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 

机构地区：[1]National Key Laboratory of Plant Molecular Genetics,CAS Center for Excellence in Molecular Plant Sciences,Shanghai Institute of Plant Physiology and Ecology,Chinese Academy of Sciences,Shanghai 200032,China [2]University of the Chinese Academy of Sciences,Beijing 100049,China [3]Guangdong Laboratory for Lingnan Modern Agriculture,Guangzhou 510642,China [4]School of Life Science and Technology,ShanghaiTech University,Shanghai 201210,China

出　　处：《Journal of Integrative Plant Biology》2024年第10期2158-2174,共17页植物学报（英文版）

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。

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.

关 键 词：AUXIN GN1.1 grain number OsZAC QTL mapping 

分 类 号：S511[农业科学—作物学]