Genetic studies of thebincompatability locus ofUstilago maydis

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Abstract
SUMMARY: Theblocus ofUstilago maydisis both an incompatibility locus and a pathogenicity locus. There are several differentbfactors, and they are randomly distributed and equally frequent in the natural population. A sample of 62 lines contained 18bgroups and permitted an estimate of no more than 25bgroups in the natural population. All lines within the samebgroup are indistinguishable in their mating behaviour. No linkage was detected betweenband any of the four biochemical markers tested. No intrafactor recombinants atbwere found among more than 6700 progeny. Differences in degree of pathogenicity between solopathogenic diploids and comparable haploid by haploid crosses were detected.
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