PCH1 integrates circadian and light-signaling pathways to control photoperiod-responsive growth in Arabidopsis

• DOI: 10.7554/elife.13292
• Publication Date: 2016-02-04T06:01:57Z
• Authors: He Huang; Chan Yul Yoo; Rebecca Bindbeutel; Jessica Goldsworthy; Allison Tielking; Sophie Alvarez; Michael J Naldrett; Bradley S Evans; Meng Chen; Dmitri A Nusinow
• Keywords: Phytochrome; Dusk

Plants react to seasonal change in day length through altering physiology and development. Factors that function harmonize growth with photoperiod are poorly understood. Here we characterize a new protein associates both circadian clock photoreceptor components, named PHOTOPERIODIC CONTROL OF HYPOCOTYL1 (PCH1). pch1 seedlings have overly elongated hypocotyls specifically under short days while constitutive expression of PCH1 shortens independent length. peaks at dusk, binds phytochrome B (phyB) red light-dependent manner, co-localizes phyB into photobodies. is necessary sufficient promote the biogenesis large photobodies maintain an active pool after light exposure, potentiating red-light signaling prolonging memory prior illumination. Manipulating alters PHYTOCHROME INTERACTING FACTOR 4 levels regulates light-responsive gene expression. Thus, factor photoperiod-responsive by integrating perception pathways modulating daily phyB-signaling.