Probable transcription factor that promotes early floral meristem identity in synergy with APETALA1 and CAULIFLOWER. Is required subsequently for the transition of an inflorescence meristem into a floral meristem (PubMed:28586421). Seems to be partially redundant to the function of APETALA1 and CAULIFLOWER in the up-regulation of LEAFY. Is also required for normal pattern of cell division, expansion and differentiation during morphogenesis of the silique (PubMed:28586421). Probably not required for fruit elongation but instead is required to prevent ectopic activity of IND. Represses SAUR10 expression in stems and inflorescence branches (PubMed:28586421). Homodimer capable of binding to CArG-box sequences. A number of isoforms are produced. According to EST sequences. Vascular tissue of cauline leaves, floral shoot apex and valves of carpels and fruits. Dramatically up-regulated upon the transition from vegetative to reproductive development. Altered cauline leaf shape, abnormal stem development and architecture, including enhanced branching, decreased inflorescence branch angles, and shorter stem and internode lengths. Reduced stems elongation after bolting.