BES1-regulated BEE1 controls photoperiodic flowering downstream of blue light signaling pathway in Arabidopsis
BES1-regulated BEE1 controls photoperiodic flowering downstream of blue light signaling pathway in Arabidopsis
复制标题
BES1 调控的 BEE1 控制拟南芥蓝光信号通路下游的光周期开花
DOI：
10.1111/nph.15866
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发表时间：
2019
期刊：
影响因子：
9.4
通讯作者：
Liu Hongtao
中科院分区：
文献类型：
--
作者：
Wang Fei;Gao Yongshun;Liu Yawen;Zhang Xin;Gu Xingxing;Ma Dingbang;Zhao Zhiwei;Yuan Zhenjiang;Xue Hongwei;Liu Hongtao
BRI1-EMS-Suppressor 1(BES1)在油菜素类固醇(BR)途径中起关键调节作用，促进植物生长。然而，BES1是否参与光周期开花尚不清楚。本文报道BES1是光周期开花的正调控基因，但不能直接与T(FT)基因启动子结合。BR增强表达1(BEE1)是BES1的直接靶标，作用于BES1下游。BEE1也是光周期开花的正调控因子。更重要的是，BEE1通过部分依赖蓝光感受器隐花色素2(CRY2)的方式促进开花，因为它在蓝光下与CRY2发生物理作用。此外，BEE1同时受BRS和蓝光的调节。BES1-BEE1-FT是调控光周期开花的一条新的信号通路。
BRI1-EMS-SUPPRESSOR 1 (BES1) functions as a key regulator in the brassinosteroid (BR) pathway that promotes plant growth. However, whether BES1 is involved in photoperiodic flowering is unknown.Here we report that BES1 acts as a positive regulator of photoperiodic flowering, but it cannot directly bindFLOWERING LOCUS T (FT)promoter.BR ENHANCED EXPRESSION 1 (BEE1)is the direct target of BES1 and acts downstream of BES1. BEE1 is also a positive regulator of photoperiodic flowering. BEE1 binds directly to theFTchromatin to activate the transcription ofFTand promote flowering initiation.More importantly, BEE1 promotes flowering in a blue light photoreceptor CRYPTOCHROME 2 (CRY2) partially dependent manner, as it physically interacts with CRY2 under the blue light. Furthermore, BEE1 is regulated by both BRs and blue light. The transcription of BEE1 is induced by BRs, and the BEE1 protein is stabilized under the blue light.Our findings indicate that BEE1 is the integrator of BES1 and CRY2 mediating flowering, and BES1-BEE1-FT is a new signaling pathway in regulating photoperiodic flowering.