Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: March 24, 2006
Publication Date: June 1, 2006
Citation: Grunwald, N.J. 2006. Evolution and structure of populations of Phytophthora infestans and relatives at their center of origin. Phytopathology. 96:S147. Technical Abstract: 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 Solanum spp. Recent work conducted in Mexico sheds new light on the biology and evolution of Phytophthora infestans and other related Phytophthora pathogens. It now appears that Mexican Solanum species, which coevolved with P. infestans and were previously known for providing a source of R-genes, also provide a source of quantitative, rate-reducing resistance that is high, stable and durable. It is now apparent that Mexico is not only the center of origin of the potato late blight pathogen P. infestans, but also of several related Phytophthora species including P. mirabilis, P. ipomoeae and possibly P. phaseoli. Our current hypothesis is that these Phytophthora species evolved sympatrically from one ancestral host through adaptive radiation onto their respective four host families.