Population Structure of Phytophthora Infestans in the Toluca Valley Region of Central Mexico
Ecology and Population Biology Population Structure of Phytophthora infestans in the Toluca Valley Region of Central Mexico Niklaus J. Grünwald, Wilbert G. Flier, Anne K. Sturbaum, Edith Garay-Serrano, Trudy B. M. van den Bosch, Christine D. Smart, John M. Matuszak, H. Lozoya-Saldaña, Lod J. Turkensteen, and William E. Fry First, sixth, seventh, and tenth authors: Department of Plant Pathology, Cornell University, Ithaca, NY 14853; first, third, fourth, and eighth authors: CEEM/PICTIPAPA Potato Late Blight Project, Apartado postal 3-2, Izcalli Cuauhtemoc V, Metepec, Edo. de México 52176, Mexico; second, fifth, and ninth authors: Plant Research International, P.O. Box 16, 6700 AA Wageningen, the Netherlands; and eighth author: Departamento de Fitotecnia, Universidad Autónoma Chapingo, 56230, Chapingo, Edo. de México, Mexico. Current address of N. J. Grünwald: USDA-ARS, 24106 N. Bunn Rd., Prosser, WA 99350. Accepted for publication 21 May 2001. ABSTRACT Grünwald, N. J., Flier, W. G., Sturbaum, A. K., Garay-Serrano, E., van phosphate isomerase and Peptidase allozymes, the subpopulations from den Bosch, T. B. M., Smart, C. D., Matuszak, J. M., Lozoya-Saldaña, H., the three habitats were significantly differentiated in both sampling periods. Turkensteen, L. J., and Fry, W. E. 2001. Population structure of In contrast to allozyme data for 1997-98, no differences were found Phytophthora infestans in the Toluca valley region of central Mexico. among the three subpopulations for sensitivity to metalaxyl. Two groups Phytopathology 91:882-890. of isolates identical for allozyme and mating type were further investi- gated by restriction fragment length polymorphism fingerprinting; 65% We tested the hypothesis that the population of Phytophthora infestans of one group and 85% of another group were demonstrated to be unique.
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