Rice (Oryza sativa L.) growth and productivity has been negatively affected due to high soil salinity. However, some salt-tolerant plant growth-promoting bacteria (ST-PGPB) enhance crop growth and reduce the negative impacts of salt stress through regulation of some biochemical, physiological, and molecular features. Total thirty six ST-PGPB were isolated from sodic soil of eastern Uttar Pradesh, India, and screened for salt tolerance at different salt (NaCl) concentrations up to 2000 millimolar (mM). Out of thirty-six, thirteen strains indicated better growth and plant growth properties (PGPs) in NaCl amended medium. Among thirteen, one most effective Bacillus pumilus strain JPVS11 was molecularly characterized, which showed potential PGPs, such as indole-3-acetic acid (IAA),1-aminocyclo propane-1-carboxylicacid (ACC) deaminase activity, P-solubilization, proline accumulation and exopolysaccharides (EPS) production at different concentrations of NaCl (0to1200 mM). Pot experiment was conducted on rice (Variety CSR46) at different NaCl concentrations (0, 50, 100, 200, and 300 mM) with and without inoculation of Bacillus pumilus strain JPVS11. At an elevated concentration of NaCl, the adverse effects on chlorophyll content, carotenoids, antioxidant activity was recorded in non-inoculated (only NaCl) plants. However, inoculation of Bacillus pumilus strain JPVS11 showed positive adaption and improve growth performance of rice as compared to non-inoculated in similar conditions. A significant (P < 0.05) enhancement plant height (12.90 to 26.48%), root length (9.55 to 23.09%), chlorophyll content (10.13 to 27.24%), carotenoids (8.38 to 25.44%), plant fresh weight (12.33 to 25.59%), and dry weight (8.66 to 30.89%) were recorded from in 50 to 300 mM NaCl concentration in inoculated plants as compared to non-inoculated. Moreover, the plants inoculated with Bacillus pumilus strain JPVS11showed improvement in antioxidant enzyme activities of catalase (15.14 to 32.91%) and superoxide dismutase (8.68 to 26.61%). Besides, the significant improvement in soil enzyme activities, such as alkaline phosphatase (18.37 to 53.51%), acid phosphatase (28.42 to 45.99%), urease (14.77 to 47.84%), and β-glucosidase (25.21to 56.12%) were recorded in inoculated pots as compared to non-inoculated. These results suggest that Bacillus pumilus strain JPVS11 is a potential ST-PGPB for promoting plant growth attributes, soil enzyme activities, microbial counts, and mitigating the deleterious effects of salinity in rice.

由于土壤盐分高，水稻（Oryza sativa L.）的生长和生产力受到不利影响。但是，某些耐盐植物生长细菌（ST-PGPB）通过调节某些生化，生理和分子特征来促进作物生长并减少盐胁迫的负面影响。从印度北方邦东部的苏打土壤中分离出总共36种ST-PGPB，并筛选了不同盐（NaCl）浓度高达2000毫摩尔（mM）的耐盐性。在36株菌株中，有13株表明在NaCl改良培养基中具有更好的生长和植物生长特性（PGP）。在十三个最有效的短小芽孢杆菌中对JPVS11菌株进行了分子表征，显示了潜在的PGP，例如吲哚-3-乙酸（IAA），1-氨基环丙烷-1-羧酸（ACC）的脱氨酶活性，P增溶，脯氨酸积累和胞外多糖（EPS）的产生。不同浓度的NaCl（0至1200 mM）。在不同的氯化钠浓度（0、50、100、200和300 mM）下，在有和没有接种短小芽孢杆菌JPVS11的水稻上进行盆栽试验（品种CSR46）。在较高浓度的NaCl中，记录了未接种（仅NaCl）植物对叶绿素含量，类胡萝卜素，抗氧化活性的不利影响。但是，接种短小芽孢杆菌与未接种相似条件的水稻相比，JPVS11菌株表现出正适应性并改善了水稻的生长性能。显着（P <0.05）提高株高（12.90至26.48％），根长（9.55至23.09％），叶绿素含量（10.13至27.24％），类胡萝卜素（8.38至25.44％），植物鲜重（12.33至25.59）与未接种的植物相比，接种植物中50至300 mM NaCl的浓度记录了干重（8.6％至30.89％）。此外，接种了短小芽孢杆菌的植物JPVS11菌株在过氧化氢酶（15.14至32.91％）和超氧化物歧化酶（8.68至26.61％）的抗氧化酶活性方面有所改善。此外，记录到的土壤酶活性显着改善，例如碱性磷酸酶（18.37至53.51％），酸性磷酸酶（28.42至45.99％），脲酶（14.77至47.84％）和β-葡萄糖苷酶（25.21至56.12％）。与未接种的相比 这些结果表明，短小芽孢杆菌JPVS11菌株是潜在的ST-PGPB，用于促进植物生长特性，土壤酶活性，微生物数量以及减轻水稻盐分的有害影响。