Unearthing the Plant Growth-Promoting Traits of Bacillus megaterium RmBm31, an Endophytic Bacterium Isolated From Root Nodules of Retama monosperma

Plants live in association with complex populations of microorganisms, including Plant Growth-Promoting Rhizobacteria (PGPR) that confer to plants an improved growth and enhanced stress tolerance. This large and diverse group includes endophytic bacteria that are able to colonize the internal tissue...

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Published in:Frontiers in plant science 2020-02, Vol.11, p.124-124
Main Authors: Dahmani, Malika Affaf, Desrut, Antoine, Moumen, Bouziane, Verdon, Julien, Mermouri, Lamia, Kacem, Mourad, Coutos-Thévenot, Pierre, Kaid-Harche, Meriem, Bergès, Thierry, Vriet, Cécile
Format: Article
Language:English
Subjects:
Arabidopsis thaliana
Bacillus megaterium
Biochemistry
Biochemistry, Molecular Biology
Biodiversity and Ecology
endophyte
Environmental Sciences
Life Sciences
plant growth-promoting rhizobacteria
Plant Science
Retama monosperma
root nodules
Vegetal Biology
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Summary:Plants live in association with complex populations of microorganisms, including Plant Growth-Promoting Rhizobacteria (PGPR) that confer to plants an improved growth and enhanced stress tolerance. This large and diverse group includes endophytic bacteria that are able to colonize the internal tissues of plants. In the present study, we have isolated a nonrhizobial species from surface sterilized root nodules of , a perennial leguminous species growing in poor and high salinity soils. Sequencing of its genome reveals this endophytic bacterium is a strain (RmBm31) that possesses a wide range of genomic features linked to plant growth promotion. Furthermore, we show that RmBm31 is able to increase the biomass and positively modify the root architecture of seedlings of the model plant species both in physical contact with its roots and the production of volatile organic compounds. Lastly, we investigated the molecular mechanisms implicated in RmBm31 plant beneficial effects by carrying out a transcriptional analysis on a comprehensive set of phytohormone-responsive marker genes. Altogether, our results demonstrate that RmBm31 displays plant growth-promoting traits of potential interest for agricultural applications.
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2020.00124