Molecular convergence of clock and photosensory pathways through PIF3-TOC1 interaction and co-occupancy of target promoters.

ABSTRACT: A mechanism for integrating light perception and the endogenous circadian clock is central to a plant's capacity to coordinate its growth and development with the prevailing daily light/dark cycles. Under short-day (SD) photocycles, hypocotyl elongation is maximal at dawn, being promoted by the collective activity of a quartet of transcription factors, called PIF1, PIF3, PIF4, and PIF5 (phytochrome-interacting factors). PIF protein abundance in SDs oscillates as a balance between synthesis and photoactivated-phytochrome-imposed degradation, with maximum levels accumulating at the end of the long night. Previous evidence shows that elongation under diurnal conditions (as well as in shade) is also subjected to circadian gating. However, the mechanism underlying these phenomena is incompletel

SUBMITTER: Soy J 

PROVIDER: S-EPMC4855547 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature