TY  - JOUR
AU  - Hayama, R
AU  - Sarid-Krebs, L
AU  - Richter, R
AU  - Fernandez, V
AU  - Jang, S
AU  - Coupland, G
Y2  - 2020/12/10
Y1  - 2017/04/03
SN  - 0261-4189
UR  - http://hdl.handle.net/11343/253758
AB  - 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 (LDs), and CONSTANS (CO) transcription factor represents a photoperiodic timer whose stability is higher when plants are exposed to light under LDs. Here, we show that PSEUDO RESPONSE REGULATOR (PRR) proteins directly mediate this stabilization. PRRs interact with and stabilize CO at specific times during the day, thereby mediating its accumulation under LDs. 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. PRRs were previously reported to contribute to timekeeping by regulating CO transcription through their roles in the circadian clock. We propose an additional role for PRRs in which they act upon CO protein to promote flowering, directly coupling information on light exposure to the timekeeper and allowing recognition of LDs.
LA  - English
PB  - WILEY
T1  - PSEUDO RESPONSE REGULATORs stabilize CONSTANS protein to promote flowering in response to day length
DO  - 10.15252/embj.201693907
IS  - The EMBO Journal
VL  - 36
IS  - 7
SP  - 904-918
L1  - /bitstream/handle/11343/253758/PMC5376961.pdf?sequence=1&isAllowed=y
ER  -