2-oxoglutarate-dependent dioxygenase essential for auxin catabolism and maintenance of auxin homeostasis in reproductive organs. Catalyzes the irreversible oxidation of indole-3-acetic acid (IAA) to the biologically inactive 2-oxoindole-3-acetic acid (OxIAA). Binds 1 Fe(2+) ion per subunit. Male sterility and production of parthenocarpic seeds. Increased levels of free IAA in anthers and ovaries. Belongs to the iron/ascorbate-dependent oxidoreductase family.