Phytochromes function as thermosensors in Arabidopsis

作者：Jae‐Hoon Jung, Mirela Domijan, Cornelia Klose, Surojit Biswas, Daphne Ezer, Mingjun Gao, Asif Khan Khattak, Mathew S. Box, Varodom Charoensawan, Sandra Cortijo, Manoj Kumar, Alastair Grant, James Locke, Eberhard Schäfer, Katja E. Jaeger, Philip A. Wigge · 发表于：Science · 年份：2016 · DOI：10.1126/science.aaf6005 · 被引用次数：976 · 研究领域：Light effects on plants、Plant Molecular Biology Research、Plant and Biological Electrophysiology Studies

Plants are responsive to temperature, and some species can distinguish differences of 1°C. In Arabidopsis, warmer temperature accelerates flowering and increases elongation growth (thermomorphogenesis). However, the mechanisms of temperature perception are largely unknown. We describe a major 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 associates with 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.