Abstract
Verticillium longisporum is an allodiploid hybrid fungus that consists of at least three groups, A1/D1, A1/D2, and A1/D3. PCR-based analysis of 18S rDNA, 5.8S rDNA-ITS region, mtSSU-rDNA, cytochrome b gene, and mating type gene, as well as RAPD analysis, revealed that Verticillium wilt of cabbage in Gunma Prefecture in Japan is caused by two groups of V. longisporum—A1/D1 and A1/D3—and by V. dahliae. A1/D1 and A1/D3 lineage strains were equally distributed in cabbage fields, whereas V. dahliae strains were most frequently isolated. The proportion of the three types of Verticillium had not changed in 1998 and 2008. Although both V. longisporum strains produced longer conidia than the V. dahliae strains, the A1/D3-type strains produced larger conidia than A1/D1-type strains. In addition, the A1/D3-type strains formed microsclerotia that were distinguishable from those of A1/D1-type of V. longisporum and V. dahliae. The pathogenicity of the A1/D3-type strains on cabbage was similar to that of the A1/D1-type strains. These results will contribute to understanding of genotypic diversity, distribution, and pathogenicity of Verticillium species pathogenic on cabbage.
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