Transcription factor that may act on the GAL1 promoter (PubMed:12008900). Acts redundantly with MYR2 as a repressor of flowering and organ elongation under decreased light intensity (PubMed:21255164). Represses gibberellic acid (GA)-dependent responses and affects levels of bioactive GA (PubMed:21255164). Isoforms 1 and 2: homodimer. Isoform 3: loss of dimerization. Expressed in phloem and/or cambium. No visible phenotype when grown under long days conditions, but early flowering when grown under short days conditions. Belongs to the MYB-CC family.