Abscisic acid promotes jasmonic acid biosynthesis via a 'SAPK10-bZIP72-AOC' pathway to synergistically inhibit seed germination in rice (Oryza sativa)

文献类型： 外文期刊

第一作者： Wang, Yifeng

作者： Wang, Yifeng;Hou, Yuxuan;Qiu, Jiehua;Wang, Huimei;Wang, Shuang;Tang, Liqun;Tong, Xiaohong;Zhang, Jian;Wang, Shuang

作者机构：

关键词： abscisic acid (ABA); bZIP; jasmonic acid (JA); phosphorylation; rice; seed germination; SnRK2

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）

ISSN： 0028-646X

年卷期： 2020 年 228 卷 4 期

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收录情况： SCI

摘要： Abscisic acid (ABA) and jasmonic acid (JA) both inhibit seed germination, but their interactions during this process remain elusive. Here, we report the identification of a 'SAPK10-bZIP72-AOC' pathway, through which ABA promotes JA biosynthesis to synergistically inhibit rice seed germination. Using biochemical interaction and phosphorylation assays, we show that SAPK10 exhibits autophosphorylation activity on the 177(th)serine, which enables it to phosphorylate bZIP72 majorly on 71(st)serine. The SAPK10-dependent phosphorylation enhances bZIP72 protein stability as well as the DNA-binding ability to the G-boxcis-element ofAOCpromoter, thereby elevating theAOCtranscription and the endogenous concentration of JA. Blocking of JA biosynthesis significantly alleviated the ABA sensitivity on seed germination, suggesting that ABA-imposed inhibition partially relied on the elevated concentration of JA. Our findings shed a novel insight into the molecular networks of ABA-JA synergistic interaction during rice seed germination.

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