Color mutants in Cochliobolus carbonum

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Abstract
One spontaneous and 31 ultraviolet-induced albino mutants of apparently independent origin of Cochliobolus carbonum Nelson were shown to be alleles or, at least, very closely linked. One spontaneous and one ultraviolet-induced mutant at a second locus conditioned the production of brown rather than black conidia. A third type of mutant induced by ultraviolet (uv.) irradiation produced visible quantities of a diffusible, lavender pigment. The lavender locus appeared to be loosely linked to the albino (40 crossover units) and the brown conidia (38 crossover units) loci. The mating type alleles segregated independently of the three loci affecting color.Albino mutants produced fewer and less well-developed perithecia in matings than did the wild-type isolates from which they were derived. Perithecia of the brown conidia mutants could not be distinguished from wild-type perithecia.

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