Arabidopsis DOF Transcription Factors Act Redundantly to Reduce CONSTANS Expression and Are Essential for a Photoperiodic Flowering Response
作者： Lionel Gissot , Nicolas Sauerbrunn , Mark Rühl , José A. Jarillo , George Coupland
DOI: 10.1016/J.DEVCEL.2009.06.015
关键词: Biology 、 Gigantea 、 Transcription (biology) 、 Regulation of gene expression 、 Transcription factor 、 Genetics 、 photoperiodism 、 Gene 、 Arabidopsis 、 Transcriptional regulation
摘要: Flowering of Arabidopsis is induced by long summer days (LDs). The transcriptional regulator CONSTANS (CO) promotes flowering, and its transcription increased under LDs. We systematically misexpressed factors in companion cells identified several DOF proteins that delay flowering repressing CO transcription. Combining mutations four these, including CYCLING FACTOR 2 (CDF2), caused photoperiod-insensitive early increasing mRNA levels. promoted to differing extents GIGANTEA (GI) the F-box protein FKF1. show GI stabilizes FKF1, thereby reducing CDF2 abundance allowing CO. Despite crucial function wild-type plants, introducing DOF-encoding genes into gi mutants restored diurnal rhythm light inducibility Thus, antagonism between contributes photoperiodic modulating an underlying transcript
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