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Temporal-Specific Interaction of NF-YC and CURLY LEAF during the Floral Transition Regulates Flowering.

Plant Physiol.2018 May;177(1):105-114. Epub 2018 Mar 29
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摘要


The flowering time of higher plants is controlled by environmental cues and intrinsic signals. In Arabidopsis (Arabidopsis thaliana), flowering is accelerated by exposure to long-day conditions via the key photoperiod-induced factor FLOWERING LOCUS T (FT). Nuclear Factor-Y subunit C (NF-YC) proteins function as important mediators of epigenetic marks in different plant developmental stages and play an important role in the regulation of FT transcription, but the mechanistic details of this remain unknown. In this study, we show that Arabidopsis NF-YC homologs temporally interact with the histone methyltransferase CURLY LEAF (CLF) during the flowering transition. The binding of NF-YC antagonizes the association of CLF with chromatin and the CLF-dependent deposition of H3 lysine-27 trimethylation, thus relieving the repression of FT transcription and facilitating flowering under long-day conditions. Our findings reveal a novel mechanism of NF-YC/CLF-mediated epigenetic regulation of FT activation in photoperiod-induced flowering and, consequently, contribute to our understanding of how plants control developmental events in a temporal-specific regulatory manner.

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