J Integr Plant Biol ›› 2024, Vol. 66 ›› Issue (10): 2158-2174.DOI: 10.1111/jipb.13749  cstr: 32098.14.jipb.13749

所属专题： Rice

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  • 收稿日期:2024-02-28 接受日期:2024-07-04 出版日期:2024-10-01 发布日期:2024-10-21

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

Huai‐Yu Zhao1,2, Jun‐Xiang Shan1,3, Wang‐Wei Ye1,3, Nai‐Qian Dong1,3, Yi Kan1,3, Yi‐Bing Yang1, Hong‐Xiao Yu1,2, Zi‐Qi Lu1,4, Shuang‐Qin Guo1,2, Jie‐Jie Lei1,2, Ben Liao1,4 and Hong‐Xuan Lin1,2,3,4*   

  1. 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
    *Correspondence: Hong‐Xuan Lin (hxlin@cemps.ac.cn)
  • Received:2024-02-28 Accepted:2024-07-04 Online:2024-10-01 Published:2024-10-21
  • Supported by:
    This work was 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 and the National Key Laboratory of Plant Molecular Genetics.

Abstract: 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 GN1.1B, 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 GN1.1B 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.

Key words: auxin, GN1.1, grain number, OsZAC, QTL mapping

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