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Arsenic stress management through arsenite and arsenate-tolerant growth-promoting bacteria in rice

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Abstract

Arsenic (As) contamination is a major problem affecting soil and groundwater in India, harming agricultural crops and human health. Plant growth-promoting rhizobacteria (PGPR) have emerged as promising agents for reducing As toxicity in plants. This study aimed to isolate and characterize As-tolerant PGPR from rice field soils with varying As levels in five districts of West Bengal, India. A total of 663 bacterial isolates were obtained from the different soil samples, and 10 bacterial strains were selected based on their arsenite (As-III) and arsenate (As-V) tolerant ability and multiple PGP traits, including phosphate solubilization, production of siderophore, indole acetic acid, biofilm formation, alginate, and exopolysaccharide. These isolates were identified by 16S rRNA gene sequencing analysis as Staphylococcus sp. (4), Niallia sp. (2), Priestia sp. (1), Bacillus sp. (1), Pseudomonas sp. (1), and Citricoccus sp. (1). Among the selected bacterial strains, Priestia flexa NBRI4As1 and Pseudomonas chengduensis NBRI12As1 demonstrated significant improvement in rice growth by alleviating arsenic stress under greenhouse conditions. Both strains were also able to modulate photosynthetic pigments, soluble sugar content, proline concentration, and defense enzyme activity. Reduction in As-V accumulation inoculated with NBRI4As1 was recorded highest by 53.02% and 31.48%, while As-III by NBRI12As1 38.84% and 35.98% in the roots and shoots of rice plants, respectively. Overall, this study can lead to developing efficient As-tolerant bacterial strains–based bioinoculant application packages for arsenic stress management in rice.

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Acknowledgements

The authors are thankful to the Director, CSIR-NBRI, Lucknow, for providing the necessary resources to conduct this study. CSIR-NBRI allotted the manuscript number CSIR-NBRI_MS/2023/10/22.

Funding

The study was financially supported by the In-house project OLP116 funded by the Council of Scientific and Industrial Research, New Delhi, India. Basudev Majhi is grateful for the scholarship he received from CSIR, New Delhi, India.

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Basudev Majhi: methodology, writing—original draft, investigation. Pradeep Semwal: writing—review and editing, formal analysis. Shashank Kumar Mishra: methodology, investigation, validation. Sankalp Misra: validation, visualization. Puneet Singh Chauhan: conceptualization, supervision, funding acquisition.

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Correspondence to Puneet Singh Chauhan.

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Majhi, B., Semwal, P., Mishra, S.K. et al. Arsenic stress management through arsenite and arsenate-tolerant growth-promoting bacteria in rice. Int Microbiol (2023). https://doi.org/10.1007/s10123-023-00447-w

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  • DOI: https://doi.org/10.1007/s10123-023-00447-w

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