Cells in leaf primordia become determinate

Cells in the primordia are functionally distinct from those in the meristem. They become determinate. ARP genes :“ARP” is derived from three genes, ASYMMETRIC LEAF1, ROUGH SHEATH2, and PHANTASTICA. ARP genes encode MYB transcription factors. Expressed in cells of leaf primordia. Promote determinate growth and differentiation. Promotes leaf primordium development and represses meristem identity.