Tiller Bud Formation Regulators MOC1 and MOC3 Cooperatively Promote Tiller Bud Outgrowth by Activating F0N1 Expression in Rice

查看全文 作　　者：Gaoneng [1,2,3]Shao;Zefu [1,5]Lu;Jinsong [1,6]Xiong;Bing [1]Wang;Yanhui [1]Jing;Xiangbing [1]Meng;Guifu [1]Liu;Haiyan [1]Ma;Yan [1]Liang;Fan [4]Chen;Yonghong [1,2]Wang;Jiayang [1,2]Li;Hong [1]Yu

机构地区：[1]State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing),Institute of Genetics and Developmental Biology,The Innovative Academy of Seed Design,Chinese Academy of Sciences,Beijing 100101,China;[2]University of Chinese Academy of Sciences,Beijing 100049,China;[3]State Key Laboratory of Rice Biology,China National Rice Research Institute,Hangzhou 310006,China;[4]State Key Laboratory of Molecular Developmental Biology,Institute of Genetics and Developmental Biology,The Innovative Academy of Seed Design,Chinese Academy of Sciences,Beijing 100101,China;[5]Present address: Department of Genetics,University of Georgia,Athens,GA 30605,USA;[6]Present address: College of Horticulture,Nanjing Agricultural University,Nanjing,Jiangsu 210095,China

出　　处：《Molecular Plant》索引2019年第12卷第8期,共13页

基　　金：supported by the grants from the National Natural Science Foundation of China (31788103,91635301). 摘　　要：Tillering in rice is one of the most important agronomic traits.Rice tiller development can be divided into two main processes: the formation of the axillary bud and its subsequent outgrowth.Several genes critical for bud formation in rice have been identified by genetic studies;however,their molecular functions and relationships are still largely unknown.Here,we report that MONOCULM 1 (MOC1) and MONOCULM 3/ TILLERS ABSENT 1/STERILE AND REDUCED TILLERING 1 (MOC3/TAB1/SRT1),two vital regulators for tiller formation in rice,physically interact to regulate tiller bud outgrowth through upregulating the expression of FLORAL ORGAN NUMBER 1 (FON1),the homolog of CLAVATA1 in rice.We found that M0C3 is able to directly bind the promoter ofFONI and subsequently activate FON1 expression.MOC1 functions as a coactivator of MOC3,whereas it could not directly bind the FON1 promoter,and further activated FON1 expression in the presence of MOC3.Accordingly,FON1 is highly expressed at axillary meristems and shows remarkably decreased expression levels in mod and moc3 mutants.Loss-of-function mutants of FON1 exhibit normal bud formation but defective bud outgrowth and reduced tiller number.Collectively,these results shed light on a joint transcriptional regulatory mechanim by MOC1 and MOC3,and establish a new framework for the control of tiller bud formation and outgrowth. 关键词：RICE TILLER FORMATION MOC3 M0C1 FON1

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Tiller Bud Formation Regulators MOC1 and MOC3 Cooperatively Promote Tiller Bud Outgrowth by Activating F0N1 Expression in Rice

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