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The Occurrence of Dual Compatibility in Cochliobolus spicifer

R. R. Nelson, R. K. Webster and D. R. MacKenzie
Mycologia
Vol. 69, No. 1 (Jan. - Feb., 1977), pp. 173-178
DOI: 10.2307/3758628
Stable URL: http://www.jstor.org/stable/3758628
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Occurrence of Dual Compatibility in Cochliobolus spicifer
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Abstract

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.

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