Plant community effects on the diversity and pathogen suppressive activity of soil streptomycetes

Bakker, Matthew G.; Glover, J.; John, G.; Kinkel, Linda L.

doi:10.1016/j.apsoil.2010.06.003

Cited by 58 publications

(39 citation statements)

References 57 publications

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“…Deeper understanding of the diverse roles of antibiotics in species interactions in soil, the dynamics of antibiotic inhibition in natural habitats and especially the factors that may determine the potential for a coevolutionary arms race vs coevolutionary differentiation are crucial for understanding the long-term trajectories of antibiotic-producing microbes in soil. Recent work suggests the potential for soil edaphic characteristics, nutrient availability or nutrient diversity in soil, physical environmental stress and phylogeny to predict microbial inhibitory activities and coevolutionary interactions in soil populations (Schlatter et al, 2009;Bakker et al, 2010;Kinkel et al, 2011;Bailey and Kassen, 2012;Otto-Hanson et al, 2013). More detailed understanding of the precise roles of these factors in mediating microbial species interactions and coevolution in soil will contribute significantly to the search for novel antibiotic biochemistries, to enhanced insight into the maintenance of antibiotic resistance genes in environmental microbes and to management of disease suppressive activity of indigenous soil microbes (Martinez et al, 2011;Kinkel et al, 2011;Kinkel et al, 2012 …”

Section: Resistance Interactions Among Sympatric and Allopatric Isolamentioning

confidence: 99%

Sympatric inhibition and niche differentiation suggest alternative coevolutionary trajectories among Streptomycetes

et al. 2013

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Soil bacteria produce a diverse array of antibiotics, yet our understanding of the specific roles of antibiotics in the ecological and evolutionary dynamics of microbial interactions in natural habitats remains limited. Here, we show a significant role for antibiotics in mediating antagonistic interactions and nutrient competition among locally coexisting Streptomycete populations from soil. We found that antibiotic inhibition is significantly more intense among sympatric than allopatric Streptomycete populations, indicating local selection for inhibitory phenotypes. For sympatric but not allopatric populations, antibiotic inhibition is significantly positively correlated with niche overlap, indicating that inhibition is targeted toward bacteria that pose the greatest competitive threat. Our results support the hypothesis that antibiotics serve as weapons in mediating local microbial interactions in soil and suggest that coevolutionary niche displacement may reduce the likelihood of an antibiotic arms race. Further insight into the diverse roles of antibiotics in microbial ecology and evolution has significant implications for understanding the persistence of antibiotic inhibitory and resistance phenotypes in environmental microbes, optimizing antibiotic drug discovery and developing strategies for managing microbial coevolutionary dynamics to enhance inhibitory phenotypes.

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Section: Resistance Interactions Among Sympatric and Allopatric Isolamentioning

confidence: 99%

Sympatric inhibition and niche differentiation suggest alternative coevolutionary trajectories among Streptomycetes

et al. 2013

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“…Many previous studies suggested that healthy plants exhibit higher soil microbial diversity compared to diseased plants (Bakker et al 2010;Brussaard et al 2007), while organic amendments could significantly improve microbial diversity. It has been reported that microbial diversity in the rhizosphere soils negatively correlated with occurrence of soil borne disease and positively correlated with the plant resistance to pathogens (Bailey and Lazarovits 2003;Bulluck and Ristaino 2002;Gamliel et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Molecular characterization of microbial communities in the rhizosphere soils and roots of diseased and healthy Panax notoginseng

Hao

Zeng

et al. 2015

Antonie van Leeuwenhoek

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Rhizosphere and root-associated microbial communities are known to be related to soil-borne disease and plant health. In the present study, the microbial communities in rhizosphere soils and roots of both healthy and diseased Panax notoginseng were analyzed by high-throughput sequencing of 16S rRNA for bacteria and 18S rRNA internal transcribed spacer for fungi, to reveal the relationship of microbial community structure with plant health status. In total, 5593 bacterial operational taxonomic units (OTUs) and 963 fungal OTUs were identified in rhizosphere soils, while 1794 bacterial and 314 fungal OTUs were identified from root samples respectively. Principal coordinate analysis separated the microbial communities both in the rhizosphere soils and roots of diseased P. notoginseng from healthy plants. Compared to those of healthy P. notoginseng, microbial communities in rhizosphere soils and roots of diseased plants showed a decrease in alpha diversity. By contrast, bacterial community dissimilarity increased and fungal community dissimilarity decreased in rhizosphere soils of diseased plants, while both bacterial and fungal community dissimilarity in roots showed no significant difference between healthy and diseased plants. Redundancy analysis at the phylum level showed that mycorrhizal colonization and soil texture significantly affected microbial community composition in rhizosphere soils, whereas shoot nutrition status had a significant effect on microbial community composition in root samples. Our study provided strong evidence for the hypothesis that microbial diversity could potentially serve as an indicator for disease outbreak of medicinal plants, and supported the ecological significance of microbial communities in maintaining plant healthy and soil fertility.

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“…For this purpose, root colonizing plant beneficial microorganisms have been used including species of Pseudomonas (Pseudomonas fluorescens, P. putida, P. aureofaciens) [20–24], Bacillus (Bacillus subtilis, B. Polymyxa, and B. cereus) [25–27], non-pathogenic Fusarium [28, 29], and Actinobacteria [30–33]. These microbes possess many traits that make them well suited as biocontrol and growth-promoting agents.…”

Section: Introductionmentioning

confidence: 99%

“…These include a wide range of antibiotics as well as a variety of enzymes (i.e., chitinases), which degrade the fungal cell wall [35–40]. Metabolites from streptomycetes have been used in agriculture as growth promoters [41–44] and selected strains of the genus also have been used as direct biocontrol agents for other plant diseases [30, 45–48]. …”

Section: Introductionmentioning

confidence: 99%

Streptomyces rocheiACTA1551, an Indigenous Greek Isolate Studied as a Potential Biocontrol Agent againstFusarium oxysporumf.sp.lycopersici

Kanini

Katsifas

Savvides

et al. 2013

BioMed Research International

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Many studies have shown that several Greek ecosystems inhabit very interesting bacteria with biotechnological properties. Therefore Streptomyces isolates from diverse Greek habitats were selected for their antifungal activity against the common phytopathogenic fungus Fusarium oxysporum. The isolate encoded ACTA1551, member of Streptomyces genus, could strongly suppress the fungal growth when examined in antagonistic bioassays in vitro. The isolate was found phylogenetically relative to Streptomyces rochei after analyzing its 16S rDNA sequence. The influence of different environmental conditions, such as medium composition, temperature, and pH on the expression of the antifungal activity was thoroughly examined. Streptomyces rochei ACTA1551 was able to protect tomato seeds from F. oxysporum infection in vivo while it was shown to promote the growth of tomato plants when the pathogen was absent. In an initial effort towards the elucidation of the biochemical and physiological nature of ACTA1551 antifungal activity, extracts from solid streptomycete cultures under antagonistic or/and not antagonistic conditions were concentrated and fractionated. The metabolites involved in the antagonistic action of the isolate showed to be more than one and produced independently of the presence of the pathogen. The above observations could support the application of Streptomyces rochei ACTA1551 as biocontrol agent against F. oxysporum.

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Plant community effects on the diversity and pathogen suppressive activity of soil streptomycetes

Cited by 58 publications

References 57 publications

Sympatric inhibition and niche differentiation suggest alternative coevolutionary trajectories among Streptomycetes

Sympatric inhibition and niche differentiation suggest alternative coevolutionary trajectories among Streptomycetes

Molecular characterization of microbial communities in the rhizosphere soils and roots of diseased and healthy Panax notoginseng

Streptomyces rocheiACTA1551, an Indigenous Greek Isolate Studied as a Potential Biocontrol Agent againstFusarium oxysporumf.sp.lycopersici

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