Biocontrol potential index of pseudomonads, instead of their direct-growth promotion traits, is a predictor of seed inoculation effect on crop productivity under field conditions

Agaras, Betina Cecilia; Noguera, Fabián; Anta, Gustavo González; Wall, Luis Gabriel; Valverde, Claudio

doi:10.1016/j.biocontrol.2020.104209

Cited by 17 publications

(11 citation statements)

References 87 publications

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“…Further, we highlight the importance of swimming motility to escape predation. Recent results from field assays have also demonstrated that, within this set of probiotic Pseudomonas , those with high BPI values showed the highest effect on maize and wheat productivities, over three consecutive seasons and in different locations ( Agaras et al, 2020 ). The correlation of BPI values and the resistance to predation supports the idea that biocontrol traits confer high adaptability and survival in complex environments, such as soil and rhizosphere, allowing the isolates to better display their plant growth promotion.…”

Section: Discussionmentioning

confidence: 85%

Biocontrol Traits Correlate With Resistance to Predation by Protists in Soil Pseudomonads

et al. 2020

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Root-colonizing bacteria can support plant growth and help fend off pathogens. It is clear that such bacteria benefit from plant-derived carbon, but it remains ambiguous why they invest in plant-beneficial traits. We suggest that selection via protist predation contributes to recruitment of plant-beneficial traits in rhizosphere bacteria. To this end, we examined the extent to which bacterial traits associated with pathogen inhibition coincide with resistance to protist predation. We investigated the resistance to predation of a collection of Pseudomonas spp. against a range of representative soil protists covering three eukaryotic supergroups. We then examined whether patterns of resistance to predation could be explained by functional traits related to plant growth promotion, disease suppression and root colonization success. We observed a strong correlation between resistance to predation and phytopathogen inhibition. In addition, our analysis highlighted an important contribution of lytic enzymes and motility traits to resist predation by protists. We conclude that the widespread occurrence of plant-protective traits in the rhizosphere microbiome may be driven by the evolutionary pressure for resistance against predation by protists. Protists may therefore act as microbiome regulators promoting native bacteria involved in plant protection against diseases.

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Section: Discussionmentioning

confidence: 85%

Biocontrol Traits Correlate With Resistance to Predation by Protists in Soil Pseudomonads

et al. 2020

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“…Similarly, in another study, bacterial biocontrol potential obtained from various controlled assays was found to be a powerful indicator of bacterial performance in a field experience (Agaras et al . 2020 ). Protist feeding assays might thus be used to predict predatory impact of specific protists thereby providing information on how to steer bacterial communities as previously suggested (Gao et al .…”

Section: Discussionmentioning

confidence: 99%

Protist feeding patterns and growth rate are related to their predatory impacts on soil bacterial communities

Amacker

Gao

et al. 2022

FEMS Microbiology Ecology

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Predatory protists are major consumers of soil micro-organisms. By selectively feeding on their prey, they can shape soil microbiome composition and functions. While different protists are known to show diverging impacts, it remains impossible to predict a priori the effect of a given species. Various protist traits including phylogenetic distance, growth rate and volume have been previously linked to the predatory impact of protists. Closely-related protists,however, also showed distinct prey choices which could mirror specificity in their dietary niche. We, therefore, aimed to estimate the dietary niche breadth and overlap of eight protist isolates on 20 bacterial species in plate assays. To assess the informative value of previously suggested and newly proposed (feeding-related) protist traits, we related them to the impacts of predation of each protist on a protist-free soil bacterial community in a soil microcosm via 16S rRNA gene amplicon sequencing. We could demonstrate that each protist showed a distinct feeding pattern in vitro. Further, the assayed protist feeding patterns and growth rates correlated well with the observed predatory impacts on the structure of soil bacterial communities. We thus conclude that in vitro screening has the potential to inform on the specific predatory impact of selected protists.

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“…In recent years, many studies have demonstrated that Pseudomonas strains from the plant rhizosphere could control diseases caused by a variety of pathogens [ 21 , 38 , 39 , 40 ]. For example, Pseudomonas fluorescens CV6 had broad antimicrobial activity against 12 pathogens [ 41 ], and P. fluorescens VUPf5 strongly inhibited G. graminis var.…”

Section: Discussionmentioning

confidence: 99%

“…tritici , and possess plant growth-promoting characteristics such as phosphate solubilization, siderophores, 1-aminocyclopropane-1-carboxylate (ACC) deaminase and indole-3-acetic acid (IAA), etc. [ 20 , 21 , 22 , 23 , 24 ]. For example, P. chlororaphis 30–84 produced the antibiotic sphenazine-1-carboxylic acid (PCA) that effectively inhibited take-all [ 23 ]; P. fluorescens 2–79 also produced the antibiotics PCA that strongly inhibited G. graminis var.…”

Section: Introductionmentioning

confidence: 99%

Biological Control of Take-All and Growth Promotion in Wheat by Pseudomonas chlororaphis YB-10

Deng

et al. 2021

Pathogens

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Wheat is a worldwide staple food crop, and take-all caused by Gaeumannomyces graminis var. tritici can lead to a tremendous decrease in wheat yield and quality. In this study, strain YB-10 was isolated from wheat rhizospheric soil and identified as Pseudomonas chlororaphis by morphology and 16S rRNA gene sequencing. Pseudomonas chlororaphis YB-10 had extracellular protease and cellulase activities and strongly inhibited the mycelium growth of Gaeumannomyces graminis var. tritici in dual cultures. Up to 87% efficacy of Pseudomonas chlororaphis YB-10 in controlling the take-all of seedlings was observed in pot experiments when wheat seed was coated with the bacterium. Pseudomonas chlororaphis YB-10 was also positive for indole acetic acid (IAA) and siderophore production, and coating wheat seed with the bacterium significantly promoted the growth of seedlings at 107 and 108 CFU/mL. Furthermore, treatment with Pseudomonas chlororaphis YB-10 increased activities of the wheat defense-related enzymes POD, SOD, CAT, PAL and PPO in seedlings, indicating induced resistance against pathogens. Overall, Pseudomonas chlororaphis YB-10 is a promising new seed-coating agent to both promote wheat growth and suppress take-all.

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Biocontrol potential index of pseudomonads, instead of their direct-growth promotion traits, is a predictor of seed inoculation effect on crop productivity under field conditions

Cited by 17 publications

References 87 publications

Biocontrol Traits Correlate With Resistance to Predation by Protists in Soil Pseudomonads

Biocontrol Traits Correlate With Resistance to Predation by Protists in Soil Pseudomonads

Protist feeding patterns and growth rate are related to their predatory impacts on soil bacterial communities

Biological Control of Take-All and Growth Promotion in Wheat by Pseudomonas chlororaphis YB-10

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