Characteristic Incorporation of Fatty Acids into Lower Terpenoids in Cotyledons of Perilla frutescens

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Incorporation of ¹⁴C-labeled sucrose, acetate, butyrate, and mevalonate into the terpenoid components of essential oils was examined using the detached cotyledons and foliage leaf discs of Perilla frutescens. Althought the radioactivity of sucrose administered was incorporated into the mono- and sesquiterpenoids of both tissues, that of acetate or butyrate was hardly detectable in the lower terpenoids of any foliage leaves except cotyledons. These results suggest that the conversion of acetyl CoA derived from fatty acids into lower terpenoids in the cotyledons does not occur in the foliage leaves.