Dawn and photoperiod sensing by phytochrome A.

摘要: In plants, light receptors play a pivotal role in photoperiod sensing, enabling them to track seasonal progression. Photoperiod sensing arises from an interaction between the plant's endogenous circadian oscillator and external cues. Here, we characterize of phytochrome A (phyA) sensing. Our metaanalysis functional genomic datasets identified phyA as principal regulator morning-activated genes, specifically short photoperiods. We demonstrate that PHYA expression is under direct control PHYTOCHROME INTERACTING FACTOR transcription factors, PIF4 PIF5. As result, protein accumulates during night, especially At dawn, activation by results burst gene expression, with consequences for physiological processes such anthocyanin accumulation. The combination complex regulation transcript unique molecular properties make this pathway sensitive detector both dawn photoperiod.