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Two interacting basic helix-loop-helix transcription factors control flowering time in rice

文献类型： 外文期刊

作者： Yin, Yanbin 1 ; Yan, Zhiqiang 1 ; Guan, Jianing 1 ; Huo, Yiqiong 1 ; Wang, Tianqiong 1 ; Li, Tong 1 ; Cui, Zhibo 1 ; Ma, Wenhong 1 ; Wang, Xiaoxue 1 ; Chen, Wenfu 1 ;

作者机构： 1.Shenyang Agr Univ, Rice Res Inst, 120 Dongling Rd, Shenyang 110866, Peoples R China

2.Rice Res Inst, Guizhou Acad Agr Sci, Guiyang 550025, Peoples R China

3.Shanxi Agr Univ, Coll Agr, Jinzhong 030801, Peoples R China

期刊名称：PLANT PHYSIOLOGY （ 影响因子：7.4； 五年影响因子：8.7 ）

ISSN： 0032-0889

年卷期： 2023 年 192 卷 1 期

页码：

收录情况： SCI

摘要： Hd1 binding protein 1 physically interacts with Partner of HBP1 forming complexes to regulate flowering time in rice by binding to the promoter region of Heading date 1 and activating its expression. Flowering time is one of the most important agronomic traits affecting the adaptation and yield of rice (Oryza sativa). Heading date 1 (Hd1) is a key factor in the photoperiodic control of flowering time. In this study, two basic helix-loop-helix (bHLH) transcription factors, Hd1 Binding Protein 1 (HBP1) and Partner of HBP1 (POH1) were identified as transcriptional regulators of Hd1. We generated knockout mutants of HBP1 and ectopically expressed transgenic lines of the two bHLH transcription factors and used these lines to investigate the roles of these two factors in regulating flowering time. HBP1 physically associated with POH1 forming homo- or heterodimers to perform their functions. Both HBP1 and POH1 bound directly to the cis-acting elements located in the promoter of Hd1 to activate its expression. CRISPR/Cas9-generated knockout mutations of HBP1, but not POH1 mutations, promoted earlier flowering time; conversely, HBP1 and POH1 overexpression delayed flowering time in rice under long-day and short-day conditions by activating the expression of Hd1 and suppressing the expression of Early heading date 1 (Ehd1), Heading date 3a (Hd3a), and Rice Flowering locus T 1 (RFT1), thus controlling flowering time in rice. Our findings revealed a mechanism for flowering time control through transcriptional regulation of Hd1 and laid theoretical and practical foundations for improving the growth period, adaptation, and yield of rice.

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