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Phytochrome B integrates light and temperature signals in Arabidopsis

Colaborador(es): Legris, Martina. CONICET - Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires. Buenos Aires, Argentina | Klose, Cornelia. University of Freiburg. Institut für Biologie II. Freiburg. Germany | Sethe Burgie, E. Washington University. Department of Biology. St. Louis, USA | Costigliolo Rojas, Cecilia. CONICET - Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires. Buenos Aires, Argentina | Neme, Maximiliano. CONICET - Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires. Buenos Aires, Argentina | Hiltbrunner, Andreas. University of Freiburg. Institut für Biologie II. Freiburg. Germany. University of Freiburg. Centre for Biological Signaling Studies (BIOSS). Freiburg, Germany | Wigge, Philip A. Cambridge University. Sainsbury Laboratory. Cambridge, UK | Schäfer, Eberhard. University of Freiburg. Institut für Biologie II. Freiburg. Germany. University of Freiburg. Centre for Biological Signaling Studies (BIOSS). Freiburg, Germany | Vierstra, Richard D. Washington University. Department of Biology. St. Louis, USA | Casal, Jorge José. CONICET - Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires. Buenos Aires, Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
ISSN: 1095-9203.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): DIMER | PHYTOCHROME B | ARABIDOPSIS PROTEIN | PHYB PROTEIN | ARABIDOPSIS | PHYTOCHROME B | VISUAL PROTEINS AND PIGMENTS | CELL NUCLEUS | HOT TEMPERATURE | LIGHT | MUTATION | PHOTORECEPTORS, PLANT | PHYTOCHROME B | SEEDLINGS | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Science Vol.354, no.6314 (2016), p.897-900, tbls., grafs.Resumen: 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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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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