Genetics of Ustilago violacea. II. Polymorphism of Color and Nutritional Requirements of Sporidia from Natural Populations

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Abstract
Teliospores of U. violacea were collected in the field or from herbarium specimens of caryophyllaceous species to detect polymorphism for sporidial colony color and sporidial nutritional requirement. Thirty-two collections were obtained. The germinating spores from each collection produced either uniformly white, pink, yellow, or pumpkin colonies or bisectored colonies with one of the 6 combinations of these colors. Both mating types from each collection were either prototrophic, thiamine requiring, or casamino acids dependent; or the mating types differed in their nutritional requirements. Nutritional polymorphism does not appear to account for polymorphism of pathogenicity (physiological races) in this species.

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