OsNAC2 regulates seed dormancy and germination in rice by inhibiting ABA catabolism

文献类型： 外文期刊

第一作者： Zhao, Fankai

作者： Zhao, Fankai;Ma, Qun;Li, Yingjiang;Jiang, Meihe;Meng, Shuan;Peng, Yan;Ye, Nenghui;Liu, Bohan;Zhao, Fankai;Li, Yingjiang;Jiang, Meihe;Meng, Shuan;Peng, Yan;Zhang, Jianhua;Ye, Nenghui;Liu, Bohan;Zhou, Zhongjing;Zhang, Jianhua;Zhang, Jianhua;Zhang, Jianhua;Ma, Qun;Ye, Nenghui

作者机构：

关键词： OsNAC2; CRISPR/Cas9; ABA metabolism; Dormancy; Germination; Rice

期刊名称：BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS （ 影响因子：3.1； 五年影响因子：3.2 ）

ISSN： 0006-291X

年卷期： 2023 年 682 卷

页码：

收录情况： SCI

摘要： Seed dormancy and germination determine the beginning of the life cycle of plants, and the phytohormone ABA plays a crucial role in regulation of seed dormancy and germination. However, the upstream regulatory mech-anism of ABA metabolism during dormancy releasing is still remain elusive. In this paper, we present a novel mechanism of OsNAC2 in controlling ABA metabolism and regulation of seed dormancy. OsNAC2 highly expressed during seed development and germination, and overexpression of OsNAC2 strengthened seed dormancy and suppressed germination. Moreover, exogenous phytohormone treatment showed that OsNAC2 acted upstream of GA signaling and downstream of ABA signaling. Additionally, overexpression of OsNAC2 inhibited ABA degradation and increased ABA content during early germination. Further molecular analysis revealed that OsNAC2 directly bound to the ABA metabolism genes promoter and inhibits their transcription in rice protoplasts. These finding could help us explain the genetic regulation mechanism of ABA metabolism during dormancy release and germination in rice.

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