The evening complex coordinates environmental and endogenous signals in $Arabidopsis$
Résumé
Plants maximize their fitness by adjusting their growth and development in response to signals such as light and
temperature. The circadian clock provides a mechanism for plants to anticipate events such as sunrise and adjust their
transcriptional programmes. However, the underlying mechanisms by which plants coordinate environmental signals with
endogenous pathways are not fully understood. Using RNA-sequencing and chromatin immunoprecipitation sequencing
experiments, we show that the evening complex (EC) of the circadian clock plays a major role in directly coordinating the
expression of hundreds of key regulators of photosynthesis, the circadian clock, phytohormone signalling, growth and
response to the environment. We find that the ability of the EC to bind targets genome-wide depends on temperature. In
addition, co-occurrence of phytochrome B (phyB) at multiple sites where the EC is bound provides a mechanism for
integrating environmental information. Hence, our results show that the EC plays a central role in coordinating endogenous
and environmental signals in $Arabidopsis$.
Mots clés
EARLY FLOWERING 3 (ELF3)
Evening complex (EC)
Transcription factor
Transcriptional Regulation
Plant
Arabidopsis thaliana
Growth
Phytohormone signalling
Light signalling
Photosynthesis
Temperature response
Gene expression
EARLY FLOWERING 4 (ELF4)
LUX ARRYTHMO (LUX)
PHYTOCHROME INTERACTING FACTOR 4 (PIF4)