The Population Structure of Phytophthora infestans from the Toluca Valley of Central Mexico Suggests Genetic Differentiation Between Populations from Cultivated Potato and Wild Solanum spp
| Autor: | William E. Fry, Anne Sturbaum, W.G. Flier, Niklaus J. Grünwald, Trudy B. M. van den Bosch, Edith Garay-Serrano, Héctor Lozoya-Saldaña, Lod J. Turkensteen, Laurens P. N. M. Kroon |
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| Rok vydání: | 2008 |
| Předmět: |
Population
Population genetics Plant Science sympatric speciation diversity resistance mont debary pcr amplification oospores Botany western slopes p-infestans education nevado-de-toluca Genetic diversity education.field_of_study Biointeracties and Plant Health biology fungi food and beverages biology.organism_classification Solanum tuberosum flow Phytophthora infestans PRI Biointeractions en Plantgezondheid Amplified fragment length polymorphism Solanum Agronomy and Crop Science Genetic isolate |
| Zdroj: | Phytopathology, 93(4), 382-390 Scopus-Elsevier Phytopathology 93 (2003) 4 |
| ISSN: | 0031-949X |
| Popis: | Flier, W. G., Grunwald, N. J., Kroon, L. P. N. M., Sturbaum, A. K., van den Bosch, T. B. M., Garay-Serrano, E., Lozoya-Saldana, H., Fry, W. E., and Turkensteen, L. J. 2003. The population structure of Phytophthora infestans from the Toluca Valley of central Mexico suggests genetic differentiation between populations from cultivated potato and wild Solanum spp. Phytopathology 93:382-390. The population structure of Phytophthora infestans in the Toluca Valley of central Mexico was assessed using 170 isolates collected from cultivated potatoes and the native wild Solanum spp., S. demissum and S. ×edinense. All isolates were analyzed for mitochondrial DNA (mtDNA) haplotype and amplified fragment length polymorphism (AFLP) multilocus fingerprint genotype. Isolate samples were monomorphic for mtDNA haplotype because all isolates tested were of the Ia haplotype. A total of 158 multilocus AFLP genotypes were identified among the 170 P. infestans isolates included in this study. P. infestans populations sampled in the Toluca Valley in 1997 were highly variable and almost every single isolate represented a unique genotype based on the analysis of 165 AFLP marker loci. Populations of P. infestans collected from the commercial potato-growing region in the valley, the subsistence potato production area along the slopes of the Nevado de Toluca, and the native Solanum spp. on the forested slopes of the volcano showed a high degree of genetic diversity. The number of polymorphic loci varied from 20.0 to 62.4% for isolates collected from the field station and wild Solanum spp. On average, 81.8% (135) of the AFLP loci were polymorphic. Heterozygosity varied between 7.7 and 19.4%. Significant differentiation was found at the population level between strains originating from cultivated potatoes and wild Solanum spp. (P = 0.001 to 0.022). Private alleles were observed in individual isolates collected from all three populations, with numbers of unique dominant alleles varying from 9 to 16 for isolates collected from commercial potato crops and native Solanum spp., respectively. Four AFLP markers were exclusively found present in isolates collected from S. demissum. Indirect estimation of gene flow between populations indicated restricted gene flow between both P. infestans populations from cultivated potatoes and wild Solanum hosts. There was no evidence found for the presence of substructuring at the subpopulation (field) level. We hypothesize that population differentiation and genetic isolation of P. infestans in the Toluca Valley is driven by host-specific factors (i.e., R-genes) widely distributed in wild Solanum spp. and random genetic drift. |
| Databáze: | OpenAIRE |
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