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Articles

Glucosyl Zeatin and Glucosyl Ribosylzeatin from Vinca rosea L. Crown Gall Tumor Tissue ¹

^a Department of Plant Sciences, Indiana University, Bloomington, Indiana 47401

Recently detected but unidentified cytokinin activity in crown gall tumor tissue from Vinca rosea L. grown on media containing sources of reduced nitrogen has now been attributed to two adenine-type cytokinins. These compounds are glucopyranosyl derivatives of zeatin and ribosylzeatin. The substitution in each case is on the isopentenyl chain of the parent compound. Neither of these compounds had activity in the soybean callus bioassay at concentrations lower than 1 nM whereas zeatin had activity at 0.1 nM.

³ To whom reprint requests should be sent.

¹ This study was supported by Grants GB35232X and BMS 75-17654 from the National Science Foundation and represents part of a thesis presented by J. B Peterson to the Graduate School of Indiana University in partial fulfillment of the requirements for the Ph.D. degree.