Photoperiodic control of the Arabidopsis proteome reveals a translational coincidence mechanism

摘要: Plants respond to seasonal cues such as the photoperiod, adapt current conditions and prepare for environmental changes in season come. To assess photoperiodic responses at protein level, we quantified proteome of model plant Arabidopsis thaliana by mass spectrometry across four photoperiods. This revealed coordinated abundance proteins photosynthesis, primary secondary metabolism, including pigment biosynthesis, consistent with higher metabolic activity long Higher translation rates day than night likely contribute these changes, via an interaction rhythmic RNA abundance. Photoperiodic control levels might be greatest only if high coincide transcript some We term this proposed mechanism "translational coincidence", mathematically its components, demonstrate effect on proteome. Datasets from a green alga cyanobacterium suggest that translational coincidence contributes many phototrophic organisms. may explain why transcripts but not their cognate exhibit diurnal rhythms.