Genetics of Cochliobolus heterostrophus. I. Variability in Degree of Compatibility

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Abstract
Cochliobolus heterostrophus Drechsl. (Helminthosporium maydis Nisik. and Miyake) is heterothallic, and monoconidial and monoascosporic isolates comprise 2 distinct compatibility groups, designated as A and a. Although repeated matings demonstrated that all isolates are completely intergroup fertile, the relative frequency of fertile crosses with known compatible isolates indicates that isolates within a compatibility group differ in degree of compatibility. Within group A, the frequency of fertile intergroup crosses ranged from 58 to 96% and within group a the range was from 62 to 98%. Isolates were designated as "Strong", "Intermediate", or "Weak" based on % of intergroup = fertile crosses. Studies of ascospore progenies indicate that differences in degree of compatibility are gene controlled. The data suggest that such genes directly influence the major gene locus for compatibility.

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