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The repression of Arabidopsis  FLC  expression by vernalization (extended cold) has become a model for understanding polycomb-associated epigenetic regulation in plants. Antisense and sense non-coding RNAs have been respectively implicated in initiation and maintenance of  FLC  repression by vernalization. We show that the promoter and first exon of the  FLC  gene are sufficient to initiate repression during vernalization; this initial repression of  FLC  does not require antisense transcription. Long-term maintenance of  FLC  repression requires additional regions of the gene body, including those encoding sense non-coding transcripts.

Vernalization-Repression of Arabidopsis FLC Requires Promoter Sequences but Not Antisense Transcripts