The Utilization of Carbon and Nitrogen Compounds by Ustilago Zeae

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Abstract
SUMMARY This study is concerned with the growth of Ustilago zeae in synthetic media containing various sources of carbon and nitrogen. Four monosporial cultures of U. zeae, all derived from a single promycelium, were studied comparatively. Glucose, levulose, mannose, sucrose, maltose and trehalose were the best of 20 carbon sources tested. D-arabinose, rhamnose, sorbose, melibiose and starch were not utilized. U. zeae is able to utilize nitrate, ammonium, or amino nitrogen. Good growth was obtained in 19 of 23 amino acids tested as sole sources of nitrogen, aspartic acid, asparagine, and serine proving to be superior to other amino acids. Little or no growth was obtained with cystine, cysteine hydrochloride, tyrosine, or hydroxyproline. No qualitative differences in utilization of any of these substances were noted among the four strains of U. zeae studied.

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