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Diversity in and evidence for selection on the mitochondrial genome of Phytophthora infestans

机译：疫病疫霉的线粒体基因组多样性及选择证据

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Two extant nomenclature systems were reconciled to relate six mitochondrial DNA (mtDNA) haplotypes of Phytophthora infestans, the oomycete pathogen causing late blight disease on potato and tomato. Carter's haplotypes I-a and I-b were included in Goodwin's haplotype A, while Carter's haplotypes II-a and II-b were included in Goodwin's haplotype B. In addition, haplotypes E and F were included in Carter's haplotype I-b. The mutational differences separating the various haplotypes were determined, and we propose that either haplotype I-b(A) or haplotype I-a(A) is the putative ancestral mtDNA of R infestans, because either can center all the other haplotypes in a logical stepwise network of mutational changes. The occurrence of the six haplotypes in 548 isolates worldwide was determined. Haplotypes I-a and II-a were associated with diverse genotypes worldwide. As previously suggested, haplotype I-b was found only in the US-1 clonal lineage and its variants (n = 99 isolates from 16 countries on 5 continents), and haplotype II-b was limited to the US-6 clonal lineage and its derivatives (n = 36). In a confirmation of a previous suggestion, the randomly mating population in the Toluca Valley of central Mexico (n = 78) was monomorphic for mtDNA haplotype I-a(A). We hypothesize that selection there may be driving the dominance of that single mtDNA haplotype. [References: 37]
机译：协调了两个现存的命名系统，以关联致病疫霉的六种线粒体DNA（mtDNA）单倍型，致病菌是引起马铃薯和番茄晚疫病的卵菌病原体。 Goodwin的单倍型A包括Carter的单倍型I-a和I-b，Goodwin的单倍型B包括Carter的单倍型II-a和II-b。此外，Carter的单倍型I-b包括单倍型E和F。确定了分离不同单倍型的突变差异，并且我们建议单倍型Ib（A）或单倍型Ia（A）是R infestans的推定祖先mtDNA，因为它们都可以将所有其他单倍型集中在突变的逻辑逐步网络中变化。确定了全世界548个分离株中6个单倍型的发生。单倍型I-a和II-a与全世界不同的基因型相关。如前所述，单倍型Ib仅在US-1克隆谱系及其变体中发现（n =来自五大洲16个国家的99个分离株），而单倍型II-b仅限于US-6克隆谱系及其衍生物（ n = 36）。为了证实先前的建议，墨西哥中部托卢卡山谷（n = 78）的随机交配种群对于mtDNA单倍型I-a（A）是单态的。我们假设选择可能会驱动单个mtDNA单倍型的优势。 [参考：37]

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