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首页> 美国卫生研究院文献>The Plant Cell >Phosphorylation of FAR-RED ELONGATED HYPOCOTYL1 Is a Key Mechanism Defining Signaling Dynamics of Phytochrome A under Red and Far-Red Light in Arabidopsis
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Phosphorylation of FAR-RED ELONGATED HYPOCOTYL1 Is a Key Mechanism Defining Signaling Dynamics of Phytochrome A under Red and Far-Red Light in Arabidopsis

机译：远红加长的Hypocotyyl1的磷酸化是定义拟南芥中红光和远红光下植物色素A信号传导动力学的关键机制。

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摘要

Emerging plants have to adapt to a high ratio of far-red light ()/red light (R) light in the canopy before they reach the -enriched direct sunlight. Phytochrome A (phyA) is the single dominant photoreceptor in young Arabidopsis thaliana seedlings that initiates photomorphogenesis in response to a -enriched environment and transduces increasing signals to early responsive genes. To date, how phyA differentially transmits and signals to downstream genes remains obscure. Here, we present a phyA pathway in which FAR-RED ELONGATED HYPOCOTYL1 (FHY1), an essential partner of phyA, directly guides phyA to target gene promoters and coactivates transcription. Furthermore, we identified two phosphorylation sites on FHY1, Ser-39 and Thr-61, whose phosphorylation by phyA under inhibits phyA signaling at each step of its pathway. Deregulation of FHY1 phosphorylation renders seedlings colorblind to and . Finally, we show that the weaker phyA response resulting from FHY1 phosphorylation ensures the seedling deetiolation process in response to a -enriched light condition. Collectively, our results reveal FHY1 phosphorylation as a key mechanism for / spectrum-specific responses in plants and an essential event for plant adaption to changing light conditions in nature.
机译：新兴植物必须在顶棚中适应高比例的远红光（）/红光（R）光，然后才能到达富含阳光的直射阳光。植物色素A（phyA）是拟南芥幼树幼苗中的单一显性光感受器，可响应富集环境启动光形态发生，并将增加的信号转导至早期响应基因。迄今为止，phyA如何差异化地向下游基因传递信号并仍然不清楚。在这里，我们提出了phyA途径，其中phyA的重要伴侣FAR-RED ELONGATED HYPOCOTYL1（FHY1）直接指导phyA靶向靶基因启动子并共激活转录。此外，我们在FHY1，Ser-39和Thr-61上鉴定了两个磷酸化位点，它们在phyA的磷酸化作用下在其通路的每个步骤均抑制phyA信号传导。 FHY1磷酸化的失调节使幼苗对和致盲。最后，我们表明由FHY1磷酸化引起的较弱的phyA反应确保了幼苗在富光条件下的脱化过程。总的来说，我们的结果表明FHY1磷酸化是植物中针对/光谱特异性反应的关键机制，并且是植物适应自然光条件变化的重要事件。

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