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. 2016 Nov 18;354(6314):886-889.
doi: 10.1126/science.aaf6005. Epub 2016 Oct 27.

Phytochromes Function as Thermosensors in Arabidopsis

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Phytochromes Function as Thermosensors in Arabidopsis

Jae-Hoon Jung et al. Science. .

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.

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