Role of Halotolerant Plant Growth-Promoting Rhizobacteria in Mitigating Salinity Stress: Recent Advances and Possibilities

Vikash Kumar, Nikhil Raghuvanshi, Abhay K. Pandey, Abhishek Kumar, Emily Thoday-Kennedy and Surya Kant ()
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Vikash Kumar: Faculty of Agricultural Science, GLA University, Mathura, Uttar Pradesh 281 406, India
Nikhil Raghuvanshi: Department of Agriculture, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh 273 009, India
Abhay K. Pandey: Department of Mycology and Microbiology, Tea Research Association-North Bengal Regional R & D Center, Nagrakata, West Bengal 735 225, India
Abhishek Kumar: Department of Plant Pathology, Chaudhary Charan Singh Haryana Agriculture University, Hisar, Haryana 125 004, India
Emily Thoday-Kennedy: Agriculture Victoria, Grains Innovation Park, Horsham, VIC 3400, Australia
Surya Kant: Agriculture Victoria, Grains Innovation Park, Horsham, VIC 3400, Australia

Agriculture, 2023, vol. 13, issue 1, 1-22

Abstract: Soil salinity is one of the major abiotic constraints in agricultural ecosystems worldwide. High salinity levels have negative impacts on plant growth and yield, and affect soil physicochemical properties. Salinity also has adverse effects on the distribution and abundance of soil microorganisms. Salinity problems have previously been addressed in research, but most approaches, such as breeding for salt tolerant varieties and soil amelioration, are expensive and require years of efforts. Halotolerant plant growth-promoting rhizobacteria (HT-PGPR) secrete secondary metabolites, including osmoprotectants, exopolysaccharides, and volatile organic compounds. The importance of these compounds in promoting plant growth and reducing adverse effects under salinity stress has now been widely recognised. HT-PGPR are emerging as effective biological strategies for mitigating the harmful effects of high salinity; improving plant growth, development, and yield; and remediating degraded saline soils. This review describes the beneficial effects and growth-promoting mechanisms of various HT-PGPR, which are carried out by maintaining ion homeostasis, increasing nutrient availability, and the producing secondary metabolites, osmoprotectants, growth hormones, and volatile organic compounds. Exploring suitable HT-PGPR and applications in agriculture production systems can play a crucial role in reducing the adverse impacts of salinity stress and sustainable crop productivity.

Keywords: exopolysaccharides; osmoprotectants; growth hormones; soil microbes; volatile organic compounds (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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