Involved in the production of 12-oxo-phytodienoic acid (OPDA), a precursor of jasmonic acid (JA). Required for the production of JA in response to wounding. Necessary for flower and coleoptile development regulation by light, including blue (BL), red (RL) and far red (FR) lights. Involved in the auxin-mediated signaling pathway leading to growth stimulation. Essential for photodestruction of phyA upon activation by RL and FR. Implicated in responses to salt stress (NaCl). Confers resistance to incompatible strains of the blast fungus Magnaporthe grisea, jasmonic acid (JA) thus playing a significant role in the resistance to fungal infection. Implicated in riboflavin-induced resistance to the sheath blight Rhizoctonia solani. Required for Pseudomonas fluorescens-mediated JA-dependent induced systemic resistance (ISR). Confers some resistance, independently of the JA pathway but probably via OPDA accumulation, to brown planthopper (BPH, Nilaparvata lugens), a destructive, monophagous, piercing-sucking insect, mainly by reducing its feeding activity and survival rate. Triggers resistance to the chewing insect striped stem borer (SSB) Chilo suppressalis, to the root hemiparasite witchweed Striga hermonthica, and to the root feeder insect rice water weevil Lissorhoptrus oryzophilus, in a JA-dependent manner, by attenuating both the growth mass and growth rate of caterpillars. (9Z,13S,15Z)-12,13-epoxyoctadeca-9,11,15-trienoate = (10Z,15Z)-12-oxophytodienoate Lipid metabolism; polyunsaturated fatty acid biosynthesis. Belongs to the allene oxide cyclase family.