Phytochrome B integrates light and temperature signals in Arabidopsis
Phytochrome B integrates light and temperature signals in Arabidopsis
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DOI：
10.1126/science.aaf5656
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发表时间：
2016-11-18
期刊：
影响因子：
56.9
通讯作者：
Casal, Jorge J.
中科院分区：
文献类型：
--
作者：
Legris, Martina;Klose, Cornelia;Casal, Jorge J.
环境温度调节植物生长发育的许多方面，但其传感器尚不清楚。在这里，我们证明了光敏色素B(PhyB)光感受器通过其依赖温度的从激活的Pfr状态到非激活的Pr状态的回复来参与温度感知。即使在白天，将拟南芥幼苗暴露在温暖的环境中时，增加的热回复速度也会减少PhyB的生物活性PFR-PFR二聚体池的丰度和相关核体的大小。对表达野生型和热稳定变异体的幼苗在不同的光和温度组合下的茎生长进行的数学分析表明，PhyB对这两种信号都有生理反应。因此，我们认为PhyB除了具有感光功能外，还是植物中的温度感受器。
Ambient temperature regulates many aspects of plant growth and development, but its sensors are unknown. Here, we demonstrate that the phytochrome B (phyB) photoreceptor participates in temperature perception through its temperature-dependent reversion from the active Pfr state to the inactive Pr state. Increased rates of thermal reversion upon exposing Arabidopsis seedlings to warm environments reduce both the abundance of the biologically active Pfr-Pfr dimer pool of phyB and the size of the associated nuclear bodies, even in daylight. Mathematical analysis of stem growth for seedlings expressing wild-type phyB or thermally stable variants under various combinations of light and temperature revealed that phyB is physiologically responsive to both signals. We therefore propose that in addition to its photoreceptor functions, phyB is a temperature sensor in plants.