DELLA proteins physically interact with CONSTANS to regulate flowering under long days in Arabidopsis
DELLA proteins physically interact with CONSTANS to regulate flowering under long days in Arabidopsis
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DOI：
10.1002/1873-3468.12076
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发表时间：
2016-02
期刊：
影响因子：
3.5
通讯作者：
Feng Xu;Ting Li;Pengbo Xu;Ling Li;Shasha Du;Hong-Li Lian;Hongquan Yang
中科院分区：
文献类型：
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作者：
Feng Xu;Ting Li;Pengbo Xu;Ling Li;Shasha Du;Hong-Li Lian;Hongquan Yang
适当的开花时间对植物的繁殖是必不可少的。虽然众所周知，光和赤霉素（GA）信号在促进拟南芥开花中起着关键作用，但它们是否以及如何整合以调节开花仍然是未知的。在这里，我们通过生物化学研究表明DELLA蛋白与CONSTANS（CO）发生物理相互作用。此外，CO与NF-YB 2的相互作用被DELLA蛋白RGA抑制。我们的研究结果表明，在长日照条件下，叶片中GA信号对开花的调节至少部分是通过DELLA蛋白对CO的抑制来介导的，DELLA蛋白是GA信号通路中的关键组分，而CO是光周期信号通路中的关键开花激活剂。
Proper timing of flowering is essential for reproduction of plants. Although it is well known that both light and gibberellin (GA) signaling play critical roles in promoting flowering in Arabidopsis thaliana, whether and how they are integrated to regulate flowering remain largely unknown. Here, we show through biochemical studies that DELLA proteins physically interact with CONSTANS (CO). Furthermore, the interaction of CO with NF‐YB2 is inhibited by the DELLA protein, RGA. Our findings suggest that regulation of flowering by GA signaling in leaves under long days is mediated, at least in part, through repression of DELLA proteins on CO, providing a molecular link between DELLA proteins, key components in GA signaling pathway, and CO, a critical flowering activator in photoperiod signaling pathway.