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Incorporation of 14C from Acetate and Mevalonate into Rishitin and Steroid Glycoalkaloids by Potato Tuber Slices Inoculated with Phytophthora infestans. M. Shih, Department of Biochemistry, Purdue University, West Lafayette, Indiana 47907; J. Kuc, Department of Biochemistry, Purdue University, West Lafayette, Indiana 47907. Phytopathology 63:826-829. Accepted for publication 6 December 1972. DOI: 10.1094/Phyto-63-826.

The accumulation of steroid glycoalkaloids and rishitin in potato tubers after cutting or cutting and inoculation with Phytophthora infestans appears due to de novo synthesis via the acetate-mevalonate pathway. The branch point in the synthetic pathway which leads to rishitin or the steroid glycoalkaloids appears to be after mevalonate. Uninoculated slices incorporated more 14C from acetate and mevalonate into steroid glycoalkaloids than did slices inoculated with P. infestans. Slices inoculated with an incompatible race incorporated less isotope than those inoculated with a compatible race. Incorporation into rishitin was greatest with inoculated slices and most marked with slices inoculated with the incompatible race.

Additional keywords: late blight, terpenoid biosynthesis.