Screening of siderophore-producing salt-tolerant rhizobacteria suitable for supporting plant growth in saline soils with iron limitation

作者：Shahnaz Sultana, Saiful Alam, Muhammad Manjurul Karim · 发表于：Journal of Agriculture and Food Research · 年份：2021 · DOI：10.1016/j.jafr.2021.100150 · 被引用次数：130 · 研究领域：Legume Nitrogen Fixing Symbiosis、Plant Micronutrient Interactions and Effects、Plant Stress Responses and Tolerance

Iron (Fe) bioavailability to plants is reduced in saline soils; therefore, plants growing in arid soils face two major challenges for poor crop productivity: high salinity and Fe deficiency. Siderophore-producing plant growth-promoting rhizobacteria (PGPR) could be a promising alternative to chemical fertilizers that could tackle salt stress and Fe limitation in saline soils concurrently. Here, four salt-tolerant PGPR, isolated from the root area of salt-prone rice fields of Bangladesh were studied to evaluate their siderophore-producing ability. Bacillus aryabhattai MS3 exhibited the highest production, estimated at 60% and 43% under non-saline and saline (200 mM NaCl) conditions respectively. The expression of the entD gene, which is involved in the biosynthesis of siderophore was evidenced irrespective of saline states. Therefore, consideration of such salt-tolerant, siderophore-producing PGPR for producing biofertilizer could be an eco-friendly innovation for climate-smart agriculture in salinized soils with limited iron availability.