Mineralization of the allelochemical sorgoleone in soil

Gimsing, Anne Louise; Bælum, Jacob; Dayan, Franck E.; Locke, Martin A.; Sejerø, Lisbeth Hanefeld; Jacobsen, Carsten Suhr

doi:10.1016/j.chemosphere.2009.04.048

Cited by 46 publications

(33 citation statements)

References 31 publications

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“…Measured half-lives of benzylglucosinolate range from 6 hours to 9 days (Gimsing et al, 2006(Gimsing et al, , 2007; for 2-benzoxazolinone from 12 h to 30 days (Macías et al, 2004;Understrup et al, 2005); and for p-coumaric acid from 5 to 30 days (Blum et al, 1994;Pue et al, 1995). Factors that contribute to this variation include different degradation capabilities of microbial communities in different soil samples, abiotic soil characteristics such as pH (Gimsing et al, 2007;Johansen et al, 2007), the starting concentration of the allelochemical (Understrup et al, 2005;Kong et al, 2007;Gimsing et al, 2009), and the identities and concentrations of other organic compounds present in the soil (Blum et al, 1993;Pue et al, 1995;Blum, 1998;Macías et al, 2004). Half-lives are often modeled by using first-order kinetics, which implicitly states that the half-life is independent of starting concentration.…”

Section: Microbial Protection From Allelopathymentioning

confidence: 99%

Microbes as Targets and Mediators of Allelopathy in Plants

2012

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Studies of allelopathy in terrestrial systems have experienced tremendous growth as interest has risen in describing biochemical mechanisms responsible for structuring plant communities, determining agricultural and forest productivity, and explaining invasive behaviors in introduced organisms. While early criticisms of allelopathy involved issues with allelochemical production, stability, and degradation in soils, an understanding of the chemical ecology of soils and its microbial inhabitants has been increasingly incorporated in studies of allelopathy, and recognized as an essential predictor of the outcome of allelopathic interactions between plants. Microbes can mediate interactions in a number of ways with both positive and negative outcomes for surrounding plants and plant communities. In this review, we examine cases where soil microbes are the target of allelopathic plants leading to indirect effects on competing plants, provide examples where microbes play either a protective effect on plants against allelopathic competitors or enhance allelopathic effects, and we provide examples where soil microbial communities have changed through time in response to allelopathic plants with known or potential effects on plant communities. We focus primarily on interactions involving wild plants in natural systems, using case studies of some of the world's most notorious invasive plants, but we also provide selected examples from agriculturally managed systems. Allelopathic interactions between plants cannot be fully understood without considering microbial participants, and we conclude with suggestions for future research. Allelopathy and Soil MicrobesAllelopathy, generally, is considered as a form of negative chemical communication between organisms, whereby one participant (the donor) in an interaction produces a compound(s) that is released in the environment in ecologically relevant quantities that negatively impacts the fitness of other participants (the receivers); the effect presumably benefits fitness of the donor. While the concept of allelopathy extends back to at least Theophrastus in the third century B.C., who invoked this phenomenon as an explanatory mechanism of plant growth, abundance, or community structure in natural systems, the concept has fluctuated in popularity over time (see Willis, 2007 for review). Allelopathy often has been subjected to criticisms of ecological relevance that other phenomena, such as resource competition, have not, thus explaining why it has fallen out of favor during certain time periods. However, studies of allelopathy in terrestrial systems have experienced a tremendous "rebirth" in the last 20 years as interest has risen in describing biochemical mechanisms responsible for structuring plant communities, determining agricultural and forest productivity, and explaining invasive behaviors in introduced organisms. More rigorous observational and experimental approaches, along with better analytical techniques, have

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Section: Microbial Protection From Allelopathymentioning

confidence: 99%

Microbes as Targets and Mediators of Allelopathy in Plants

2012

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“…Although this compound is technically challenging to detect in rhizospheres of soil-grown plants (Weidenhamer 2005), previous studies have suggested that genotypespecific differences in sorghum root exudates may affect soil microbial communities (Kipe-Nolt et al 1985;Funnell-Harris et al 2008). The turnover of applied sorgoleone to native soils indicated that microorganisms utilize this compound as an energy source, which suggests a possible mechanism of how sorgoleone may influence soil microbial communities (Gimsing et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Soil and root populations of fluorescent Pseudomonas spp. associated with seedlings and field-grown plants are affected by sorghum genotype

2010

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Sorghum [Sorghum bicolor (L.) Moench] is valued for bioenergy, feed and food. Potential of sorghum genotypes to support differing populations of root-and soil-associated fluorescent Pseudomonas spp. or Fusarium spp., in two soils, was assessed. Culturable pseudomonads were enumerated from roots and soil of sorghum (Redlan and RTx433) and wheat (Lewjain) seedlings repeatedly grown in cycled soils in the growth chamber. Pseudomonads and Fusarium spp. were assessed from roots and soil of field-grown sorghum along with biological control traits hydrogen cyanide (HCN) and 2,4-diacetylphlorogluconol (phl) production. After four 4-week cycles, soil associated with Redlan seedlings had greater numbers of fluorescent pseudomonads than Lewjain. In dryland field conditions, RTx433 roots had greater numbers of pseudomonads than Redlan before anthesis but similar numbers after. There were no differences in numbers of pseudomonads from dryland soil or roots or soil of irrigated plants. Percentages of HCN-producing root isolates and phl soil isolates declined on irrigated Redlan plants, but percentages of HCN-producers increased in dryland conditions. Redlan roots had greater percentages of Fusarium isolates in the Gibberella fujikuroi complex. Results indicated that sorghum genotype affected rootassociated populations of fluorescent Pseudomonas spp. and Fusarium spp. across soil environments.

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“…Weston and Czarnota (2001), studying the soil persistence of sorgoleone, verified that its recovery from an artificially impregnated soil declined during a period of 42 days, being detectable even after 7 weeks. Contradictory results were found by Gimsing et al (2009) when studying the mineralisation of sorgoleone in four soils (two from North America and two from Denmark). These authors verified a complete degradation into CO 2 in all soils tested, and the mineralisation kinetics indicated that microorganisms in American soils use sorgoleone as a source of energy.…”

Section: Fate Of Allelochemicals In Soilmentioning

confidence: 85%

Allelopathy, an alternative tool to improve cropping systems. A review

Albuquerque

Santos

Lima

et al. 2010

Agronomy Sust. Developm.

173

122

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-Known since ancient times, the phenomenon of allelopathy has recently received greater attention from researchers and farmers worldwide. Crop failures and low yields caused by the reseeding, overseeding, crop rotation and replanting of fruit trees in orchards are believed to be caused by allelopathic activity. Moreover, the expensive and environmentally impacting herbicides for weed control have motivated studies directed at developing cheaper, environmentally-friendly alternatives. Despite the difficulties in separating chemical interference from other mechanisms, more modern approaches have produced consistent and conclusive data on this topic. The release and dynamics of allelochemicals in the soil are discussed herein. Examples of allelopathic crops, the allelochemicals produced and their uses in cropping systems are also presented along with current research trends regarding allelopathy. allelopathy / chemical interference / agriculture / potential use

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Mineralization of the allelochemical sorgoleone in soil

Cited by 46 publications

References 31 publications

Microbes as Targets and Mediators of Allelopathy in Plants

Microbes as Targets and Mediators of Allelopathy in Plants

Soil and root populations of fluorescent Pseudomonas spp. associated with seedlings and field-grown plants are affected by sorghum genotype

Allelopathy, an alternative tool to improve cropping systems. A review

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