The genetics of Cochliobolus spiciferus. I. Genetic inhibition of perithecial and ascus formation

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Abstract
The present investigation showed that certain conidial isolates of C. spiciferus exhibit complete mating inhibition, although the matings consisted of pairings between opposite compatibility types. Other isolates of opposite compatibility produced only sterile perithecia when mated under favorable cultural conditions. It was determined through a genetic analysis that perithecial inhibition in C. spiciferus is conditioned by the presence of the recessive allelic forms, in the homozygous condition in the fusion nucleus at either of two loci designated as I1 and I2. The formation of asci in matings between strains of opposite compatibility was found to be inhibited when both isolates of the mating contain the recessive form of a third gene designated as S.The results are discussed in connection with their significance in assessing the biological relationship of C. spiciferus to other members of the genus Cochliobolus and to members of the genus Curvularia.
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