The osmolyte-producing endophyte Streptomyces albidoflavus OsiLf-2 induces drought and salt tolerance in rice via a multi-level mechanism  

作　　者：Shuqi Niu Yan Gao Huixian Zi Ying Liu Xuanming Liu Xianqiu Xiong Qingqing Yao Ziwei Qin Ning Chen Liang Guo Yuanzhu Yang Peng Qin Jianzhong Lin Yonghua Zhu 

机构地区：[1]Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation,College of Biology,Hunan University,Changsha 410008,Hunan,China [2]Yuan Longping High-Tech Agriculture Co.,Ltd.,Changsha 410001,Hunan,China

出　　处：《The Crop Journal》2022年第2期375-386,共12页作物学报（英文版）

基　　金：financial support from the National Natural Science Foundation of China(31672093 and 31871595);National Key Research and Development Program of China(2018YFD1000603);Hunan Provincial Important Science and Technology Specific Projects(2018NK1010);Key Research and Development Project in Hunan Province,China(2019NK2192)。

摘　　要：Drought and salinity are major environmental stresses that impair crop growth and productivity worldwide. Improving drought and salt tolerance of crops with microbial mutualists is an effective and environmentally sound strategy to meet the demands of the ever-growing world population. In the present study, we found that the Streptomyces albidoflavus Osi Lf-2, a moderately salt-tolerant endophytic actinomycete, produced abundant osmolytes, including proline, polysaccharides, and ectoine. Inoculation with Osi Lf-2 increased the osmotic-adjustment ability of the rice host by increasing the proline content(by250.3% and 49.4%) and soluble sugar(by 20.9% and 49.4%) in rice under drought and salt conditions, relative to the uninoculated control. Osi Lf-2 increased stress responses in the rice host at the physiological and biochemical levels(photosynthesis efficiency, osmolytes and antioxidant content), and the gene level(osmolytes synthesis, stress-responsive and ion-transport related genes), raising rice yields under both greenhouse and saline–alkaline soil conditions. The use of endophytic actinomycetes offers a promising biotechnological approach to developing stress-tolerant plants.

关 键 词：RICE Endophytic actinomycete OSMOLYTES Salt tolerance Drought tolerance 

分 类 号：S511[农业科学—作物学]