Acts with JAG to promote growth and patterning in stamens and carpels. Promotes the growth of the abaxial and adaxial sides of floral organs. Promotes the growth of the pollen-bearing microsporangia in anthers, the carpel walls of the gynoecium and the establishment of the correct number of cell layers in carpel walls. Promotes leaf blade growth and trichome development. Expressed in the emerging leaf, stamen and carpel primordia. Not expressed in the apical shoot meristem (SAM). No visible phenotype under normal growth condition.