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The transcriptional regulator CONSTANS (CO) promotes flowering of  Arabidopsis  under long summer days (LDs) but not under short winter days (SDs). Post‐translational regulation of CO is crucial for this response by stabilizing the protein at the end of a LD, whereas promoting its degradation throughout the night under LD and SD. We show that mutations in CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1), a component of a ubiquitin ligase, cause extreme early flowering under SDs, and that this is largely dependent on CO activity. Furthermore, transcription of the CO target gene  FT  is increased in  cop1  mutants and decreased in plants overexpressing  COP1  in phloem companion cells. COP1 and CO interact  in vivo  and  in vitro  through the C‐terminal region of CO. COP1 promotes CO degradation mainly in the dark, so that in  cop1  mutants CO protein but not  CO  mRNA abundance is dramatically increased during the night. However, in the morning CO degradation occurs independently of COP1 by a phytochrome B‐dependent mechanism. Thus, COP1 contributes to day length perception by reducing the abundance of CO during the night and thereby delaying flowering under SDs.

Arabidopsis COP1 shapes the temporal pattern of CO accumulation conferring a photoperiodic flowering response