BTA2 regulates tiller angle and the shoot gravity response through controlling auxin content and distribution in rice

作     者：Zhen Li Junhua Ye Qiaoling Yuan Mengchen Zhang Xingyu Wang Jing Wang Tianyi Wang Hongge Qian Xinghua Wei Yaolong Yang Lianguang Shang Yue Feng 

作者机构：China National Center for Rice ImprovementState Key Laboratory of Rice Biology and BreedingChina National Rice Research InstituteHangzhou 310006China Shenzhen BranchGuangdong Laboratory of Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518124China National Nanfan Research Institute(Sanya)Chinese Academy of Agricultural SciencesSanya 572024China 

出 版 物：《Journal of Integrative Plant Biology》 (植物学报（英文版）)

年 卷 期：2024年第66卷第9期

页      面：1966-1982页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：supported by the Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City(2021JJLH0045) the Natural Science Foundation of Zhejiang Province(LTGN23C130001) National Key R&D Program of China(2020YFE0202300) the Key Research and Development Program of Zhejiang Province(2021C02056) the Agricultural Science and Technology Innovation Program(CAAS‐ASTIP‐2013‐CNRRI) 

主　　题：auxin domestication gravity response rice tiller angle 

摘      要：Tiller angle is a key agricultural trait that establishes plant architecture,which in turn strongly affects grain yield by influencing planting density in *** shoot gravity response plays a crucial role in the regulation of tiller angle in rice,but the underlying molecular mechanism is largely ***,we report the identification of the BIG TILLER ANGLE2(BTA2),which regulates tiller angle by controlling the shoot gravity response in ***-of-function mutation of BTA2 dramatically reduced auxin content and affected auxin distribution in rice shoot base,leading to impaired gravitropism and therefore a big tiller ***2 interacted with AUXIN RESPONSE FACTOR7(ARF7)to modulate rice tiller angle through the gravity signaling *** BTA2 protein was highly conserved during *** variation in the BTA2 promoter of indica cultivars harboring a less expressed BTA2 allele caused lower BTA2 expression in shoot base and thus wide tiller angle during rice *** of BTA2 significantly increased grain yield in the elite rice cultivar Huanghuazhan under appropriate dense planting *** findings thus uncovered the BTA2-ARF7 module that regulates tiller angle by mediating the shoot gravity *** work offers a target for genetic manipulation of plant architecture and valuable information for crop improvement by producing the ideal plant type.