Genetics of Cochliobolus Heterostrophus. III. Genetic Factors Inhibiting Ascus Formation

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Abstract
Studies on the genetic complexity of sexual reproduction in Cochliobolus heterostrophus, a heterothallic Ascomycete, have demonstrated the presence of a gene block prior to plasmogamy. Although no fertile crosses of the "sterile-perithecial" strain and wild-type isolates have been obtained, the production of greater numbers of normal-appearing perithecia when the "sterile" isolate is paired with either mating type suggests its capacity to function as either compatibility type. The ability of the "sterile" strains to produce normal-appearing perithecia when selfed possibly represents a basic step in a transition from heterothallism to homothallism.

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