Transcription activator that plays a role in the regulation of cell expansion in leaf and cotyledons tissues. Acts together with GIF1 for the development of appropriate leaf size and shape through the promotion and/or maintenance of cell proliferation activity in leaf primordia. Interacts with GIF1. Strongly expressed in actively growing and developing tissues, such as roots, upper stems, and shoot tips containing the shoot apical meristem (SAM) and flower buds. Also expressed in mature flowers, but weakly expressed in mature stems and leaves. Expressed during the early stages of leaf development and expression decreases with the maturation of the leaf. The QLQ domain and WRC domain may be involved in protein-protein interaction and DNA-binding, respectively. Small and narrow leaves. May be due to intron retention. Belongs to the GRF family.