RGB1 Regulates Rice Panicle Architecture and Grain Filling Through Monitoring Cytokinin Level in Inflorescence Meristem and Grain Abscisic Acid Level During Filling Stage  

作　　者：Zhang Dongping Zhang Minyan Wang Yuzhu Liang Jiansheng 

机构地区：[1]Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institute,Department of Biology,Southern University of Science and Technology,Shenzhen 518055,China [2]Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops,Key Laboratory of Plant Functional Genomics of the Ministry of Education,Yangzhou University,Yangzhou 225009,China

出　　处：《Rice science》2021年第4期317-321,I0008-I0011,共9页水稻科学（英文版）

基　　金：supported by the Peacock Science and Technology Innovation Project of Shenzhen,China(Grant No.KQJSCX20170328153821275);the National Natural Science Foundation of China(Grant No.32070292);Shenzhen Government Fund for Fundamental Research(Grant No.JCYJ20170817104523456);Shenzhen Science and Technology Program(Grant No.KQTD20190929173906742)in China.

摘　　要：RGB1 regulated not only rice panicle architecture but also the grain filling process.Suppression of RGB1 expression resulted in a denser panicle and smaller grain size and weight,which was largely due to the lower endogenous cytokinin(CK)level caused by the increased expression of cytokinin oxidase genes in the inflorescence meristem.Suppression of RGB1 expression also significantly delayed the grain development and reduced the starch accumulation rate through reducing grain abscisic acid(ABA)accumulation during early filling stage.Exogenous ABA can partially rescue the detrimental effects of suppression of RGB1 expression on starch accumulation and grain weight.In conclusion,RGB1 regulated rice panicle architecture and grain filling through monitoring CK level in the inflorescence meristem and grain ABA level during filling stage.

关 键 词：PANICLE filling GRAIN 

分 类 号：S511[农业科学—作物学]