Putative transcription factor that seems to play a central role in the regulation of flowering time in the late-flowering phenotype by interacting with 'FRIGIDA', the autonomous and the vernalization flowering pathways. Inhibits flowering by repressing 'SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1'. At elevated temperatures (e.g. 29 degrees Celsius), maintained at high levels in a JMJ30/JMJ32-dependent manner to prevent extreme precocious flowering (PubMed:25267112). A number of isoforms are produced. According to EST sequences. High expression in the vegetative apex and in root tissue and lower expression in leaves and stems. Not detected in young tissues of the inflorescence. Before fertilization, expressed in ovules, but not in pollen or stamens, of non-vernalized plants. After vernalization, not detected in ovules. Found in shoots of non-flowering plants grown under long-day conditions at days 4 to 15, and in shoots of plants grown under short-day conditions at days 4 to 11 after germination (PubMed:19121105). Expressed in embryos from the early globular stage (PubMed:19121105). FLC is not imprinted and both parental alleles contribute equally to expression in embryos (PubMed:19121105). Expression is repressed during gametogenesis, and is then reactivated after fertilization in embryos (PubMed:19121105). In seedlings, observed in the vasculature of the cotyledons, hypocotyls, and the first pair of leaves (PubMed:18375656). Just prior to flowering, a strong reduction in expression levels occurs in the vasculature (PubMed:18375656). Epigenetically down-regulated by vernalization. Vernalization repression is initiated by VIN3. Repressed by silencing mediated by polycomb group (PcG) protein complex containing EMF1 and EMF2. Up-regulated by HUA2. Down-regulated by VOZ1 and/or VOZ2. Down-regulated by RBG7. Accumulates at elevated temperatures via a JMJ30/JMJ32-mediated epigenetic regulation (e.g. removal of the repressive histone modification H3 lysine 27 trimethylation (H3K27me3)) (PubMed:25267112). Early-flowering phenotype at elevated temperatures (e.g. 29 degrees Celsius) but not at room temperature (e.g. 22 degrees Celsius). Prevention of early flowering by expression of FLC requires methylation of 'Lys-36' of histone H3. Repression of FLC is dependent on histone H3 'Lys-4' methylation which is partly controlled by the lysine-specific demthylase 1 (LSD1) homologs, LDL1, LDL2 and FLD. May also be regulated by the level of histone acetylation.