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Significance The exogenous light signal and the endogenous circadian clock are two critical factors for directing growth and development in plants. In this study, we characterized a previously unidentified positive regulator of light signaling, CSU4. CSU4 interacts with CCA1, a key component of the circadian clock, to inhibit its transcriptional repression activity. Being a transcriptional regulator, CSU4 repressesCCA1 in the early morning andPIF4 in the early evening in gating hypocotyl elongation. Thus, CSU4 likely acts as a key regulator of light- and circadian clock-mediated hypocotyl growth in plants.

COP1 SUPPRESSOR 4 promotes seedling photomorphogenesis by repressing CCA1 and PIF4 expression in Arabidopsis