Nutrilite Requirements of Osmophilic Yeasts

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Abstract
23 Strains of osmophilic yeasts of the genus Zygosaccharomyces, representing 18 spp., were studied with respect to their requirements of inositol, biotin, pantothenic acid, thiamin and pyridoxin, added to a basal solution of inorganic salts and 40 per cent glucose. Biotin was essential to the growth of all strains. On the basis of their need for pantothenic acid, the yeasts could be divided into 3 groups according to whether this nutrilite was essential, stimulating or relatively unimportant. B-alanine was able to replace pantothenic acid in providing the combined growth-factor effect. In the case of 3 spp. inositol was found necessary for optimum growth, this nutrilite being specially important for Z. nectarophilus, though effective only in the presence of biotin and pantothenic acid. With yeasts not requiring inositol the combined growth factor effect could be obtained with biotin and pantothenic acid. In some cases thiamin exerted slightly stimulating or depressing effects, being more significant in promoting maximum growth in the case of Z. nussbaumeri, Z. richteri and one strain of Z. nectarophilus. Pyridoxin was still less important as a nutrilite. Strains previously considered specifically identical on the basis of morphology and fermentative capacity showed good agreement in nutrilite requirements, suggesting the value of the latter detn. as an aid in classification.

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