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Contrasting genome patterns of two pseudomonas strains isolated from the date palm rhizosphere to assess survival in a hot arid environment

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Abstract

The plant growth-promoting rhizobacteria (PGPRs) improve plant growth and fitness by multiple direct (nitrogen fixation and phosphate solubilization) and indirect (inducing systematic resistance against phytopathogens, soil nutrient stabilization, and maintenance) mechanisms. Nevertheless, the mechanisms by which PGPRs promote plant growth in hot and arid environments remain poorly recorded. In this study, a comparative genome analysis of two phosphate solubilizing bacteria, Pseudomonas atacamensis SM1 and Pseudomonas toyotomiensis SM2, isolated from the rhizosphere of date palm was performed. The abundance of genes conferring stress tolerance (chaperones, heat shock genes, and chemotaxis) and supporting plant growth (plant growth hormone, root colonization, nitrogen fixation, and phosphate solubilization) were compared among the two isolates. This study further evaluated their functions, metabolic pathways, and evolutionary relationship. Results show that both bacterial strains have gene clusters required for plant growth promotion (phosphate solubilization and root colonization), but it is more abundant in P. atacamensis SM1 than in P. toyotomiensis SM2. Genes involved in stress tolerance (mcp, rbs, wsp, and mot), heat shock, and chaperones (hslJ and hslR) were also more common in P. atacamensis SM1. These findings suggest that P. atacamensis SM1could have better adaptability to the hot and arid environment owing to a higher abundance of chaperone genes and heat shock proteins. It may promote plant growth owing to a higher load of root colonization and phosphate solubilization genes and warrants further in vitro study.

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Acknowledgements

We thank UAE University research office for providing financial support through Start-up research grant (G00003320; 31S409).

Funding

This work was supported by a UAE University start-up research grant (G00003320).

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  1. Department of Biology, College of Science, United Arab Emirates University, 15551, Al Ain, United Arab Emirates

    Shahana Seher Malik, Biduth Kundu, Raja S. AlMaskari & Sunil Mundra

  2. Khalifa Center for Genetic Engineering and Biotechnology, United Arab Emirates University, 15551, Al Ain, United Arab Emirates

    Naganeeswaran Sudalaimuthuasari & Sunil Mundra

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  1. Shahana Seher Malik
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The study was conceived by SSM and SM. BK and RSA performed molecular lab work. NS generated the raw data and assembled the genome. SSM conducted bioinformatic and statistical analyses. SSM drafted the manuscript. SM edited the manuscript and secured funding.

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Malik, S.S., Sudalaimuthuasari, N., Kundu, B. et al. Contrasting genome patterns of two pseudomonas strains isolated from the date palm rhizosphere to assess survival in a hot arid environment. World J Microbiol Biotechnol 38, 207 (2022). https://doi.org/10.1007/s11274-022-03392-4

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