OsSRK1,an Atypical S-Receptor-Like Kinase Positively Regulates Leaf Width and Salt Tolerance in Rice  

作　　者：ZHOU Jinjun JU Peina ZHANG Fang ZHENG Chongke BAI Bo LI Yaping WANG Haifeng CHEN Fan XIE Xianzhi 

机构地区：[1]Shandong Rice Research Institute,Shandong Academy of Agricultural Sciences,Jinan 250100,China [2]Institute of Genetics and Development Biology,the Chinese Academy of Science,Beijing 100190,China [3]Shangdong Normal University,Jinan 250014,China

出　　处：《Rice science》2020年第2期133-142,共10页水稻科学（英文版）

基　　金：This work was supported by grants from Excellent Middle-Aged and Youth Scientist Award Foundation of Shandong Province(Grant No.BS2014SW029);the Shandong Natural Science Foundation(Grant Nos.ZR2016CB17 and ZR2018ZC08N2);Shandong Major Agricultural Applied Technological Innovation Projects(Grant No.2017.04-2020.04)in China.

摘　　要：Receptor-like kinases(RLKs)are important for plant growth,development and defense responses.The S-receptor protein kinases(SRKs),which represent an RLK subfamily,control the selfincompatibility among Brassica species.However,little information is available regarding SRK functions in rice.We identified a gene OsSRK1 encoding an atypical SRK.The transcript of OsSRK1 was induced by abscisic acid(ABA),salt and polyethylene glycol.OsSRK1 localized to the plasma membrane and cytoplasm.Leaf width was increased in OsSRK1-overexpression(OsSRK1-OX)transgenic rice plants,likely because of an increase in cell number per leaf.Furthermore,the expression levels of OsCYCA3-1 and OsCYCD2-1,which encode positive regulators of cell division,were up-regulated in leaf primordium of OsSRK1-OX rice plants relative to those in wild type.Meanwhile,the expression level of OsKRP1,which encodes cell cycle inhibitor,was down-regulated in the OsSRK1-OX plants.Therefore,it is deduced that OsSRK1 regulates leaf width by promoting cell division in the leaf primordium.Additionally,OsSRK1-OX plants exhibited enhanced ABA sensitivity and salt tolerance compared with wild type.These results suggest that OsSRK1 plays important roles in leaf development and salt responses in rice.

关 键 词：RICE S-receptor-like protein KINASE OsSRK1 salt tolerance LEAF width cell division 

分 类 号：S511[农业科学—作物学]