Plays a pivotal role in the control of morphogenesis of shoot organs by negatively regulating the expression of boundary-specific genes such as CUC genes, probably through the induction of miRNA (e.g. miR164). Participates in ovule develpment (PubMed:25378179). Interacts with SPL. Interacts with KIN10; KIN11 and FLZ3 (Ref.10). Expressed in cotyledons, particularly in the vascular region, in leaves, roots, buds, flowers and immature siliques. First observed in the distal and middle regions of cotyledons of torpedo-shaped embryos. Later localized in bending cotyledon, and mature embryos, but no signals were detected in the presumptive shoot apical meristem (SAM) and the boundary region during embryogenesis. During flower development, first observed throughout the floral meristem. Later expressed in rapidly growing floral primordia. Detected to a lower extent in vegetative primordia. During flower development, first observed throughout the floral meristem. Expressed during ovule development (PubMed:25378179). Truncated N-terminus.