title: Phytochromes function as thermosensors in Arabidopsis.
abstract: 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.
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Jae-Hoon
authors: JH
authors: Jung
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Mirela
authors: M
authors: Domijan
authors: Institut für Biologie II, University of Freiburg, D-79104 Freiburg, Germany.
authors: Cornelia
authors: C
authors: Klose
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Surojit
authors: S
authors: Biswas
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Daphne
authors: D
authors: Ezer
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Mingjun
authors: M
authors: Gao
authors: School of Environmental Sciences, University of East Anglia, Norwich, UK.
authors: Asif Khan
authors: AK
authors: Khattak
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Mathew S
authors: MS
authors: Box
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Varodom
authors: V
authors: Charoensawan
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Sandra
authors: S
authors: Cortijo
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Manoj
authors: M
authors: Kumar
authors: School of Environmental Sciences, University of East Anglia, Norwich, UK.
authors: Alastair
authors: A
authors: Grant
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.|Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK.
authors: James C W
authors: JC
authors: Locke
authors: Institut für Biologie II, University of Freiburg, D-79104 Freiburg, Germany.|BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104 Freiburg, Germany.
authors: Eberhard
authors: E
authors: Schäfer
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK.
authors: Katja E
authors: KE
authors: Jaeger
authors: Sainsbury Laboratory, University of Cambridge, Cambridge CB2 1LR, UK. philip.wigge@slcu.cam.ac.uk.|Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, UK.
authors: Philip A
authors: PA
authors: Wigge
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D003624:Darkness; D018506:Gene Expression Regulation, Plant; D053263:Gene Regulatory Networks; D006358:Hot Temperature; D051939:Phytochrome B / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D059467:Transcriptome
chemical_list: D029681:Arabidopsis Proteins; C497952:PHYB protein, Arabidopsis; D014157:Transcription Factors; D051939:Phytochrome B