Thirty strains from the 11 species of the genus were studied by multilocus enzyme electrophoresis at 12 enzyme loci, all of which were polymorphic. The mean number of alleles per locus was 6.5. Twenty-five electrophoretic types were distinguished. Grouping of the strains by cluster analysis was in general agreement with species delineation as determined by DNA-DNA hybridization, except for the strains of , which were scattered throughout the genus, reflecting previously recognized taxonomic uncertainties. Analysis of the clonality within that this population was relatively heterogeneous and a lack of gene linkage disequilibrium could not be excluded. There was a genetic discrimination between the pathogenic species and the saprophytic ones. The phenotypically intermediate species () were also genetically separated and were probably closer to the saprophytes than to the pathogens.


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