Journal of Integrative Agriculture ›› 2024, Vol. 23 ›› Issue (9): 2898-2910.DOI: 10.1016/j.jia.2023.06.018

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水稻细胞色素c氧化酶亚基5B基因OsCOX5B自然变异通过能量调控种子活力

  

  • 收稿日期:2023-04-18 接受日期:2023-05-23 出版日期:2024-09-20 发布日期:2024-08-19

Natural variation in the cytochrome c oxidase subunit 5B OsCOX5B regulates seed vigor by altering energy production in rice

Chengwei Huang1*, Zhijuan Ji2, 3*, Qianqian Huang1, Liling Peng1, Wenwen Li1, Dandan Wang1, Zepeng Wu1, Jia Zhao1, Yongqi He1#, Zhoufei Wang1#   

  1. 1 Laboratory of Seed Science and Technology/Guangdong Key Laboratory of Plant Molecular Breeding/State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources/South China Agricultural University, Guangzhou 510642, China
    2 National Nanfan Research Institute (Sanya), Chinese Academy of Agricultural Sciences, Sanya 572025
    3 China National Rice Research Institute, Hangzhou 310006, China
  • Received:2023-04-18 Accepted:2023-05-23 Online:2024-09-20 Published:2024-08-19
  • About author:Chengwei Huang, E-mail: huangcw2019@stu.scau.edu.cn; Zhijuan Ji, E-mail: zhijuanji@126.com; #Correspondence Zhoufei Wang, Tel: +86-20-85280203, E-mail: wangzf@scau.edu.cn; Yongqi He, Tel: +86-20-85280203, E-mail: hyq@scau.edu.cn * These authors contributed equally to this study. * These authors contributed equally to this study.
  • Supported by:

    This work was supported by the Hainan Province Science and Technology Special Fund, China (ZDYF2023XDNY086), the Project of Sanya Yazhou Bay Science and Technology City, China (SCKJ-JYRC-2022-87), the Natural Science Foundation of Guangdong Province, China (2023A1515012052 and 2023A1515012092), the Guangzhou Science and Technology Plan Project, China (2023A04J1452 and 2023A04J0749), and the Double First-class Discipline Promotion Project, China (2021B10564001).

摘要:

种子活力是直播稻生产的重要性状之一。本研究利用全基因组关联分析方法,挖掘控制水稻种子活力性状包括发芽指数(GI)和发芽GP)的遗传因子;鉴定到一个同时控制GIGP的主效位点qGI6/qGP6验证qGI6/qGP6候选基因为细胞色素c氧化酶亚基5B基因OsCOX5B;与野生型(WT粳稻日本晴相比,该基因突变体种子活力显著降低。基因共表达分析表明,OsCOX5B主要通过影响三羧酸循环过程调控种子活力;在种子萌发过程中Oscox5b突变体葡萄糖含量显著高于WT,而丙酮酸和三磷酸腺苷水平显著降低此外,OsCOX5B基因优异单倍型通过增强种子萌发过程中其表达水平促进种子活力。因此,培育适宜直播生产的高活力水稻品种中,OsCOX5B一个具有潜在育种利用价值的重要基因

Abstract:

Seed vigor is a crucial trait for the direct seeding of rice.  Here we examined the genetic regulation of seed vigor traits in rice, including germination index (GI) and germination potential (GP), using a genome-wide association study approach.  One major quantitative trait locus, qGI6/qGP6, was identified simultaneously for both GI and GP.  The candidate gene encoding the cytochrome c oxidase subunit 5B (OsCOX5B) was validated for qGI6/qGP6.  The disruption of OsCOX5B caused the vigor traits to be significantly lower in Oscox5b mutants than in the japonica Nipponbare wild type (WT).  Gene co-expression analysis revealed that OsCOX5B influences seed vigor mainly by modulating the tricarboxylic acid cycle process.  The glucose levels were significantly higher while the pyruvic acid and adenosine triphosphate levels were significantly lower in Oscox5b mutants than in WT during seed germination.  The elite haplotype of OsCOX5B facilitates seed vigor by increasing its expression during seed germination.  Thus, we propose that OsCOX5B is a potential target for the breeding of rice varieties with enhanced seed vigor for direct seeding.


Key words: cytochrome c oxidase ,  natural variation ,  rice ,  seed vigor