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The Occurrence of Dual Compatibility in Cochliobolus spicifer
R. R. Nelson, R. K. Webster and D. R. MacKenzie
Vol. 69, No. 1 (Jan. - Feb., 1977), pp. 173-178
Published by: Mycological Society of America
Stable URL: http://www.jstor.org/stable/3758628
Page Count: 6
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Two ascospore progenies from a cross between two obligately heterothallic isolates of Cochliobolus spicifer were found to be sexually compatible with both mating types although self-sterile, and were termed "dual compatible." All matings between dual compatible isolates were fertile and all ascospore progeny derived from crosses of dual compatible isolates and heterothallic isolates were fertile with the dual compatible parent. Genetic analyses of first and second generation dual compatible isolates gave dissimilar segregation patterns. Segregation patterns for one ascospore isolate followed a 1: 1: 1 ratio for mating types of A: a: dual, respectively. The second ascospore isolate followed a 1: 2: 1 segregation ratio for two generations for mating types of nonparental: parental: dual, respectively. The dual mating capacity does not appear to conform to any previously described sexual mechanism in the fungi.
Mycologia © 1977 Mycological Society of America