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Salt-tolerant plant growth-promoting bacteria as a versatile tool for combating salt stress in crop plants

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Abstract

Soil salinization poses a great threat to global agricultural ecosystems, and finding ways to improve the soils affected by salt and maintain soil health and sustainable productivity has become a major challenge. Various physical, chemical and biological approaches are being evaluated to address this escalating environmental issue. Among them, fully utilizing salt-tolerant plant growth-promoting bacteria (PGPB) has been labeled as a potential strategy to alleviate salt stress, since they can not only adapt well to saline soil environments but also enhance soil fertility and plant development under saline conditions. In the last few years, an increasing number of salt-tolerant PGPB have been excavated from specific ecological niches, and various mechanisms mediated by such bacterial strains, including but not limited to siderophore production, nitrogen fixation, enhanced nutrient availability, and phytohormone modulation, have been intensively studied to develop microbial inoculants in agriculture. This review outlines the positive impacts and growth-promoting mechanisms of a variety of salt-tolerant PGPB and opens up new avenues to commercialize cultivable microbes and reduce the detrimental impacts of salt stress on plant growth. Furthermore, considering the practical limitations of salt-tolerant PGPB in the implementation and potential integration of advanced biological techniques in salt-tolerant PGPB to enhance their effectiveness in promoting sustainable agriculture under salt stress are also accentuated.

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Acknowledgements

This work was financially supported by Guizhou Provincial Basic Research Program (Natural Science) [No. Qiankehe Foundation-ZK (2024) General 089], Guizhou Provincial Department of Education Youth Science and Technology Talent Development Project [No. Qianjiaoji (2024) 35], Scientific Research Innovation Team Project of Guizhou University [No. Guidakechuangtuan (2024) 06] and Special Project of Natural Science Foundation of Guizhou University [No. Gui Da Te Gang He Zi (2023) 16].

Funding

Guizhou Provincial Basic Research Program (Natural Science) [No. Qiankehe Foundation-ZK (2024) General 089], Guizhou Provincial Department of Education Youth Science and Technology Talent Development Project [No. Qianjiaoji (2024) 35], Scientific Research Innovation Team Project of Guizhou University [No. Guidakechuangtuan (2024) 06], Special Project of Natural Science Foundation of Guizhou University [No. Gui Da Te Gang He Zi (2023) 16].

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  1. Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences, Guizhou University, Guiyang, 550025, Guizhou, China

    Xue **e, Longzhan Gan, Chengyang Wang & Tengxia He

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  1. Xue **e
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  3. Chengyang Wang
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Contributions

Xue **e : Visualization, Data curation, Writing - original draft, Writing - review and editing, Formal analysis. Longzhan Gan: Supervision, Resources, Conceptualization, Funding acquisition, Formal analysis, Writing-review and editing. Chengyang Wang : Visualization, Formal analysis. Tengxia He: Supervision, Resources, Writing-review and editing.

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Correspondence to Longzhan Gan or Tengxia He.

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**e, X., Gan, L., Wang, C. et al. Salt-tolerant plant growth-promoting bacteria as a versatile tool for combating salt stress in crop plants. Arch Microbiol 206, 341 (2024). https://doi.org/10.1007/s00203-024-04071-8

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