Auxin response factors (ARFs) are transcriptional factors that bind specifically to the DNA sequence 5'-TGTCTC-3' found in the auxin-responsive promoter elements (AuxREs). Could act as transcriptional activator or repressor. Formation of heterodimers with Aux/IAA proteins may alter their ability to modulate early auxin response genes expression. Promotes flowering, stamen development, floral organ abscission and fruit dehiscence. Functions independently of ethylene and cytokinin response pathways. May act as a repressor of cell division and organ growth. Homodimers and heterodimers. Interacts with ARF1. A number of isoforms are produced. According to EST sequences. Expressed in the whole plant. Expressed in the sepals and carpels of young flower buds. At stage 10 of flower development, expression in the carpels becomes restricted to the style. Also expressed in anthers and filaments. At stage 13, expressed in the region at the top of the pedicel, including the abscission zone. Expressed in developing siliques. Interactions between auxin response factors (ARFs) and Aux/IAA proteins occur through their C-terminal dimerization domains III and IV. Large, dark green rosette leaves, delayed flowering, thick and long inflorescence, abnormal flower morphology and sterility in early formed flowers, but fertility in late-formed flowers. Delayed senescence and abscission. Increased seed size and weight, and extra cell division and expansion in many organs. Belongs to the ARF family. Was originally (Ref.5) erroneously termed IAA26 and IAA30.