Alpha-dioxygenase that catalyzes the primary oxygenation of fatty acids into oxylipins. May be involved in the senescence process. Expressed in seedlings (cotyledons, young leaves, and hypocotyls), flowers, siliques and old leaves. Accumulates progressively during senescence induced by detachment of leaves. In flowers, expressed in anthers and ovules prior to fertilization, and in siliques, present in developing seeds. Belongs to the peroxidase family.