The Transcription Factors TCP4 and PIF3 Antagonistically Regulate Organ-Specific Light Induction of SAUR Genes to Modulate Cotyledon Opening during De-Etiolation in Arabidopsis

摘要: Light elicits different growth responses in organs of plants. These organ-specific are prominently displayed during de-etiolation. While major light-responsive components and early signaling pathways this process have been identified, information has yet to explain how light achieved. Here, we report that members the TEOSINTE BRANCHED1, CYCLOIDEA, PCF (TCP) transcription factor family participate photomorphogenesis facilitate light-induced cotyledon opening Arabidopsis (Arabidopsis thaliana). Chromatin immunoprecipitation sequencing RNA analyses indicated TCP4 targets a number SMALL AUXIN UPREGULATED (SAUR) genes previously shown exhibit organ-specific, expression. We demonstrate TCP4-like factors, which predominantly expressed cotyledons both light- dark-grown seedlings, activate SAUR16 SAUR50 expression response light. regulates binding promoters SAUR14, SAUR16, through PHYTOCHROME-INTERACTING FACTORs (PIFs). PIF3, accumulates etiolated seedlings its levels rapidly decline upon exposure, also binds promoters, while suppressing these dark. Our study reveals interplay between factors PIFs developmental regulator determines cotyledon-specific regulation SAUR50, contributes closure before after