For sustainable agriculture in saline soil, extensive exploitation of salt-tolerant plant growth-promoting (PGP) bacteria and other symbiotic bacteria is required. This study was carried out to evaluate the efficiency of native salt-tolerant rice rhizobacteria for plant growth promotion under salt stress. A total of 188 bacteria were screened for assessing salt-tolerant capacity and nine isolates tolerating 12% NaCl (w/v) concentration were selected. Biochemical and molecular identification revealed that the salt-tolerant bacteria belonged to Bacillus sp, Exiguobacterium sp, Enterobacter sp, Lysinibacillus sp, Stenotrophomonas sp, Microbacterium sp, and Achromobacter sp. The increase in NaCl concentration from 2 to 4% decreases the PGP activities such as IAA production, P solubilization, K solubilization, and nitrate reduction. The effects of inoculation of salt-tolerant bacteria on the growth and different physiological properties of rice (Oryza sativa) were studied. It was found that the salinity affected the root and shoot length of the control plants; however, bacterial inoculant were found to effectively promote the growth of paddy under salinity stress. Further, bacterial inoculants substantially enhanced total chlorophyll, proline, total phenol, and oxidative damage such as electrolyte leakage and membrane stability index under salt stress. This study suggests that salt-tolerant PGP bacteria may be used for cultivation of O. sativa in salinized agricultural lands.

译文

为了在盐渍土中实现可持续农业,需要广泛开发耐盐植物促生长 (PGP) 细菌和其他共生细菌。本研究旨在评估天然耐盐水稻根瘤菌在盐胁迫下促进植物生长的效率。总共筛选了188种细菌以评估耐盐能力,并选择了9种12% NaCl (w/v) 浓度的菌株。生化和分子鉴定表明,耐盐细菌属于芽孢杆菌属,外杆菌属,肠杆菌属,赖氨酸杆菌属,窄食单胞菌属,微细菌属和无色杆菌属。NaCl浓度从2增加到4% 会降低PGP活性,例如IAA产生,P增溶,K增溶,和硝酸盐还原。研究了接种耐盐细菌对水稻 (Oryza sativa) 生长和不同生理特性的影响。发现盐度影响对照植物的根长和芽长。但是,发现细菌接种剂可以有效地促进盐度胁迫下稻谷的生长。此外,细菌接种剂在盐胁迫下显着增强了总叶绿素,脯氨酸,总酚和氧化损伤,例如电解质泄漏和膜稳定性指数。这项研究表明,耐盐PGP细菌可用于盐碱化农田的水稻种植。

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