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Dev Cell. 2014 Mar 31;28(6):727-36. doi: 10.1016/j.devcel.2014.01.029. Epub 2014 Mar 6.

Photoperiodic control of the floral transition through a distinct polycomb repressive complex.

Author information

1
Department of Biological Sciences and Temasek Life Sciences Laboratory, National University of Singapore, Singapore 117543, Singapore.
2
Department of Genetics, University of Georgia, Athens, GA 30602, USA.
3
Department of Biological Sciences and Temasek Life Sciences Laboratory, National University of Singapore, Singapore 117543, Singapore; Shanghai Center for Plant Stress Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China. Electronic address: dbshy@nus.edu.sg.

Abstract

Polycomb group (PcG) complexes such as PRC1 mediate transcriptional repression. Here, we show that the plant-specific EMBRYONIC FLOWER1 (EMF1), LIKE HETEROCHROMATIN PROTEIN1, and a histone H3 lysine-4 demethylase form a distinct PcG complex, termed EMF1c, that plays PRC1-like roles and is crucial for regulation of the florigen gene FLOWERING LOCUS T (FT) in Arabidopsis. Long-day photoperiods promote FT expression activation in leaf veins specifically at dusk through the photoperiod pathway to induce Arabidopsis flowering. We found that before dusk and at night, a vascular EMF1c directly represses FT expression to prevent photoperiod-independent flowering, whereas at dusk EMF1 binding to FT chromatin is disrupted by the photoperiod pathway, leading to proper FT activation. Furthermore, a MADS-domain transcription factor and potent floral repressor binds EMF1 to repress FT expression. Our study reveals that the vascular EMF1c integrates inputs from several flowering-regulatory pathways to synchronize flowering time to environmental cues.

PMID:
24613395
DOI:
10.1016/j.devcel.2014.01.029
[Indexed for MEDLINE]
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