Role of Bacillus subtilis exopolymeric genes in modulating rhizosphere microbiome assembly.

Autor: Nishisaka CS; Embrapa Environment, Jaguariúna, SP, Brazil.; Graduate Program in Agricultural Microbiology, College of Agriculture 'Luiz de Queiroz', University of São Paulo, Piracicaba, SP, Brazil., Ventura JP; Embrapa Environment, Jaguariúna, SP, Brazil.; Graduate Program in Agricultural Microbiology, College of Agriculture 'Luiz de Queiroz', University of São Paulo, Piracicaba, SP, Brazil., Bais HP; Department of Plant and Soil Sciences, University of Delaware, Newark, DE, USA.; Ammon Pinizzotto Biopharmaceutical Innovation Center (BPI), Newark, DE, USA., Mendes R; Embrapa Environment, Jaguariúna, SP, Brazil. rodrigo.mendes@embrapa.br.
Jazyk: angličtina
Zdroj: Environmental microbiome [Environ Microbiome] 2024 May 14; Vol. 19 (1), pp. 33. Date of Electronic Publication: 2024 May 14.
DOI: 10.1186/s40793-024-00567-4
Abstrakt: Background: Bacillus subtilis is well known for promoting plant growth and reducing abiotic and biotic stresses. Mutant gene-defective models can be created to understand important traits associated with rhizosphere fitness. This study aimed to analyze the role of exopolymeric genes in modulating tomato rhizosphere microbiome assembly under a gradient of soil microbiome diversities using the B. subtilis wild-type strain UD1022 and its corresponding mutant strain UD1022 eps-TasA , which is defective in exopolysaccharide (EPS) and TasA protein production.
Results: qPCR revealed that the B. subtilis UD1022 eps-TasA- strain has a diminished capacity to colonize tomato roots in soils with diluted microbial diversity. The analysis of bacterial β-diversity revealed significant differences in bacterial and fungal community structures following inoculation with either the wild-type or mutant B. subtilis strains. The Verrucomicrobiota, Patescibacteria, and Nitrospirota phyla were more enriched with the wild-type strain inoculation than with the mutant inoculation. Co-occurrence analysis revealed that when the mutant was inoculated in tomato, the rhizosphere microbial community exhibited a lower level of modularity, fewer nodes, and fewer communities compared to communities inoculated with wild-type B. subtilis.
Conclusion: This study advances our understanding of the EPS and TasA genes, which are not only important for root colonization but also play a significant role in shaping rhizosphere microbiome assembly. Future research should concentrate on specific microbiome genetic traits and their implications for rhizosphere colonization, coupled with rhizosphere microbiome modulation. These efforts will be crucial for optimizing PGPR-based approaches in agriculture.
(© 2024. The Author(s).)
Databáze: MEDLINE
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