Function
Involved in the abaxial cell fate determination during embryogenesis and organogenesis. Regulates the initiation of embryonic shoot apical meristem (SAM) development (PubMed:10323860, PubMed:10331982, PubMed:10457020, PubMed:11812777, PubMed:12417699, PubMed:9878633, Ref.3, Ref.6, PubMed:19837869). Required during flower formation and development, particularly for the patterning of floral organs. Positive regulator of class B (AP3 and PI) activity in whorls 2 and 3. Negative regulator of class B activity in whorl 1 and of SUP activity in whorl 3. Interacts with class A proteins (AP1, AP2 and LUG) to repress class C (AG) activity in whorls 1 and 2. Contributes to the repression of KNOX genes (STM, KNAT1/BP and KNAT2) to avoid ectopic meristems. Binds DNA without sequence specificity. In vitro, can compete and displace the AP1 protein binding to DNA containing CArG box (PubMed:10323860, PubMed:10331982, PubMed:10457020, PubMed:11812777, PubMed:12417699, PubMed:9878633, Ref.3, Ref.6).