数字农科院2.0

BRASSINAZOLE RESISTANT 1 delays photoperiodic flowering by repressing CONSTANS transcription

文献类型： 外文期刊

作者： Xu, Xingwen;Jiang, Wenbo;Chen, Yangbo;Tian, Hao;Yang, Zijian;Liu, Shuo;Li, Xiaopeng;Song, Chunhui;Ye, Zhangli;Guo, Wei;Kong, Dongdong;Hou, Congcong;Li, Legong;Liu, Liangyu

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期刊名称： PLANT PHYSIOLOGY

ISSN： 0032-0889

年卷期： 2025 年 197 卷 2 期

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收录情况： SCIE（2025版）

摘要： Photoperiodic regulation of flowering time plays a critical role in plant reproductive success and crop yield. In Arabidopsis thaliana, the expression of the CONSTANS (CO) gene is closely regulated by day length and is modulated by both environmental and endogenous cues for precise control over flowering. Our findings reveal that the phytohormone brassinosteroid (BR) pathway represses flowering by inhibiting the expression of both CO and Flowering Locus T (FT). Additionally, we discovered that BRASSINAZOLE RESISTANT 1 (BZR1), a key transcription factor in the BR signaling pathway, directly binds to the proximal promoter region of CO to suppress its transcription during long days, thus regulating photoperiodic flowering. Genetically, BZR1 acts upstream of CO and FT to delay floral initiation depending on day length. Overall, our study reveals how a molecular module comprising BZR1-CO integrates signals from BR as well as photoperiodicity for appropriate adjustment of flowering time. BRASSINAZOLE RESISTANT 1, a key transcription factor in brassinosteroid signaling, represses CONSTANS expression under long-day growth conditions to modulate photoperiodic flowering.

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