The central highlands of Mexico are considered to be a center of genetic diversity for both the potato late blight pathogen and for tuber-bearing spp. Recent work conducted in Mexico and South America sheds new light on the biology and evolution of and other related pathogens. It now appears that Mexican species, which coevolved with and were previously known for providing a source of R-genes, also provide a source of quantitative, rate-reducing resistance that is highly effective, stable, and durable. It is now apparent that Mexico is the center of origin not only of the potato late blight pathogen , but also of several related species including , , and possibly We close with the hypothesis that these species evolved sympatrically from one ancestral host through adaptive radiation onto their respective four host families.


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  • Article Type: Review Article
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