Journal
SCIENCE
Volume 354, Issue 6314, Pages 897-900Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaf5656
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Funding
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 2012-1396, PICT 2013-1444]
- Alexander von Humboldt-Foundation
- Universidad de Buenos Aires [20020100100437]
- Fundacion Rene Baron
- Excellence Initiative of the German Federal Government [EXC 294]
- Excellence Initiative of the German State Government [EXC 294]
- German Research Foundation (DFG) [SCHA 303/16-1, HI 1369/5-1]
- U.S. National Science Foundation [MCB-1329956]
- Biotechnology and Biological Sciences Research Council [BBS/E/J/00000610, BB/I013350/1] Funding Source: researchfish
- BBSRC [BB/I013350/1] Funding Source: UKRI
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [1623935] Funding Source: National Science Foundation
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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.
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