Phytochromes function as thermosensors in Arabidopsis
Phytochromes function as thermosensors in Arabidopsis
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DOI：
10.1126/science.aaf6005
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发表时间：
2016-11-18
期刊：
影响因子：
56.9
通讯作者：
Wigge, Philip A.
中科院分区：
文献类型：
--
作者：
Jung, Jae-Hoon;Domijan, Mirela;Wigge, Philip A.
植物对温度有反应，有些物种可以区分 1 摄氏度的差异。在拟南芥中，较高的温度会加速开花并增加伸长生长（热形态发生）。然而，温度感知的机制很大程度上是未知的。我们描述了光敏色素（红光受体）在夜间的主要热感应作用。光敏色素无效植物表现出组成性的暖温响应，与此一致，我们在这种背景下表明，暖温转录组在低温下变得去抑制。我们发现光敏色素 B (phyB) 以温度依赖性方式直接与关键靶基因的启动子结合。 phyB 失活的速度与黑暗中的温度成正比，使光敏色素能够充当热计时器，整合整晚的温度信息。
Plants are responsive to temperature, and some species can distinguish differences of 1 degrees C. In Arabidopsis, warmer temperature accelerates flowering and increases elongation growth (thermomorphogenesis). However, themechanisms of temperature perception are largely unknown. We describe amajor thermosensory role for the phytochromes (red light receptors) during the night. Phytochrome null plants display a constitutive warm-temperature response, and consistent with this, we show in this background that the warm-temperature transcriptome becomes derepressed at low temperatures. We found that phytochrome B (phyB) directly associateswith the promoters of key target genes in a temperature-dependent manner. The rate of phyB inactivation is proportional to temperature in the dark, enabling phytochromes to function as thermal timers that integrate temperature information over the course of the night.