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首页> 外文期刊>eLife journal >PCH1 integrates circadian and light-signaling pathways to control photoperiod-responsive growth in Arabidopsis
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PCH1 integrates circadian and light-signaling pathways to control photoperiod-responsive growth in Arabidopsis

机译：PCH1整合了昼夜节律和光信号通路，以控制拟南芥中光周期响应性生长

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Most living things possess an internal “circadian” clock that synchronizes many behaviors, such as eating, resting or growing, with the day-night cycle. With the help of proteins that can detect light, known as photoreceptors, the clock also coordinates these behaviors as the number of daylight hours changes during the year. However, it is not known how the clock and photoreceptors are able to work together. The circadian clocks of animals and plants have evolved separately and use different proteins. In plants, a photoreceptor called phytochrome B responds to red light and regulates the ability of plants to grow. Most plants harness sunlight during the day, but grow fastest in the dark just before dawn. In 2015, researchers identified a new protein in a plant called Arabidopsis that is associated with several plant clock proteins and photoreceptors, including phytochrome B. However, the role of this new protein was not clear. Now, Huang et al. – including many of the researchers from the 2015 work – studied the new protein, named PCH1, in more detail. The experiments show that PCH1 is a critical link that regulates the daily growth of Arabidopsis plants in response to the number of daylight hours. PCH1 stabilizes the structure of phytochrome B so that it remains active, even in the dark. This prolonged activity acts as a molecular memory of prior exposure to light and helps to prevent plants from growing too much in the winter when there are fewer hours of daylight. Since PCH1 is also found in other species of plants, it may play the same role in regulating growth of major crop plants. The next challenge is to understand how the binding of PCH1 to phytochrome B alters the photoreceptor’s activity. In the future, Huang et al. hope to find out if manipulating the activity of PCH1 can improve the growth of crops in places where there is a large change in day length across the seasons.
机译：大多数生物都有一个内部的“昼夜节律”时钟，该时钟使许多行为（如进食，休息或成长）与昼夜周期同步。在可以检测光的蛋白质（称为感光体）的帮助下，时钟还可以随着一年中白天的小时数变化来协调这些行为。然而，未知时钟和感光体如何一起工作。动植物的生物钟已分别进化并使用不同的蛋白质。在植物中，称为植物色素B的感光体对红光作出反应，并调节植物的生长能力。大多数植物在白天利用阳光，但是在黎明前黑暗中生长最快。 2015年，研究人员在一种叫做拟南芥的植物中发现了一种新蛋白，该蛋白与几种植物钟蛋白和光感受器（包括植物色素B）有关。但是，这种新蛋白的作用尚不清楚。现在，黄等人。包括2015年工作的许多研究人员在内，他们更详细地研究了名为PCH1的新蛋白质。实验表明，PCH1是调节拟南芥植物响应日照小时数的每日生长的关键环节。 PCH1稳定了植物色素B的结构，因此即使在黑暗中也能保持活性。这种长时间的活动可作为事先暴露于光线下的分子记忆，有助于防止日光小时数较少的冬季植物过度生长。由于在其他植物物种中也发现了PCH1，因此它在调节主要农作物的生长中可能发挥相同的作用。下一个挑战是了解PCH1与植物色素B的结合如何改变感光细胞的活性。将来，黄等人。希望找出操纵PCH1的活性是否可以改善整个季节中日长变化很大的地方的作物生长。

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