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Genetic Studies and Breeding for Stable Late Blight Resistanceof Potato in the United States and Mexico
Héctor Lozoya Saldaña, Alejandro Hernández Vilchis, Edith Garay Serrano, Charles R. Brown, Niklaus Grünwald, John P. Helgeson;
Revista Mexicana de Fitopatología 2001 19(2)
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Inglés Español
Lozoya-Saldaña, H., Hernández-Vilchis, A. Garay-Serrano, E.,Brown, C.R., Grünwald, N. and Helgeson, J.P. 2001. Genetic studies and breeding for stable late blight resistance of potatoin the United States and Mexico. Revista Mexicana de Fitopatología 19:253-259.New forms of the potato late blight pathogen (Phytophthorainfestans) have recently migrated from Mexico to the rest ofthe world. The best long term solution has been to breed new varieties with durable genetic resistance to the disease. Since1995, the Agricultural Research Service of the Department ofAgriculture of the United States keeps sending selected potato progenies for testing in the Toluca Valley of Mexico,under a rainfed, natural infection growing cycle. Six out of187 families from Aberdeen, Idaho, were rated as highlyresistant, with a mean family foliar infection of < 20% andwith > 50% resistant progenies. Also, 828 clones from fertile somatic hybrids from Solanum bulbocastanum-derivedgenotypes from Madison, Wisconsin, have been evaluated.Selected clones from this program are progenies from the J-line and 95LB1 and 95LB2 families. Lines with back ground resistance from S. bulbocastanum, S. hougassii, and multiplewild and primitive Polish cultivars, from Prosser, Washington,have also been tested. About one third of these clones showacceptable foliage resistance to Late Blight, although withlow tuber yield. The USDA National Potato Genebank at Sturgeon Bay, Wisconsin, has been another source of germplasm for testing in Toluca, including families from wild species such as S. okadae, S. microdontum, S. papita, S.berthaultii, and S. iopetalum. Although a wide range ofsegregation has been observed, some resistant accessionshave been identified. A limited number of out standing clonesfrom all sources are transferred every year to the MexicanFederal and State Agricultural Research Institutions (INIFAPand ICAMEX, respectively) for further evaluations

Palabras clave: Phytophthora infestans, Solanum spp.
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Universidad Autónoma del Estado de México
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