Acts a positive regulator of leaf senescence and may mediate auxin-induced leaf senescence (PubMed:23250625). Plays a role in the regulation of seed germination by gibberellins and abscisic acid (ABA). Plays a role in the regulation of light-dependent hypocotyl elongation (PubMed:23503980). Expressed in embryo, endosperm, growing hypocotyls and shoot apical meristems. By senescence (PubMed:14617064, PubMed:23250625). Induced by auxin (PubMed:23250625, PubMed:23503980). Down-regulated by gibberellin (PubMed:23503980). Increased leaf size and delayed senescence. Belongs to the ARG7 family.