A worldwide collection of 111 isolates of Fusarium oxysporum f. sp. lyropersici from tomato was examined for isozyme polymorphisms. Of 15 enzymes assayed, eight and seven revealed single and multiple bands, respectively, for a total of 30 putative loci. Twenty-two of the 30 loci exhibited complete homogeneity among all isolates surveyed. Eight loci were variable and revealed two to five putative alleles per locus. Thirty-four electrophoretic phenotypes (EPs) were identified. EPs 1 and 2, with 49 and 13 members, respectively, included 53% of all the isolates []
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Karol S. Elias (1992) studied this question.