A QTL GN1.1, encoding FT-L1, regulates grain number and yield by modulating polar auxin transport in rice

作     者：Huai-Yu Zhao Jun-Xiang Shan Wang-Wei Ye Nai-Qian Dong Yi Kan Yi-Bing Yang Hong-Xiao Yu Zi-Qi Lu Shuang-Qin Guo Jie-Jie Lei Ben Liao Hong-Xuan Lin 

作者机构：National Key Laboratory of Plant Molecular GeneticsCAS Center for Excellence in Molecular Plant SciencesShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China University of the Chinese Academy of SciencesBeijing 100049China Guangdong Laboratory for Lingnan Modern AgricultureGuangzhou 510642China School of Life Science and TechnologyShanghaiTech UniversityShanghai 201210China 

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

年 卷 期：2024年第66卷第10期

页      面：2158-2174页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：supported by grants from the Scientific and Technological Innovation 2030 (2023ZD040680109) the National Natural Science Foundation of China (32388201) the Laboratory of Lingnan Modern Agriculture Project (NT2021002) the Chinese Academy of Sciences (159231KYSB20200008) the CAS-Croucher Funding Scheme for Joint Laboratories the National Key Laboratory of Plant Molecular Genetics 

主　　题：auxin GN1.1 grain number OsZAC QTL mapping 

摘      要：Rice grain number is a crucial agronomic trait impacting yield. In this study, we characterized a quantitative trait locus(QTL), GRAIN NUMBER 1.1(GN1.1), which encodes a Flowering Locus T-like1(FT-L1) protein and acts as a negative regulator of grain number in rice. The elite allele GN1.1^(B),derived from the Oryza indica variety, BF3-104,exhibits a 14.6% increase in grain yield compared with the O. japonica variety, Nipponbare, based on plot yield tests. We demonstrated that GN1.1 interacted with and enhanced the stability of ADP-ribosylation factor(Arf)-GTPase-activating protein(Gap), OsZAC. Loss of function of OsZAC results in increased grain number. Based on our data, we propose that GN1.1^(B)facilitates the elevation of auxin content in young rice panicles by affecting polar auxin transport(PAT) through interaction with OsZAC. Our study unveils the pivotal role of the GN1.1 locus in rice panicle development and presents a novel, promising allele for enhancing rice grain yield through genetic improvement.