelopathic properties to
management weeds in irrigated wheat in a semi arid area of Punjab. Agric. Ecosyst.
Environ. 79, 105–112. doi: 10.1016/S0167-8809(99)00140-1
Cheema, Z. A., Khaliq, A., and Saeed, S. (2004). Weed management in maize (Zea
mays L.) by sorghum allelopathy. J. Maintain. Agric. 23, 73–86. doi:
10.1300/J064v23n04_07
Cheema, Z., Farooq, M., and Khaliq, A. (2013). “Utility of allelopathy in crop
manufacturing: success story from Pakistan,” in Allelopathy, eds Z. A. Cheema, M.
Farooq, and A. Wahid (Berlin Heidelberg: Springer-Verlag Press), 113–143.
Cheng, T. S. (2012). The poisonous results of diethyl phthalate on the exercise of glutamine
synthetase in larger duckweed (Spirodela polyrhiza L.). Aquat. Toxicol. 124–125,
171–178. doi: 10.1016/j.aquatox.2012.08.Zero14
Cheng, Z. H., Wang, C. H., Xiao, X. M., and Khan, M. A. (2011). Allelopathic results
of decomposing garlic stalk on some vegetable crops. Afric. J. Biotechnol. 10,
15514–15520.
Cheng, Z. H., and Xu, P. (2013). Lily (Lilium spp.) root exudates exhibit completely different
allelopathies on 4 vegetable crops. Acta Agric. Scand. 63, 169–175. doi:
10.1080/09064710.2012.734323
Chon, S. U., and Nelson, C. J. (2010). Allelopathy in compositae crops. A overview.
Agron. Maintain. Dev. 30, 349–358. doi: 10.1051/agro/2009027
Chou, C. H. (1999). Roles of allelopathy in plant biodiversity and sustainable
agriculture. Crit. Rev. Plant Sci. 18, 609–636. doi: 10.1016/S0735-2689
(99)00393-7
Cruz Ortega, R., Anaya, A. L., and Ramos, L. (1988). Results of allelopathic
compounds of corn pollen on respiration and cell division of watermelon. J.
Chem. Ecol. 14, 71–86. doi: 10.1007/BF01022532
Dardanelli, M. S., Manyani, H., Gonzalez-Barroso, S., Rodriguez-Carvajal, M. A.,
Gil-Serrano, A. M., Espuny, M. R., et al. (2010). Impact of the presence of the
plant development selling rhizobacterium (PGPR) Chryseobacterium balustinum
Aur9 and salt stress within the sample of flavonoids exuded by soybean roots. Plant
Soil 328, 483–493. doi: 10.1007/s11104-009-0127-6
Dayan, F. E., Howell, J., and Weidenhamer, J. D. (2009). Dynamic root exudation
of sorgoleone and its in planta mechanism of motion. J. Exp. Bot. 60, 2107–2117.
doi: 10.1093/jxb/erp082
Demuner, A. J., Barbosa, L. C. A., Chinelatto, L. S., Reis, C., and Silva, A. A.
(2005). Sorption and persistence of sorgoleone in red-yellow latosol. Q. Nova
28, 451–455. doi: 10.1590/S0100-40422005000300016
Dhima, Ok. V., Vasilakoglou, I. B., Eleftherohorinos, I. G., and Lithourgidis, A. S.
(2006). Allelopathic potential of winter cereals and their cowl crop mulch impact
on grass weed suppression and corn improvement. Crop. Sci. 46, 345–352. doi:
10.2135/cropsci2005-Zero186
Dietz, M., Machill, S., Hoffmann, H. C., and Schmidtke, Ok. (2013). Inhibitory results
of Plantago lanceolata L. on soil N mineralization. Plant Soil 368, 445–458. doi:
10.1007/s11104-Zero12-1524-9
Ding, J., Solar, Y., Xiao, C. L., Shi, Ok., Zhou, Y. H., and Yu, J. Q. (2007).
Physiological foundation of completely different allelopathic reactions of cucumber and figleaf
gourd crops to cinnamic acid. J. Exp. Bot. 58, 3765–3773. doi: 10.1093/jxb/
erm227
Frontiers in Plant Science | www.frontiersin.org 12 November 2015 | Quantity 6 | Article 1020
Cheng and Cheng Plant Allelopathy Utility and Mechanisms
Dudai, N., Poljakoff-Mayber, A., Mayer, A. M., Putievsky, E., and Lerner, H. R.
(1999). Important oils as allelochemicals and their potential use as bioherbicides.
J. Chem. Ecol. 25, 1079–1089. doi: 10.1023/A:1020881825669
Einhellig, F. A. (1995). “Allelopathy-current standing and future targets,” in Allelopathy:
Organisms, Processes, and Purposes, eds A. Inderjit, Ok. M. M. Dakshini, and
F. A. Einhellig (Washington, DC: American Chemical Society Press), 1–24.
Fang, C., Li, Y., Li, C., Li, B., Ren, Y., Zheng, H., et al. (2015). Identification
and comparative Assessment of microRNAs in barnyardgrass (Echinochloa crusgalli) in response to rice allelopathy. Plant Cell Environ. 38, 1368–1381. doi:
10.1111/pce.12492
Fang, C., Zhuang, Y., Xu, T., Li, Y., Li, Y., and Lin, W. (2013). Modifications in rice
allelopathy and rhizosphere microflora by inhibiting rice phenylalanine
ammonia-lyase gene expression. J. Chem. Ecol. 39, 204–212. doi:
10.1007/s10886-013-Zero249-Four
Farhoudi, R., and Lee, D. J. (2013). Allelopathic results of barley extract (Hordeum
vulgare) on sucrose synthase exercise, lipid peroxidation and antioxidant
enzymatic actions of Hordeum spontoneum and Avena ludoviciana. Plant.
Natl. Sci. Ind. B 83, 447–452. doi: 10.1007/s40011-Zero12-0137-7
Farhoudi, R., Zangane, H. S., and Saeedipour, S. (2012). Allelopathical impact of
barley [Hordeum vulgare (L.) cv. Karon] on germination and lipid peroxidation
of wild mustard seedling. Res. Crop. 13, 467–471.
Farooq, M., Bajwa, A. A., Cheema, S. A., and Cheema, Z. A. (2013). Utility
of allelopathy in crop manufacturing. Int. J. Agric. Biol. 15, 1367–1378 doi:
10.1007/978-Three-642-30595-5_6
Farooq, M., Hussain, T., Wakeel, A., and Cheema, Z. A. (2014). Differential response
of maize and mungbean to tobacco allelopathy. Exp. Agric. 50, 611–624. doi:
10.1017/S0014479714000106
Farooq, M., Jabran, Ok., Cheema, Z. A., Wahid, A., and Siddique, Ok. H. (2011).
The function of allelopathy in agricultural pest administration. Pest. Manag. Sci. 67,
493–506. doi: 10.1002/ps.2091
Fernandez, C., Santonja, M., Gros, R., Monnier, Y., Chomel, M., Baldy, V., et
al. (2013). Allelochemicals of Pinus halepensis as drivers of biodiversity in
Mediterranean open mosaic habitats in the course of the colonization stage of secondary
succession. J. Chem. Ecol. 39, 298–311. doi: 10.1007/s10886-013-Zero239-6
Discipline, B., Jordan, F., and Osbourn, A. (2006). First encounters–deployment of
defence-related pure merchandise by crops. New Phytol. 172, 193–207. doi:
10.1111/j.1469-8137.2006.01863.x
Fragasso, M., Iannucci, A., and Papa, R. (2013). Durum wheat and allelopathy:
towards wheat breeding for pure weed administration. Entrance. Plant Sci. Four:375.
doi: 10.3389/fpls.2013.00375
Gao, L., and Li, B. (2004). The research of a specious invasive plant, water hyacinth
(Eichhornia crassipes): achievements and challenges. Chin. J. Plant Ecol. 28,
735–752.
Gealy, D. R., and Yan, W. (2012). Weed suppression potential of ‘Rondo’ and different
Indica rice germplasm strains. Weed Technol. 26, 517–524. doi: 10.1614/WT-D11-00141.1
Geng, G. D., Zhang, S. Q., and Cheng, Z. H. (2009). Results of completely different
allelochemicals on mineral components absorption of tomato root. China Veget. Four,
48–51.
Gimsing, A. L., Baelum, J., Dayan, F. E., Locke, M. A., Sejero, L. H., and Jacobsen, C.
S. (2009). Mineralization of the allelochemical sorgoleone in soil. Chemosphere
76, 1041–1047. doi: 10.1016/j.chemosphere.2009.04.Zero48
Gioria, M., and Osborne, B. A. (2014). Useful resource competitors in plant
invasions: rising patterns and analysis wants. Entrance. Plant Sci. 5:501.
doi: 10.3389/fpls.2014.00501
Gniazdowska, A., and Bogatek, R. (2005). Allelopathic interactions between crops.
Multi web site motion of allelochemicals. Acta Physiol. Plant 27, 395–407. doi:
10.1007/s11738-005-0017-Three
Golisz, A., Sugano, M., and Fujii, Y. (2008). Microarray expression profiling of
Arabidopsis thaliana L. in response to allelochemicals recognized in buckwheat.
J. Exp. Bot. 59, 3099–3109. doi: 10.1093/jxb/ern168
Golisz, A., Sugano, M., Hiradate, S., and Fujii, Y. (2011). Microarray Assessment of
Arabidopsis crops in response to allelochemical L-DOPA. Planta 233, 231–240.
doi: 10.1007/s00425-Zero10-1294-7
Gonzalez, V. M., Kazimir, J., Nimbal, C., Weston, L. A., and Cheniae, G. M. (1997).
Inhibition of a photosystem II electron switch response by the pure product
sorgoleone. J. Agric. Meals Chem. 45, 1415–1421. doi: 10.1021/jf960733w
Grana, E., Sotelo, T., Diaz-Tielas, C., Araniti, F., Krasuska, U., Bogatek, R., et al.
(2013). Citral induces auxin and ethylene-mediated malformations and arrests
cell division in Arabidopsis thaliana roots. J. Chem. Ecol. 39, 271–282. doi:
10.1007/s10886-013-Zero250-y
Guillon, M. (2003). Herbicidal Composition Comprising an Allelopathic Substance
and Methodology of use Thereof. European patent No 1110456. Nogueres, France:
European Patent Workplace.
Guo, H., Pei, X., Wan, F., and Cheng, H. (2011). Molecular cloning of allelopathy
associated genes and their relation to HHO in Eupatorium adenophorum. Mol. Biol.
Rep. 38, 4651–4656. doi: 10.1007/s11033-Zero10-0599-Eight
Gu, Y., Wang, P., and Kong, C. H. (2009). Urease, invertase, dehydrogenase and
polyphenoloxidase actions in paddy soil influenced by allelopathic rice selection.
Eur. J. Soil Biol. 45, 436–441. doi: 10.1016/j.ejsobi.2009.06.003
Hagan, D. L., Jose, S., and Lin, C. H. (2013). Allelopathic exudates of cogongrass
(Imperata cylindrica): implications for the efficiency of native pine savanna
plant species within the southeastern US. J. Chem. Ecol. 39, 312–322. doi:
10.1007/s10886-013-0241-z
Haider, G., Cheema, Z. A., Farooq, M., and Wahid, A. (2015). Efficiency and
nitrogen use of wheat cultivars in response to software of allelopathic crop
residues and three, Four-dimethylpyrazole phosphate. Int. J. Agric. Biol. 17, 261–270.
Hallak, A. M. G., Davide, L. C., and Souza, I. F. (1999). Results of sorghum (Sorghum
bicolor L.) root exudates on the cell cycle of the bean plant (Phaseolus vulgaris
L.) root. Genet. Mol. Biol. 22, 95–99. doi: 10.1590/S1415-47571999000100018
Han, X., Cheng, Z. H., Meng, H. W., Yang, X. L., and Ahmad, I. (2013). Allelopathic
impact of decomposed garlic (Allium Sativum L.) stalk on lettuce (L. Sativa Var.
Crispa L.). Pak. J. Bot. 45, 225–233.
Harun, M. A. Y. A., Robinson, R. W., Johnson, J., and Uddin, M. N.
(2014). Allelopathic potential of Chrysanthemoides monilifera subsp. monilifera
(boneseed): a novel weapon within the invasion processes. South Afric. J. Bot. 93,
157–166. doi: 10.1016/j.sajb.2014.04.Zero08
He, H. B., Wang, H. B., Fang, C. X., Lin, Z. H., Yu, Z. M., and Lin, W. X. (2012b).
Separation of allelopathy from useful resource competitors utilizing rice/barnyardgrass
mixed-cultures. PLoS ONE 7:e37201. doi: 10.1371/journal.pone.
0037201
He, H., Wang, H., Fang, C., Wu, H., Guo, X., Liu, C., et al. (2012a). Barnyard grass
stress up regulates the biosynthesis of phenolic compounds in allelopathic rice.
J. Plant Physiol. 169, 1747–1753. doi: 10.1016/j.jplph.2012.06.Zero18
Hejl, A. M., and Koster, Ok. L. (2004a). The allelochemical sorgoleone inhibits
root H+-ATPase and water uptake. J. Chem. Ecol. 30, 2181–2191. doi:
10.1023/B:JOEC.0000048782.87862.7f
Hejl, A. M., and Koster, Ok. L. (2004b). Juglone disrupts root plasma membrane
H
+-ATPase exercise and impairs water uptake, root respiration, and development in
soybean (Glycine max) and corn (Zea mays). J. Chem. Ecol. 30, 453–471. doi:
10.1023/B:JOEC.0000017988.20530.d5
Huang, L. F., Tune, L. X., Xia, X. J., Mao, W. H., Shi, Ok., Zhou, Y. H., et al.
(2013). Plant-soil feedbacks and soil illness: from mechanisms to software
in agriculture. J. Chem. Ecol. 39, 232–242. doi: 10.1007/s10886-013-0244-9
Iannucci, A., Fragasso, M., Platani, C., and Papa, R. (2013). Plant development and
phenolic compounds within the rhizosphere soil of wild oat (Avena fatua L.). Entrance.
Plant Sci. Four:509. doi: 10.3389/fpls.2013.00509
Ihsan, M. Z., Khaliq, A., Mahmood, A., Naeem, M., El-Nakhlawy, F., and Alghabari,
F. (2015). Discipline analysis of allelopathic plant extracts alongside herbicides on
weed administration indices and weed-crop regression Assessment in maize. Weed
Biol. Manag. 15, 78–86. doi: 10.1111/wbm.12070
Imatomi, M., Novaes, P., and Gualtieri, S. C. J. (2013). Interspecific variation in
the allelopathic potential of the household Myrtaceae. Acta Bot. Bras 27, 54–61. doi:
10.1590/S0102-33062013000100008
Inderjit, Callaway, R. M., and Vivanco, J. M. (2006). Can plant biochemistry
contribute to understanding of invasion ecology? Tendencies Plant Sci. 11, 574–580.
doi: 10.1016/j.tplants.2006.10.Zero04
Inderjit, and del Ethical, R. (1997). Is separating useful resource competitors from
allelopathy real looking? Bot. Rev. 63, 221–230.
Inderjit, and Nilsen, E. T. (2003). Bioassays and subject research for allelopathy in
terrestrial crops: progress and issues. Crit. Rev. Plant Sci. 22, 221–238. doi:
10.1080/713610857
Inderjit, Wardle, D. A., Karban, R., and Callaway, R. M. (2011). The ecosystem
and evolutionary contexts of allelopathy. Tendencies Ecol. Evol. 26, 655–662. doi:
10.1016/j.tree.2011.08.003
Iqbal, J., Cheema, Z. A., and An, M. (2007). Intercropping of subject crops in cotton
for the administration of purple nutsedge (Cyperus rotundus L.). Plant Soil 300,
163–171. doi: 10.1007/s11104-Zero07-9400-Eight
Frontiers in Plant Science | www.frontiersin.org 13 November 2015 | Quantity 6 | Article 1020
Cheng and Cheng Plant Allelopathy Utility and Mechanisms
Jabran, Ok., Mahajan, G., Sardana, V., and Chauhan, B. S. (2015). Allelopathy
for weed management in agricultural techniques. Crop. Prot. 72, 57–65. doi:
10.1016/j.cropro.2015.03.Zero04
Jin, Z. H., Zhuang, Y. Y., Dai, S. G., and Li, T. L. (2003). Isolation and
identification of extracts of Eichhornia crassipes and their allelopathic results
on algae. B. Environ. Contam. Toxicol. 71, 1048–1052. doi: 10.1007/s00128-003-
0226-7
John, J., Shirmila, J., Sarada, S., and Anu, S. (2010). Function of Allelopathy in greens
crops manufacturing. Allelopathy J. 25, 275–311.
Kato-Noguchi, H., Ota, Ok., Kujime, H., and Ogawa, M. (2013). Results of
momilactone on the protein expression in Arabidopsis germination. Weed Biol.
Manag. 13, 19–23. doi: 10.1111/wbm.12005
Kaur, H., Inderjit, and Kaushik, S. (2005). Mobile proof of allelopathic
interference of benzoic acid to mustard (Brassica juncea L.) seedling development.
Plant Physiol. Biochem. 43, 77–81. doi: 10.1016/j.plaphy.2004.12.Zero07
Kekec, G., Mutlu, S., Alpsoy, L., Sakcali, M. S., and Atici, O. (2013). Genotoxic results
of catmint (Nepeta meyeri Benth.) important oils on some weed and crop crops.
Toxicol. Ind. Well being. 29, 504–513. doi: 10.1177/0748233712440135
Khanh, T. D., Chung, M. I., Xuan, T. D., and Tawata, S. (2005). The exploitation of
crop allelopathy in sustainable agricultural manufacturing. J. Agron Crop. Sci. 191,
172–184. doi: 10.1111/j.1439-037x.2005.00172.x
Khan, M. A., Cheng, Z. H., Xiao, X. M., Khan, A. R., and Ahmed, S. S.
(2011). Ultrastructural research of the inhibition impact in opposition to Phytophthora
capsici of root exudates collected from two garlic cultivars together with their
qualitative Assessment. Crop. Prot. 30, 1149–1155. doi: 10.1016/j.cropro.2011.
04.013
Kloepper, J. W., Leong, J., Teintze, M., and Schroth, M. N. (1980). Enhanced plant
development by siderophores produced by plant growth-promoting rhizobacteria.
Nature 286, 885–886. doi: 10.1038/286885a0
Kloepper, J. W., Ryu, C. M., and Zhang, S. (2004). Induced systemic resistance and
promotion of plant development by Bacillus spp. Phytopathology 94, 1259–1266. doi:
10.1094/PHYTO.2004.94.11.1259
Kong, C. H., Chen, X. H., Hu, F., and Zhang, S. Z. (2011). Breeding of commercially
acceptable allelopathic rice cultivars in China. Pest. Manag. Sci. 67, 1100–1106.
doi: 10.1002/ps.2154
Kong, C. H., and Hu, F. (2001). Allelopathy and its Utility. Beijing: Chinese language
agricultural press
Kong, C. H., Wang, P., Gu, Y., Xu, X. H., and Wang, M. L. (2008). Destiny and influence
on microorganisms of rice allelochemicals in paddy soil. J. Agric. Meals Chem. 56,
5043–5049. doi: 10.1021/jf8004096
Kremer, R. J. (2006). “The function of allelopathic micro organism in weed administration,”
in Allelochemicals: Organic Management of Plant Pathogens and Illnesses, eds X.
Inderjit and Ok. G. Mukerji (Dordrecht: Springer Netherlands Press), 143–155.
doi: 10.1007/1-4020-4447-X_7
Leao, P. N., Engene, N., Antunes, A., Gerwick, W. H., and Vasconcelos, V. (2012).
The chemical ecology of cyanobacteria. Nat. Prod. Rep. 29, 372–391. doi:
10.1039/c2np00Zero75j
Leslie, C. A., and Romani, R. J. (1988). Inhibition of ethylene biosynthesis by
salicylic acid. Plant Physiol. 88, 833–837. doi: 10.1104/pp.88.Three.833
Li, S. T., Zhou, J. M., Wang, H. Y., and Chen, X. Q. (2002). Analysis surveys of
allelopathy in crops. Chin. J. Eco. Agric. 10, 72–74.
Li, X. G., Ding, C. F., Hua, Ok., Zhang, T. L., Zhang, Y. N., Zhao, L., et al. (2014).
Soil illness of peanuts is attributable to modifications in soil microbes induced
by peanut root exudates somewhat than to direct allelopathy. Soil Biol. Biochem. 78,
149–159. doi: 10.1016/j.soilbio.2014.07.Zero19
Li, Y. P., Feng, Y. L., Chen, Y. J., and Tian, Y. H. (2015). Soil microbes alleviate
allelopathy of invasive crops. Sci. Bull. 60, 1083–1091. doi: 10.1007/s11434-Zero15-
0819-7
Li, Z. H., and Shen, Y. X. (2006). Allelopathic results of completely different varieties of
Medicago sativa weed regrowth in winter. Acta Pratac Sin. 15, 36–42.
Li, Z. H., Wang, Q., Ruan, X., Pan, C. D., and Jiang, D. A. (2010). Phenolics and
plant allelopathy. Molecules 15, 8933–8952. doi: 10.3390/molecules15128933
Liebman, M., and Dyck, E. (1993). Crop-rotation and intercropping methods for
weed administration. Ecol. Appl. Three, 92–122. doi: 10.2307/1941795
Lin, W. X. (2010). Impact of self-allelopathy on AOS of Casuarina equisetif olia forst
seedling. Fujian J. Agric. Sci. 25, 108–113.
Lin, W. X., He, H. Q., Guo, Y. C., Liang, Y. Y., and Chen, F. Y. (2001). Rice
allelopathy and its physiobiochemical traits. Chin. J. Appl. Ecol. 12,
871–875.
Lin, W. X., Kim, Ok. U., and Shin, D. H. (2000). Rice allelopathic potential and
its modes of motion on Barnyardgrass (Echinochloa crus-galli). Allelopathy J. 7,
215–224.
Liu, D. L., and Lovett, J. V. (1993). Biologically lively secondary metabolites of
barley. II. Phytotoxicity of barley allelochemicals. J. Chem. Ecol. 19, 2231–2244.
doi: 10.1007/BF00979660
Liu, X. F., and Hu, X. J. (2001). Results of allelochemical ferulic acid on endogenous
hormone stage of wheat seedling. Chin. J. Ecol. Agric. 9, 96–98.
Lv, W. G., Zhang, C. L., Yuan, F., and Peng, Y. (2002). Mechanism of allelochemicals
inhibiting steady cropping cucumber development. Sci. Agric. Sin. 35, 106–109.
Ma, Y. Q. (2005). Allelopathic research of widespread wheat (Triticum aestivum L.).
Weed Biol. Manag. 5, 93–104. doi: 10.1111/j.1445-6664.2005.00164.x
Macias, F. A., Marin, D., Oliveros-Bastidas, A., Castellano, D., Simonet, A. M.,
and Molinillo, J. M. (2005a). Construction-Exercise Relationships (SAR) research
of benzoxazinones, their degradation merchandise and analogues. phytotoxicity
on customary goal species (STS). J. Agric. Meals Chem. 53, 538–548. doi:
10.1021/jf0484071
Macias, F. A., Oliveros-Bastidas, A., Marin, D., Castellano, D., Simonet, A.
M., and Molinillo, J. M. (2005b). Degradation research on benzoxazinoids.
Soil degradation dynamics of (2R)-2-O-beta-D-glucopyranosyl-Four-hydroxy-
(2H)- 1,Four-benzoxazin-Three(4H)-one (DIBOA-Glc) and its degradation merchandise,
phytotoxic allelochemicals from Gramineae. J. Agric. Meals Chem. 53, 554–561.
doi: 10.1021/jf048702l
Macias, F. A., Marin, D., Oliveros-Bastidas, A., Varela, R. M., Simonet, A. M.,
Carrera, C., et al. (2003). Allelopathy as a brand new technique for sustainable ecosystems
improvement. Biol. Sci. Area 17, 18–23. doi: 10.2187/bss.17.18
Macias, F. A., Oliveros-Bastidas, A., Marin, D., Castellano, D., Simonet, A.
M., and Molinillo, J. M. (2004). Degradation research on benzoxazinoids.
Soil degradation dynamics of 2,Four-dihydroxy-7-methoxy-(2H)-1,Four-benzoxazin3(4H)-one (DIMBOA) and its degradation merchandise, phytotoxic allelochemicals
from gramineae. J. Agric. Meals Chem. 52, 6402–6413. doi: 10.1021/jf0488514
Mahmood, A., Cheema, Z. A., Mushtaq, M. N., and Farooq, M. (2013). Maizesorghum intercropping techniques for purple nutsedge administration. Arch. Agron
Soil Sci. 59, 1279–1288. doi: 10.1080/03650340.2012.704547
Mahmoud, S. S., and Croteau, R. B. (2002). Methods for transgenic manipulation
of monoterpene biosynthesis in crops. Tendencies Plant Sci. 7, 366–373. doi:
10.1016/S1360-1385(02)02303-Eight
Mallik, A. U. (2003). Conifer regeneration issues in boreal and temperate
forests with ericaceous understory: Function of disturbance, seedbed limitation,
and keystone species change. Crit. Rev. Plant Sci. 22, 341–366. doi:
10.1080/713610860
Maqbool, N., Wahid, A., Farooq, M., Cheema, Z. A., and Siddique, Ok. H. M. (2013).
“Allelopathy and abiotic stress interplay in crop crops,” in Allelopathy, eds
Z. A. Cheema, M. Farooq, and A. Wahid (Berlin: Springer Berlin Heidelberg),
451–468. doi: 10.1007/978-Three-642-30595-5_19
Meazza, G., Scheffler, B. E., Tellez, M. R., Rimando, A. M., Romagni, J. G.,
Duke, S. O., et al. (2002). The inhibitory exercise of pure merchandise on
plant p-hydroxyphenylpyruvate dioxygenase. Phytochemistry 60, 281–288. doi:
10.1016/S0031-9422(02)00121-Eight
Mishra, S., Mishra, A., Chauhan, P. S., Mishra, S. Ok., Kumari, M., Niranjan, A., et
al. (2012). Pseudomonas putida NBRIC19 dihydrolipoamide succinyltransferase
(SucB) gene controls degradation of poisonous allelochemicals produced by
Parthenium hysterophorus. J. Appl. Microbiol. 112, 793–808. doi: 10.1111/j.1365-
2672.2012.05256.x
Mishra, S., and Nautiyal, C. S. (2012). Decreasing the allelopathic impact of Parthenium
hysterophorus L. on wheat (Triticum aestivum L.) by Pseudomonas putida. Plant
Progress Regul. 66, 155–165. doi: 10.1007/s10725-011-9639-1
Mishra, S., Upadhyay, R. S., and Nautiyal, C. S. (2013). Unravelling the
helpful function of microbial contributors in lowering the allelopathic results of
weeds. Appl. Microbiol. Biotechnol. 97, 5659–5668. doi: 10.1007/s00253-013-
4885-y
Miyake, Y. (2009). Plant Progress Inhibitor. Japan patent No 2009274970. Tokyo:
Japan Patent Workplace.
Mohney, B. Ok., Matz, T., Lamoreaux, J., Wilcox, D. S., Gimsing, A. L., Mayer, P., et
al. (2009). In situ silicone tube microextraction: a brand new technique for undisturbed
sampling of root-exuded thiophenes from marigold (Tagetes erecta L.) in soil. J.
Chem. Ecol. 35, 1279–1287. doi: 10.1007/s10886-009-9711-Eight
Molisch, H. (1937). Der Einfluss Einer Pflanze Auf Die Andere-allelopathie. Jena:
Fischer.
Frontiers in Plant Science | www.frontiersin.org 14 November 2015 | Quantity 6 | Article 1020
Cheng and Cheng Plant Allelopathy Utility and Mechanisms
Moraes, P. V. D., Agostinetto, D., Vignolo, G. Ok., Santos, L. S., and Panozzo, L. E.
(2009). Cowl crop administration and weed management in corn. Planta Daninha 27,
289–296. doi: 10.1590/S0100-83582009000200011
Narwal, S. S. (2000). Weed administration in rice: wheat rotation by allelopathy. Crit.
Rev. Plant Sci. 19, 249–266. doi: 10.1016/S0735-2689(00)80004-Zero
Nawaz, A., Farooq, M., Cheema, S. A., and Cheema, Z. A. (2014). “Function of
allelopathy in weed administration,” in Current Advances in Weed Administration, eds
B. S. Chauhan and G. Mahajan (New York: Springer-Verlag Press), 39–62.
Nishida, N., Tamotsu, S., Nagata, N., Saito, C., and Sakai, A. (2005). Allelopathic
results of risky monoterpenoids produced by Salvia leucophylla: Inhibition
of cell proliferation and DNA synthesis within the root apical meristem of Brassica
campestris seedlings. J. Chem. Ecol. 31, 1187–1203. doi: 10.1007/s10886-005-
4256-y
Odeyemi, I. S., Afolami, S. O., and Adigun, J. A. (2013). Plant parasitic
nematode relative abundance and inhabitants suppression below
Chromolaena odorata (Asteraceae) fallow. Int. J. Pest. Handle 59, 79–88.
doi: 10.1080/09670874.2013.766776
Ogata, T., Hamachi, M., and Nishi, Ok. (2008). Natural Herbicide for Paddy Discipline.
Japan patent No 2008050329. Tokyo: Japan Patent Workplace.
Pawlowski, A., Kaltchuk-Santos, E., Zini, C. A., Caramao, E. B., and Soares,
G. L. G. (2012). Important oils of Schinus terebinthifolius and S. molle
(Anacardiaceae): Mitodepressive and aneugenic inducers in onion and lettuce
root meristems. South Afric. J. Bot. 80, 96–103. doi: 10.1016/j.sajb.2012.
03.003
Pearse, I. S., Bastow, J. L., and Tsang, A. (2014). Radish introduction impacts soil
biota and has a constructive influence on the expansion of a local plant. Oecologia 174,
471–478. doi: 10.1007/s00442-013-2779-Four
Peng, S. L., Wen, J., and Guo, Q. F. (2004). Mechanism and lively selection of
allelochemicals. Acta Bot. Sin. 46, 757–766.
Poonpaiboonpipat, T., Pangnakorn, U., Suvunnamek, U., Teerarak, M.,
Charoenying, P., and Laosinwattana, C. (2013). Phytotoxic results of
important oil from Cymbopogon citratus and its physiological mechanisms
on barnyardgrass (Echinochloa crus-galli). Ind. Crop. Prod. 41, 403–407. doi:
10.1016/j.indcrop.2012.04.Zero57
Rasmussen, J. A., Hejl, A. M., Einhellig, F. A., and Thomas, J. A. (1992). Sorgoleone
from root exudate inhibits mitochondrial features. J. Chem. Ecol. 18, 197–207.
doi: 10.1007/BF00993753
Reeves, D. W., Value, A. J., and Patterson, M. G. (2005). Analysis of three winter
cereals for weed management in conservation-tillage nontransgenic cotton. Weed
Technol. 19, 731–736. doi: 10.1614/WT-04-245R1.1
Rice, E. L. (1974). Allelopathy. New York: Tutorial Press
Rice, E. L. (1984). Allelopathy, 2nd ed. New York: Tutorial Press
Sanchez-Moreiras, A. M., De La Pena, T. C., and Reigosa, M. J. (2008).
The pure compound benzoxazolin-2(3H)-one selectively retards cell
cycle in lettuce root meristems. Phytochemistry 69, 2172–2179. doi:
10.1016/j.phytochem.2008.05.Zero14
Schulz, M., Marocco, A., Tabaglio, V., Macias, F. A., and Molinillo, J. M.
(2013). Benzoxazinoids in rye allelopathy—from discovery to software in
sustainable weed management and natural farming. J. Chem. Ecol. 39, 154–174. doi:
10.1007/s10886-013-0235-x
Shao, J., Wu, Z., Yu, G., Peng, X., and Li, R. (2009). Allelopathic mechanism
of pyrogallol to Microcystis aeruginosa PCC7806 (Cyanobacteria): from views
of gene expression and antioxidant system. Chemosphere 75, 924–928. doi:
10.1016/j.chemosphere.2009.01.Zero21
Shearer, T., Rasher, D., Snell, T., and Hay, M. (2012). Gene expression patterns of the
coralAcropora millepora in response to contact with macroalgae. Coral. Reefs. 31,
1177–1192. doi: 10.1007/s00338-Zero12-0943-7
Silva, R. M. G., Brante, R. T., Santos, V. H. M., Mecina, G. F., and Silva, L. P. (2014).
Phytotoxicity of ethanolic extract of turnip leaves (Raphanus Sativus L.). Biosci.
J. 30, 891–902.
Silva, R. M. G., Brigatti, J. G. F., Santos, V. H. M., Mecina, G. F., and Silva, L. P.
(2013). Allelopathic impact of the peel of espresso fruit. Sci. Hortic. Am. 158, 39–44.
doi: 10.1016/j.scienta.2013.04.Zero28
Singh, H. P., Batish, D. R., and Kohli, R. Ok. (1999). Autotoxicity: idea,
organisms, and ecological significance. Crit. Rev. Plant Sci. 18, 757–772. doi:
10.1080/07352689991309478
Singh, H. P., Batish, D. R., and Kohli, R. Ok. (2003). Allelopathic interactions and
allelochemicals: new prospects for sustainable weed administration. Crit. Rev.
Plant Sci. 22, 239–311. doi: 10.1080/713610858
Soltys, D., Rudzinska-Langwald, A., Gniazdowska, A., Wisniewska, A., and
Bogatek, R. (2012). Inhibition of tomato (Solanum lycopersicum L.) root development
by cyanamide is because of altered cell division, phytohormone stability and
expansin gene expression. Planta 236, 1629–1638. doi: 10.1007/s00425-Zero12-
1722-y
Stinson, Ok. A., Campbell, S. A., Powell, J. R., Wolfe, B. E., Callaway, R. M.,
Thelen, G. C., et al. (2006). Invasive plant suppresses the expansion of native
tree seedlings by disrupting belowground mutualisms. PLoS Biol. Four:e140. doi:
10.1371/journal.pbio.0040140
Solar, X. M., Lu, Z. Y., Liu, B. Y., Zhou, Q. H., Zhang, Y. Y., and Wu, Z. B. (2014).
Allelopathic results of pyrogallic acid secreted by submerged macrophytes on
Microcystis aeruginosa: function of ROS technology. Allelopathy J. 33, 121–129.
Sunar, S., Yildirim, N., Aksakal, O., and Agar, G. (2013). Dedication of the
genotoxic results of Convolvulus arvensis extracts on corn (Zea mays L.) seeds.
Toxicol. Ind. Well being. 29, 449–459. doi: 10.1177/0748233712436644
Sunmonu, T. O., and Van Staden, J. (2014). Phytotoxicity analysis of six fastgrowing tree species in South Africa. South Afric. J. Bot. 90, 101–106. doi:
10.1016/j.sajb.2013.10.Zero10
Tabaglio, V., Gavazzi, C., Schulz, M., and Marocco, A. (2008). Different weed
management utilizing the allelopathic impact of pure benzoxazinoids from rye mulch.
Agron Maintain Dev. 28, 397–401. doi: 10.1051/agro:2008004
Tanrisever, N., Fronczek, F. R., Fischer, N. H., and Williamson, G. B. (1987).
Ceratolin and different flavonoids from Ceratiola ericoides. Phytochemistry 26,
175–179.
Teerarak, M., Charoenying, P., and Laosinwattana, C. (2012). Physiological and
mobile mechanisms of pure herbicide useful resource from Aglaia odorata Lour.
on bioassay crops. Acta Physiol. Plant 34, 1277–1285. doi: 10.1007/s11738-011-
0923-5
Uddin, M. R., Park, Ok. W., Han, S. M., Pyon, J. Y., and Park, S. U. (2012). Results of
sorgoleone allelochemical on chlorophyll fluorescence and development inhibition in
weeds. Allelopathy J. 30, 61–70.
Uddin, M. R., Park, S. U., Dayan, F. E., and Pyon, J. Y. (2014). Herbicidal exercise of
formulated sorgoleone, a pure product of sorghum root exudate. Pest. Manag.
Sci. 70, 252–257. doi: 10.1002/ps.3550
Understrup, A. G., Ravnskov, S., Hansen, H. C., and Fomsgaard, I. S. (2005).
Biotransformation of 2-benzoxazolinone to 2-amino-(3H)-phenoxazin-Three-
one and 2-acetylamino-(3H)-phenoxazin-Three-one in soil. J. Chem. Ecol. 31,
1205–1222. doi: 10.1007/s10886-005-4257-x
van Loon, L. C. (2007). Plant responses to plant growth-promoting rhizobacteria.
Eur. J. Plant Pathol. 119, 243–254. doi: 10.1007/s10658-Zero07-9165-1
Vaughn, S. F., and Berhow, M. A. (1999). Allelochemicals remoted from tissues of the
invasive weed garlic mustard (Alliaria petiolata). J. Chem. Ecol. 25, 2495–2504.
doi: 10.1023/A:1020874124645
Wang, C. M., Chen, H. T., Li, T. C., Weng, J. H., Jhan, Y. L., Lin, S. X., et al.
(2014). The function of pentacyclic triterpenoids within the allelopathic results ofAlstonia
scholaris. J. Chem. Ecol. 40, 90–98. doi: 10.1007/s10886-013-0376-y
Wang, C. M., Jhan, Y. L., Yen, L. S., Su, Y. H., Chang, C. C., Wu, Y. Y., et al. (2013a).
The allelochemicals of litchi leaf and its potential as pure herbicide in weed
management. Allelopathy J. 32, 157–173.
Wang, M., Wu, C., Cheng, Z., and Meng, H. (2015). Progress and physiological
modifications in constantly cropped eggplant (Solanum melongena L.) upon relay
intercropping with garlic (Allium sativum L.). Entrance. Plant Sci. 6:262. doi:
10.3389/fpls.2015.00262
Wang, P., Kong, C. H., Hu, F., and Xu, X. H. (2007). Allantoin concerned in species
interactions with rice and different organisms in paddy soil. Plant Soil 296, 43–51.
doi: 10.1007/s11104-Zero07-9288-Three
Wang, P., Zhang, X. Y., and Kong, C. H. (2013b). The response of allelopathic
rice development and microbial suggestions to barnyardgrass infestation in a paddy
subject experiment. Eur. J. Soil Biol. 56, 26–32. doi: 10.1016/j.ejsobi.2013.
01.Zero06
Weidenhamer, J. D. (2005). Biomimetic measurement of allelochemical dynamics
within the rhizosphere. J. Chem. Ecol. 31, 221–236. doi: 10.1007/s10886-005-1337-x
Weidenhamer, J. D., Boes, P. D., and Wilcox, D. S. (2009). Stable-phase root zone
extraction (SPRE): a brand new methodology for measurement of allelochemical
dynamics in soil. Plant Soil 322, 177–186. doi: 10.1007/s11104-009-9905-Four
Weidenhamer, J. D., Mohney, B. Ok., Shihada, N., and Rupasinghe, M. (2014). Spatial
and temporal dynamics of root exudation: how necessary is heterogeneity in
allelopathic interactions? J. Chem. Ecol. 40, 940–952. doi: 10.1007/s10886-Zero14-
Zero483-Four
Frontiers in Plant Science | www.frontiersin.org 15 November 2015 | Quantity 6 | Article 1020
Cheng and Cheng Plant Allelopathy Utility and Mechanisms
Weir, T. L., Park, S. W., and Vivanco, J. M. (2004). Biochemical and physiological
mechanisms mediated by allelochemicals. Curr. Opin. Plant Biol. 7, 472–479.
doi: 10.1016/j.pbi.2004.05.Zero07
Weston, L. A., and Duke, S. O. (2003). Weed and crop allelopathy. Crit. Rev. Plant
Sci. 22, 367–389. doi: 10.1080/713610861
Weston, L. A., and Mathesius, U. (2013). Flavonoids: their construction, biosynthesis
and function within the rhizosphere, together with allelopathy. J. Chem. Ecol. 39, 283–297.
doi: 10.1007/s10886-013-0248-5
Wezel, A., Casagrande, M., Celette, F., Vian, J. F., Ferrer, A., and Peigne, J. (2014).
Agroecological practices for sustainable agriculture. A overview. Agron. Maintain.
Dev. 34, 1–20. doi: 10.1007/s13593-013-0180-7
Wink, M., and Latzbruning, B. (1995). “Allelopathic properties of alkaloids and
different natural-products-possible modes of motion,” in Allelopathy: Organisms,
Processes, and Purposes, eds A. Inderjit, Ok. M. M. Dakshini, and F. A.
Einhellig (Washington, DC: American Chemical Society Press), 117–126.
Wortman, S. E., Drijber, R. A., Francis, C. A., and Lindquist, J. L. (2013).
Arable weeds, cowl crops, and tillage drive soil microbial group
composition in natural cropping techniques. Appl. Soil Ecol. 72, 232–241. doi:
10.1016/j.apsoil.2013.07.Zero14
Wu, F. Z., Pan, Ok., Ma, F. M., and Wang, X. D. (2004). Results of ciunamic acid on
photosynthesis and cell ultrastructure of cucumber seedlings. Acta Hortic Sin.
31, 183–188.
Wu, Z., Yang, L., Wang, R., Zhang, Y., Shang, Q., Wang, L., et al. (2015). In vitro research
of the expansion, improvement and pathogenicity responses of Fusarium oxysporum
to phthalic acid, an autotoxin from Lanzhou lily. World J. Microbiol. Biotechnol.
31, 1227–1234. doi: 10.1007/s11274-Zero15-1872-Eight
Xiong, J., Lin, W., Zhou, J., Wu, M., Chen, X., He, H., et al. (2005). Allelopathy and
assets competitors of rice below completely different nitrogen provides. Chin. J. Appl.
Ecol. 16, 885–889.
Xuan, T. D., Shinkichi, T., Khanh, T. D., and Min, C. I. (2005). Organic management
of weeds and plant pathogens in paddy rice by exploiting plant allelopathy: an
overview. Crop Prot 24, 197–206. doi: 10.1016/j.cropro.2004.08.Zero04
Yan, W. G., and McClung, A. M. (2010). ‘Rondo,’ a long-grain indica rice
with resistances to a number of illnesses. J. Plant Regist. Four, 131–136. doi:
10.3198/jpr2009.07.0404crc
Yang, G. Q., Wan, F. H., Liu, W. X., and Guo, J. Y. (2008). Affect of two
allelochemicals from Ageratina adenophora Sprengel on ABA, IAA, and ZR
contents in roots of upland rice seedlings. Allelopathy J. 21, 253–262.
Yang, Q. H., Ye, W. H., Liao, F. L., and Yin, X. J. (2005). Results of allelochemicals
on seed germination. Chin. J. Ecol. 24, 1459–1465.
Ye, C., Zhang, M., and Yang, Y. (2013). “Photosynthetic inhibition on the microalga
Phaeodactylum tricornutum by the dried macroalga Gracilaria tenuistipitata,” in
Vitality and Atmosphere Supplies, eds X. F. Tang, Y. Wu, Y. Yao, and Z. Z. Zhang
(Beijin: China Tutorial Journal Digital Publishing Home), 725–731. doi:
10.4028/www.scientific.web/msf.743-744.725
Yildirim, E., and Guvenc, I. (2005). Intercropping primarily based on cauliflower: extra
productive, worthwhile and extremely sustainable. Eur. J. Agron. 22, 11–18. doi:
10.1016/j.eja.2003.11.003
Yu, J. H., Zhang, Y., Niu, C. X., and Li, J. J. (2006). Results of two sorts of
allelochemicals on photosynthesis and chlorophyll fluorescence parameters of
Solanum melongena L. seedlings. Chin. J. Appl. Ecol. 17, 1629–1632.
Yu, J. Q., and Matsui, Y. (1997). Results of root exudates of cucumber (Cucumis
sativus) and allelochemicals on ion uptake by cucumber seedlings. J. Chem. Ecol.
23, 817–827. doi: 10.1023/B:JOEC.0000006413.98507.55
Yu, J. Q., Ye, S. F., Zhang, M. F., and Hu, W. H. (2003). Results of root exudates
and aqueous root extracts of cucumber (Cucumis sativus) and allelochemicals,
on photosynthesis and antioxidant enzymes in cucumber. Biochem. Syst. Ecol.
31, 129–139. doi: 10.1016/S0305-1978(02)00150-Three
Yuan, G. L., Ma, R. X., Liu, X. F., and Solar, S. S. (1998). Impact of allelochemicals on
nitrogen absorption of wheat seeding. Chin. J. Eco. Agric. 39–41.
Zeng, R. (2008). “Allelopathy in Chinese language historic and trendy agriculture,” in
Allelopathy in Sustainable Agriculture and Forestry, eds R. Zeng, A. Mallik and
S. Luo (New York: Springer New York Press), 39–59. doi: 10.1007/978-Zero-387-
77337-7_3
Zeng, R. S. (2014). Allelopathy—the answer is oblique. J. Chem. Ecol. 40, 515–516.
doi: 10.1007/s10886-Zero14-0464-7
Zeng, R. S., Luo, S. M., Shi, Y. H., Shi, M. B., and Tu, C. Y. (2001). Physiological
and biochemical mechanism of allelopathy of secalonic acid F on increased crops.
Agron. J. 93, 72–79. doi: 10.2134/agronj2001.93172x
Zeng, R. S., Mallik, A. U., and Luo, S. M. (2008). Allelopathy in Sustainable
Agriculture and Forestry. New York: Springer Press doi: 10.1007/978-Zero-387-
77337-7
Zhang, H., Mallik, A., and Zeng, R. S. (2013a). Management of Panama illness of banana
by rotating and intercropping with Chinese language chive (Allium tuberosum Rottler):
function of plant volatiles. J. Chem. Ecol. 39, 243–252. doi: 10.1007/s10886-013-
Zero243-x
Zhang, W., Ma, Y., Wang, Z., Ye, X., and Shui, J. (2013b). Some soybean cultivars
have capacity to induce germination of sunflower broomrape. PLoS ONE Eight:e59715.
doi: 10.1371/journal.pone.0059715
Zheng, Y. L., Feng, Y. L., Zhang, L. Ok., Callaway, R. M., Valiente-Banuet, A., Luo,
D. Q., et al. (2015). Integrating novel chemical weapons and evolutionarily
elevated aggressive capacity in success of a tropical invader. New Phytol. 205,
1350–1359. doi: 10.1111/nph.13135
Zhou, B., Kong, C. H., Li, Y. H., Wang, P., and Xu, X. H. (2013). Crabgrass
(Digitaria sanguinalis) allelochemicals that intervene with crop development and
the soil microbial group. J. Agric. Meals Chem. 61, 5310–5317. doi:
10.1021/jf401605g
Zhou, Ok., Wang, Z. F., Hao, F. G., and Guo, W. M. (2010). Results of aquatic
extracts from completely different elements and rhizospheric soil of chrysanthemum on the
rooting of stem cuttings of the identical species. Acta Bot. Bor. Occid. Sin.
762–768.
Zhou, Y. L., Wang, Y., Li, J. Y., and Xue, Y. J. (2011). Allelopathy of garlic root
exudates. Chin. J. Appl. Ecol. 22, 1368–1372.
Zuo, S. P., Liu, G. B., and Li, M. (2012a). Genetic foundation of allelopathic potential of
winter wheat primarily based on the angle of quantitative trait locus. Discipline Crop. Res.
135, 67–73. doi: 10.1016/j.fcr.2012.07.005
Zuo, S. P., Ma, Y. Q., and Ye, L. T. (2012b). In vitro Assessment of allelopathic results
of wheat on potato. Allelopathy J. 30, 1–10.
Zuo, S. P., Li, X. W., Ma, Y. Q., and Yang, S. Y. (2014). Soil microbes are linked
to the allelopathic potential of completely different wheat genotypes. Plant Soil 378, 49–58.
doi: 10.1007/s11104-013-2020-6
Battle of Curiosity Assertion: The authors declare that the analysis was
performed within the absence of any industrial or monetary relationships that would
be construed as a possible battle of curiosity.
Copyright © 2015 Cheng and Cheng. That is an open-access article distributed below
the phrases of the Artistic Commons Attribution License (CC BY). The use, distribution
or replica in different boards is permitted, supplied the unique writer(s) or
licensor are credited and that the unique publication on this journal is cited, in
accordance with accepted educational apply. No use, distribution or replica is
permitted which doesn’t adjust to these phrases.
Frontiers in Plant Science | www.frontiersin.org 16 November 2015 | Quantity 6 | Article 1020

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