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Jasmonic acid is a well characterized signaling molecule in plant defense responses.However, its function and relationship with other signal molecules in secondary metabolite production induced by endophytic fungus is largely unknown.To research the role of JA in the endophytic fungal promotion of secondary metabolism in Atractylodes lancea plantlets, plantlets were incubated with Gilmaniella sp.ALl2,which induced JA generation and volatile oil accumulation.