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Cloning and Functional Analysis of an Allene Oxide Synthase in Physcomitrella patens

Jasmonic acid (JA) is a plant hormone that plays important roles in a large number of processes in stress adaptation and development in flowering plants. A search of genome database indicated the existence of allene oxide synthase (AOS), an enzyme of JA biosynthesis, in Physcomitrella patens, a model plant among mosses. In this study, the presence of JA was detected in P. patens. The recombinant AOS of P. patens, which was overexpressed in Escherichia coli, showed AOS activity. These data suggest that the octadecanoid pathway also exists in P. patens.