Transcriptional activator that may activate the transcription of specific genes involved in nitrogen uptake or assimilation (PubMed:15592750). Acts redundantly with MYR1 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). Isoform 1: Homodimer. Isoform 3: Does not form homodimer. In 21% of the cells, localized to one or more spots within the nucleus due to protein aggregation. Expressed in phloem and/or cambium. Up-regulated by nitrogen deficiency. No visible phenotype when grown under long days conditions, but early flowering when grown under short days conditions. Belongs to the MYB-CC family.