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Phytochrome Is Involved in the Light-Regulation of Vindoline Biosynthesis in Catharanthus¹

Institut de Recherche en Biologie Végétale, Université de Montréal, 4101 Sherbrooke est, Montréal, Québec, Canada, H1X 2B2

The enzyme acetylcoenzyme A:deacetylvindoline 4-O-acetyl-transferase (DAT) catalyzes the final step in the biosynthesis of the monoterpenoid indole alkaloid, vindoline. Previous studies have shown that the appearance of DAT activity in etiolated seedlings of Catharanthus roseus is induced by exposure of seedlings to light and that enzyme activity is restricted principally to the cotyledons. Evidence is now presented that phytochrome is involved in the light-mediated induction of DAT activity in Catharanthus cotyledons.

¹ This work was supported by a fellowship to R.J.A. from the Netherlands Organization for Scientific Research, and by grants to V.D.L. from the National and Engineering Research Council of Canada and from Les Fonds pour la Formation de Chercheurs et l'Aide à la Recherche de Québec.

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