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Seasonal reproduction in many organisms requires detection of day length. This is achieved by integrating information on the light environment with an internal photoperiodic time‐keeping mechanism.  Arabidopsis thaliana  promotes flowering in response to long days ( LD s), and  CONSTANS  ( CO ) transcription factor represents a photoperiodic timer whose stability is higher when plants are exposed to light under  LD s. Here, we show that  PSEUDO RESPONSE REGULATOR  ( PRR ) proteins directly mediate this stabilization.  PRR s interact with and stabilize  CO  at specific times during the day, thereby mediating its accumulation under  LD s.  PRR ‐mediated stabilization increases binding of  CO  to the promoter of   FLOWERING LOCUS  T  (  FT  ), leading to enhanced   FT   transcription and early flowering under these conditions.  PRR s were previously reported to contribute to timekeeping by regulating   CO   transcription through their roles in the circadian clock. We propose an additional role for  PRR s in which they act upon  CO  protein to promote flowering, directly coupling information on light exposure to the timekeeper and allowing recognition of  LD s.

PSEUDO RESPONSE REGULATORs stabilize CONSTANS protein to promote flowering in response to day length