Summary
To assess evolutionary relationships among the oomycetous fungi we have constructed a physical and genic map of the mtDNA of a broad host range strain (695T) of Phytophthora megasperma. While, like other Phytophthora species, this 43.5 kb circular genome lacks the typical oomycete large inverted repeat, a short 0.5–0.9 kb inverted repeat has been identified. Comparison of the relative order of seven genic regions with host-specific Phytophthora strains reveals both a clustering of these loci within one-third of the host-specific genomes, and two genic inversion relative to the broad host range genome. The location of the short inverted repeat suggests that at least one of the inversions is a consequence of intramolecular recombination between repeat elements.
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Abbreviations
- atp6, atp9 :
-
genes for ATP synthase subunits 6 and 9
- cox1. cox2. cox3 :
-
genes for cytochrome c oxidase subunits I, II, and III
- cob :
-
gene for apocytochrome b
- rns, rnl :
-
genes for small and large mitochondrial rRNAs
- mtDNA:
-
mitochondrial DNA
- kb:
-
kilobase pairs
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Shumard-Hudspeth, D.S., Hudspeth, M.E.S. Genic rearrangements in Phytophthora mitochondrial DNA. Curr Genet 17, 413–415 (1990). https://doi.org/10.1007/BF00334520
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DOI: https://doi.org/10.1007/BF00334520