数字农科院2.0

OsCOL10, a CONSTANS-Like Gene, Functions as a Flowering Time Repressor Downstream of Ghd7 in Rice

文献类型： 外文期刊

作者： Tan, Junjie;Jin, Mingna;Wu, Fuqing;Sheng, Peike;Cheng, Zhijun;Wang, Jiulin;Zheng, Xiaoming;Wang, Min;Zhu, Shanshan;Guo, Xiuping;Zhang, Xin;Wang, Haiyang;Wu, Chuanyin;Wan, Jianmin;Tan, Junjie;Sheng, Peike;Liu, Xuanming;Wan, Jianmin;Wang, Jiachang;Chen, Liping;Wang, Chunming;Wan, Jianmin;Tan, Junjie

作者机构：

关键词： Ehd1;Flowering regulation;Heading date;Oryza sativa;Photoperiod response

期刊名称： PLANT AND CELL PHYSIOLOGY

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年卷期：

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收录情况： SCI

摘要： Flowering time, or heading date, is a critical agronomic trait that determines the cropping season and regional adaptability, and ultimately grain yield in rice. A number of genes involved in photoperiodic flowering have been cloned and their roles in modulating expression of the flowering genes have been characterized to a certain extent. However, much less is known about the pathway in transmitting the day length response signal(s) to induce transition to reproductive growth. Here, we report a constitutive flowering repressor OsCOL10, which encodes a member of the CONSTANS-like (COL) family. Transgenic rice plants overexpressing OsCOL10 (driven by a strong promoter or by fusing it to the activation domain of VP64) showed delayed flowering time under both short and long days. OsCOL10 is affected by the circadian clock and is preferentially expressed in leaf mesophyll cells; it is localized to the nucleus and has transcriptional activation activity. Further studies show that OsCOL10 represses the expression of the FT-like genes RFT1 and Hd3a through Ehd1. Transcripts of OsCOL10 are more abundant in plants carrying a functional Ghd7 allele or overexpressing Ghd7 than in Ghd7-deficient plants, thus placing OsCOL10 downstream of Ghd7. Taking these findings together, we conclude that OsCOL10 functions as a flowering time repressor that links Ghd7 and Ehd1 in rice.

分类号： Q945

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