Genetics of Cochliobolus heterostrophus. II. Genetic Factors Inhibiting Ascospore Formation

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Abstract
From a study of ascospore progenies from crosses of isolates exhibiting marked differences in degree of compatibility, 2 monoascosporic isolates were obtained that produced perithecia with sterile asci when selfed. Subsequent research indicated that the isolates comprised a mixture of 2 kinds of homocaryotic hyphae, one component contributing the A gene for combatibility and the other a. Genetic crosses of the 2 components always produced perithecia with sterile asci. Crosses of either component with normal heterothallic isolates produced perithecia containing sterile asci and fertile asci in varying ratios. The results demonstrate that ascospore formation is controlled by 2 or more genes and further illustrates the complexity of sexual reproduction in the species.