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Allene oxide synthase (AOS) is the second enzyme in the biosynthesis of the plant defensive hormone jasmonic acid (JA). In rice, there are two AOSs, OsAOS1 and OsAOS2. However, the role of these two AOS genes in herbivore-induced defenses in rice remains unidentified. We cloned the two rice AOS genes and observed that the transcript level of both  OsAOS1  and  OsAOS2  was enhanced by mechanical wounding, the infestation of the striped stem borer (SSB) ( Chilo suppressalis ) or brown planthopper (BPH) ( Niaparvata lugens ), and treatment with JA; however,  OsAOS1  responded more rapidly to SSB infestation and JA treatment than did  OsAOS2 . The antisense expression of  OsAOS1  (as- aos1 ) or  OsAOS2  (as- aos2 ) decreased levels of SSB- or BPH-induced JA, which, in turn, reduced the production of SSB-induced trypsin protease inhibitor (TrypPI) and volatiles as well as the resistance of rice to SSB. In contrast, BPH preferred to feed and oviposit on wild-type (WT) plants over as- aos1  and as- aos2  plants. Moreover, the survival of BPH nymphs on as- aos1  or as- aos2  lines was significantly lower than on WT plants. The increased resistance of as- aos1  or as- aos2  plants to BPH correlated with higher levels of BPH-induced H 2 O 2  and SA. These results indicate that  OsAOS1  and  OsAOS2  are both involved in herbivore-induced JA biosynthesis and play a vital role in determining the resistance of rice to chewing and phloem-feeding herbivores.

Both Allene Oxide Synthases Genes Are Involved in the Biosynthesis of Herbivore-Induced Jasmonic Acid and Herbivore Resistance in Rice