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Double-stranded, 1.9-kilobase-pair (kbp) DNA molecules were found in 18 strains representing three pathogenic races of Fusarium oxysporum f. sp. conglutinans. The DNA element (pFOXC1) from a race 1 strain and the DNA element (pFOXC2) from a race 2 strain were shown by restriction endonuclease mapping to be linear. pFOXC2 was found in mitochondrial preparations and appears to have blocked 5' termini, as it was sensitive to 3'----5' exonuclease III but insensitive to 5'----3' lambda exonuclease. The major 1.8-kbp BglII restriction endonuclease fragment of pFOXC2 was cloned in plasmid pUC12. The recombinant plasmid (pCK1) was not homologous to the mitochondrial or nuclear genomes from F. oxysporum f. sp. conglutinans. This suggests that pFOXC2 is self-replicating. pCK1 was homologous to all 1.9-kbp DNA elements of race 2 but was not homologous to those of race 1 or race 5. All race 1 and 5 elements were also shown to share common DNA sequences.

Linear plasmidlike DNA in the plant pathogenic fungus Fusarium oxysporum f. sp. conglutinans