J Integr Plant Biol ›› 2024, Vol. 66 ›› Issue (4): 771-786.DOI: 10.1111/jipb.13636  cstr: 32098.14.jipb.13636

所属专题： Development； SDGs 目标2: 零饥饿； Rice

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  • 收稿日期:2023-10-18 接受日期:2024-02-19 出版日期:2024-04-01 发布日期:2024-04-13

OsWRKY78 regulates panicle exsertion via gibberellin signaling pathway in rice

Enyang Mei1,2†, Mingliang He1,2†, Min Xu1,2†, Jiaqi Tang1, Jiali Liu3,4, Yingxiang Liu1,2, Zhipeng Hong1,2, Xiufeng Li1, Zhenyu Wang1, Qingjie Guan3,4, Xiaojie Tian1* and Qingyun Bu1*   

  1. 1. State Key Laboratory of Black Soils Conservation and Utilization, Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Key Laboratory of Saline-alkali Vegetation Ecology Restoration, Northeast Forestry University, Ministry of Education, Harbin 150040, China;
    4. College of Life Science, Northeast Forestry University, Harbin 150040, China
    †These authors contributed equally to this work.
    *Correspondences:Xiaojie Tian(tianxiaojie@iga.ac.cn);Qingyun Bu(buqingyun@iga.ac.cn, Dr. Bu is fully responsible for the distributions of all materials associated with this article)
  • Received:2023-10-18 Accepted:2024-02-19 Online:2024-04-01 Published:2024-04-13

Abstract: Panicle exsertion is one of the crucial agronomic traits in rice (Oryza sativa). Shortening of panicle exsertion often leads to panicle enclosure and severely reduces seed production. Gibberellin (GA) plays important roles in regulating panicle exsertion. However, the underlying mechanism and the relative regulatory network remain elusive. Here, we characterized the oswrky78 mutant showing severe panicle enclosure, and found that the defect of oswrky78 is caused by decreased bioactive GA contents. Biochemical analysis demonstrates that OsWRKY78 can directly activate GA biosynthesis and indirectly suppress GA metabolism. Moreover, we found OsWRKY78 can interact with and be phosphorylated by mitogen-activated protein kinase (MAPK) kinase OsMAPK6, and this phosphorylation can enhance OsWRKY78 stability and is necessary for its biological function. Taken together, these results not only reveal the critical function of OsWRKY78, but also reveal its mechanism via mediating crosstalk between MAPK and the GA signaling pathway in regulating panicle exsertion.

Key words: gibberellin, MAPK cascades, OsWRKY78, panicle exsertion, rice

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