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<p>Soil salinity is a&#xa0;global challenge, and high salinity in agricultural soils causes significant toxicity, hindering crop health and yield. In the present study, <i>Priestia megaterium</i> KUSP06 was isolated from rice rhizosphere of salt-affected soil and identified using biochemical characterization and 16S <i>rDNA</i> sequencing. The isolate could tolerate NaCl up to 15%, and showed different <i>in-vitro</i> plant-growth-stimulating characteristics, including biosynthesis of indole-3-acetic acid (IAA), siderophore, ACC deaminase, ammonia, and salt-adaptive characteristics such as increased production of proline, exopolysaccharides under the salinity stress. The inoculation of the isolate to the rice seedlings grown in soil containing 1% NaCl significantly (<i>p</i> ≤ 0.05) enhanced the root fresh weight (60%), plant fresh weight (120%), plant height (27.5%), root length (50%), and total chlorophyll content (55.25%) even in the presence of 1% NaCl. Additionally, bacterial inoculation reduced the proline content of the plant by 50.19% and increased catalase (44.28%) and ascorbate peroxidase (60.71%) in presence of the salinity stress. Thus, <i>P.&#xa0;megaterium</i> KUSP06 could be potentially used as a&#xa0;bioinoculant in salinized agricultural land to increase crop productivity.</p>

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Harnessing Priestia megaterium KUSP06 to Improve Rice Growth and Soil Health Under Salinity Stress

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Avijit Sarkar,
  • Bejoysekhar Datta

摘要

Soil salinity is a global challenge, and high salinity in agricultural soils causes significant toxicity, hindering crop health and yield. In the present study, Priestia megaterium KUSP06 was isolated from rice rhizosphere of salt-affected soil and identified using biochemical characterization and 16S rDNA sequencing. The isolate could tolerate NaCl up to 15%, and showed different in-vitro plant-growth-stimulating characteristics, including biosynthesis of indole-3-acetic acid (IAA), siderophore, ACC deaminase, ammonia, and salt-adaptive characteristics such as increased production of proline, exopolysaccharides under the salinity stress. The inoculation of the isolate to the rice seedlings grown in soil containing 1% NaCl significantly (p ≤ 0.05) enhanced the root fresh weight (60%), plant fresh weight (120%), plant height (27.5%), root length (50%), and total chlorophyll content (55.25%) even in the presence of 1% NaCl. Additionally, bacterial inoculation reduced the proline content of the plant by 50.19% and increased catalase (44.28%) and ascorbate peroxidase (60.71%) in presence of the salinity stress. Thus, P. megaterium KUSP06 could be potentially used as a bioinoculant in salinized agricultural land to increase crop productivity.