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Vernalization, the cold-induced acceleration of flowering, involves the epigenetic silencing of the floral repressor gene  FLOWERING LOCUS C  ( FLC ). We investigated the molecular basis for variation in vernalization in  Arabidopsis  natural accessions adapted to different climates. A major variable was the degree to which different periods of cold caused stable  FLC  silencing. In accessions requiring long vernalization,  FLC  expression was reactivated following nonsaturating vernalization, but this reactivation was progressively attenuated with increasing cold exposure. This response was correlated with the rate of accumulation of  FLC  histone H3 Lys 27 trimethylation (H3K27me3). Thus, variation in epigenetic silencing of  FLC  appears to have contributed to  Arabidopsis  adaptation.

Variation in the epigenetic silencing of FLC contributes to natural variation in Arabidopsis vernalization response