DHD4, a CONSTANS-like family transcription factor, delays heading date by affecting the formation of the FAC complex in rice

文献类型： 外文期刊

第一作者： Cai, Maohong

作者： Cai, Maohong;Zhu, Shanshan;Zheng, Xiaoming;Li, Chaonan;Zhang, Xinyue;Jin, Xin;Cheng, Zhijun;Zhang, Xin;Lei, Cailin;Ren, Yulong;Lin, Qibing;Guo, Xiuping;Zhao, Lei;Wang, Jie;Zhao, Zhichao;Wang, Haiyang;Wan, Jianmin;Cai, Maohong;Wu, Mingming;Wang, Jiachang;Zhou, Liang;Zheng, Tianhui;Cui, Song;Zhou, Shirong;Zhang, Huan;Chai, Juntao;Jiang, Ling

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关键词： rice; Oryza sativa; delayed heading date 4; DHD4; minor-effect; OsFD1; heading date

期刊名称：MOLECULAR PLANT （ 影响因子：13.164； 五年影响因子：16.357 ）

ISSN： 1674-2052

年卷期： 2021 年 14 卷 2 期

页码：

收录情况： SCI

摘要： Heading date (or flowering time) is one of the most important agronomic traits in rice, influencing its regional adaptability and crop yield. Many major-effect genes for rice heading date have been identified, but in practice they are difficult to be used for rice molecular breeding because of their dramatic effects on heading date. Genes with minor effects on heading date, which are more desirable for fine-tuning flowering time without significant yield penalty, were seldom reported. In this study, we identified a new minor-effect heading date repressor, Delayed Heading Date 4 (DHD4). The dhd4 mutant shows a slightly earlier flowering phenotype without a notable yield penalty compared with wild-type plants under natural long-day conditions. DHD4 encodes a CONSTANS-like transcription factor localized in the nucleus. Molecular, biochemical, and genetic assays show that DHD4 can compete with 14-3-3 to interact with OsFD1, thus affecting the formation of the Hd3a-14-3-3-OsFD1 triprotein FAC complex, resulting in reduced expression of OsMADS14 and OsMADS15, and ultimately delaying flowering. Taken together, these results shed new light on the regulation of flowering time in rice and provide a promising target for fine-tuning flowering time to improve the regional adaptability of rice.

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