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FUNCTION Involved in the production of 12-oxo-phytodienoic acid (OPDA), a precursor of jasmonic acid (JA) (PubMed:14605232, PubMed:23347338). Required for the production of JA in response to wounding (PubMed:14605232, PubMed:18786507). Necessary for flower and coleoptile development regulation by light, including blue (BL), red (RL) and far red (FR) lights (PubMed:14605232, PubMed:15570396, PubMed:23347338). Involved in the auxin-mediated signaling pathway leading to growth stimulation (PubMed:14605232, PubMed:19184094). Essential for photodestruction of phyA upon activation by RL and FR (PubMed:19184094). Implicated in responses to salt stress (NaCl) (PubMed:25873666).FUNCTION 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 (PubMed:23347338). Implicated in riboflavin-induced resistance to the sheath blight Rhizoctonia solani (PubMed:19729221). Required for Pseudomonas fluorescens WCS374r-mediated JA-dependent induced systemic resistance (ISR) against M.oryzae (PubMed:18945932). 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 (PubMed:25239066, PubMed:25627217). 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 (PubMed:25239066, PubMed:25627217, PubMed:26025049).CATALYTIC ACTIVITY (9Z,13S,15Z)-12,13-epoxyoctadeca-9,11,15-trienoate = (9S,13S,15Z)-12-oxophyto-10,15-dienoatePATHWAY Lipid metabolism; polyunsaturated fatty acid biosynthesis.SUBCELLULAR LOCATION Expressed in leaf sheath, flag leaf, first leaf and, at high levels, in panicles.DEVELOPMENTAL STAGE Accumulates progressively in panicles before and after heading with highest levels at maturity (pollination stage).INDUCTION By wounding and jasmonic acid (JA) (PubMed:14559225, PubMed:18786507, PubMed:25239066, Ref.1). Up-regulated transiently by salicylic acid (SA), ethylene (ET), abscisic acid (ABA), and hydrogen peroxide H(2)O(2). Also triggered by chitosan (CT, a fungal elicitor), heavy metals (e.g. copper Cu, cadmium Cd and mercury Hg) and protein phosphatase (PP) inhibitors (e.g. cantharidin CN, endothall EN and okadaic acid OA). Accumulates at lower levels in darkness than in light conditions. Follows a circadian rhythm (Ref.1). Induced by brown planthopper (BPH, Nilaparvata lugens) (PubMed:25239066).DISRUPTION PHENOTYPE In cpm2 and hebiba mutants, impaired jasmonic acid biosynthesis. Flower morphological abnormalities and early flowering. Slight increased susceptibility to incompatible strains of the blast fungus Magnaporthe grisea with higher hyphal growth and impaired phytoalexins (e.g. sakuranetin) production (PubMed:23347338). However, normal sensitivity to compatible strains of M.grisea (PubMed:18786507, PubMed:23347338). Impaired jasmonic acid accumulation in response to wounding (PubMed:14605232, PubMed:18786507, PubMed:23347338). In cpm2 and hebiba mutants, inversed response to light characterized by long-coleoptile phenotype under continuous white (WL), red (RL), far-red (FR) and blue (BL) lights due to impaired photoinhibition of coleoptile elongation, and short-coleoptile in darkness (PubMed:14605232, PubMed:19184094, PubMed:23347338). In the dark, long mesocotyl and short coleoptile associated with protochlorophyllides accumulation (PubMed:14605232, PubMed:15570396). In continuous far red (FRc) light: short mesocotyl and long coleoptile associated with a less pronounced reduction of phyA levels and no shift of the ratio between phyA' and phyA'' and abnormal induction of Pchlide(655) accumulation (PubMed:15570396). Delayed photodestruction of phyA upon activation by RL and FR lights (PubMed:19184094). In etiolated seedlings, higher levels of abscisic acid (ABA) but reduced levels of auxin indolyl-3-acetic acid (IAA) compensed by a strongly enhanced sensitivity to auxin on growth stimulation. Adult mutant plants exhibit excessive light green leaf growth, not erected but hanging downwards and even creeping along the soil. Impaired accumulation of basal O-phytodienoic acid (OPDA) and apical JA in response to red light and wounding. Altered induction of OPR by red light (PubMed:14605232). Reduced male fertility leading to almost sterility with only a few fertile seeds in each panicle (PubMed:14605232, PubMed:23347338). Abnormal flower development characterized by sterile long lemmas, and sometimes elongated palea with additional bract-like organs between the lemma and palea as well as additional anthers and pistils (PubMed:23347338). Early flowering time (heading) (PubMed:14605232, PubMed:23347338). All these symptoms are rescued by exogenous methyl jasmonate (PubMed:14605232, PubMed:19184094). Impaired in Pseudomonas fluorescens WCS374r-mediated induced systemic resistance (ISR) against M.oryzae (PubMed:18945932). Reduced levels of PAL and lignin. Altered riboflavin-induced resistance to Rhizoctonia solani (PubMed:19729221). Reduced sensitivity to salt (NaCl) stress due to a better scavenging of reactive oxygen species (ROS), thus enhancing antioxidative power; lower accumulate of Na(+) ions in shoots but not in roots (PubMed:25873666). Increased sensitivity to the root feeder insect rice water weevil Lissorhoptrus oryzophilus (PubMed:25627217). Severe susceptibility to the root hemiparasite witchweed Striga hermonthica (PubMed:26025049).MISCELLANEOUS 'Hebiba' means snake leaf in Japanese.SIMILARITY Belongs to the allene oxide cyclase family.
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