Cytokinin Utilization by Adenine-Requiring Mutants of the Yeast Saccharomyces cerevisiae.
By monitoring the growth of several adenine auxotrophs of the yeast Saccharomyces cerevisiae on cytokinin-supplemented media, we have demonstrated that this organism can utilize some of these derivatives as a source of adenine. Growth of a mutant lacking adenylosuccinate synthetase suggests that the conversion of cytokinins to adenine does not involve a hypoxanthine intermediate and may be catalyzed by an enzyme analogous to cytokinin oxidase.
Van Kast
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Department of Biology, Loyola University of Chicago, 6525 N. Sheridan Road, Chicago, Illinois 60626.
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