title: Phytochrome B integrates light and temperature signals in Arabidopsis.
abstract: 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.
authors: Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), 1405 Buenos Aires, Argentina.
authors: Martina
authors: M
authors: Legris
authors: Institut für Biologie II, University of Freiburg, Schaenzlestrasse 1, D-79104 Freiburg.
authors: Cornelia
authors: C
authors: Klose
authors: Department of Biology, Washington University in St. Louis, Campus Box 1137, One Brookings Drive, St. Louis, MO 63130, USA.
authors: E Sethe
authors: ES
authors: Burgie
authors: Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), 1405 Buenos Aires, Argentina.
authors: Cecilia Costigliolo Rojas
authors: CC
authors: Rojas
authors: Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), 1405 Buenos Aires, Argentina.
authors: Maximiliano
authors: M
authors: Neme
authors: Institut für Biologie II, University of Freiburg, Schaenzlestrasse 1, D-79104 Freiburg.|BIOSS Centre for Biological Signaling Studies, University of Freiburg, Schaenzlestrasse 18, 79104 Freiburg, Germany.
authors: Andreas
authors: A
authors: Hiltbrunner
authors: Sainsbury Laboratory, Cambridge University, 47 Bateman Street, Cambridge CB2 1LR, UK.
authors: Philip A
authors: PA
authors: Wigge
authors: Institut für Biologie II, University of Freiburg, Schaenzlestrasse 1, D-79104 Freiburg.|BIOSS Centre for Biological Signaling Studies, University of Freiburg, Schaenzlestrasse 18, 79104 Freiburg, Germany.
authors: Eberhard
authors: E
authors: Schäfer
authors: Department of Biology, Washington University in St. Louis, Campus Box 1137, One Brookings Drive, St. Louis, MO 63130, USA.
authors: Richard D
authors: RD
authors: Vierstra
authors: Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), 1405 Buenos Aires, Argentina. casal@ifeva.edu.ar.|Instituto de Investigaciones Fisiológicas y Ecológicas a Vinculadas a la Agricultura (IFEVA), Facultad de Agronomía, Universidad de Buenos Aires and CONICET, Avenida San Martín 4453, 1417 Buenos Aires, Argentina.
authors: Jorge J
authors: JJ
authors: Casal
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development* / Q000528:radiation effects; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D002467:Cell Nucleus / Q000378:metabolism; D006358:Hot Temperature; D008027:Light; D009154:Mutation; D055519:Photoreceptors, Plant / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D051939:Phytochrome B / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D036226:Seedlings / Q000235:genetics / Q000254:growth & development / Q000528:radiation effects
chemical_list: D029681:Arabidopsis Proteins; C497952:PHYB protein, Arabidopsis; D055519:Photoreceptors, Plant; D051939:Phytochrome B