Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), College of Life Sciences, Guizhou University, Guiyang, 550025, Guizhou, China.
Arch Microbiol. 2024 Jul 5;206(8):341. doi: 10.1007/s00203-024-04071-8.
Soil salinization poses a great threat to global agricultural ecosystems, and finding ways to improve the soils affected by salt and maintain soil health and sustainable productivity has become a major challenge. Various physical, chemical and biological approaches are being evaluated to address this escalating environmental issue. Among them, fully utilizing salt-tolerant plant growth-promoting bacteria (PGPB) has been labeled as a potential strategy to alleviate salt stress, since they can not only adapt well to saline soil environments but also enhance soil fertility and plant development under saline conditions. In the last few years, an increasing number of salt-tolerant PGPB have been excavated from specific ecological niches, and various mechanisms mediated by such bacterial strains, including but not limited to siderophore production, nitrogen fixation, enhanced nutrient availability, and phytohormone modulation, have been intensively studied to develop microbial inoculants in agriculture. This review outlines the positive impacts and growth-promoting mechanisms of a variety of salt-tolerant PGPB and opens up new avenues to commercialize cultivable microbes and reduce the detrimental impacts of salt stress on plant growth. Furthermore, considering the practical limitations of salt-tolerant PGPB in the implementation and potential integration of advanced biological techniques in salt-tolerant PGPB to enhance their effectiveness in promoting sustainable agriculture under salt stress are also accentuated.
土壤盐渍化对全球农业生态系统构成了巨大威胁，寻找改善受盐影响的土壤并维持土壤健康和可持续生产力的方法已成为一项重大挑战。各种物理、化学和生物方法正在被评估，以应对这一不断升级的环境问题。其中，充分利用耐盐植物促生菌（PGPB）已被标记为缓解盐胁迫的一种潜在策略，因为它们不仅能很好地适应盐渍土环境，而且能在盐胁迫条件下增强土壤肥力和植物生长。在过去几年中，越来越多的耐盐 PGPB 已从特定的生态位中被挖掘出来，并且此类细菌菌株介导的各种机制，包括但不限于铁载体生产、固氮、增强养分可用性和植物激素调节，已被深入研究，以开发农业中的微生物接种剂。本综述概述了各种耐盐 PGPB 的积极影响和促生长机制，为可培养微生物的商业化和减少盐胁迫对植物生长的不利影响开辟了新途径。此外，还强调了耐盐 PGPB 在实施和潜在整合耐盐 PGPB 先进生物技术方面的实际局限性，以提高其在促进盐胁迫下可持续农业中的有效性。
