Abstract
The interactions of four potato cultivars, with three isolates ofPhytophthora infestans were assessed in different environments and in different years. Preliminary tests with these cultivars and isolates were conducted in Toluca, Mexico, and Freeville, New York, U.S.A. in 1986 and 1987. Although data were available from only one year for cultivar Alpha, this cultivar had a dramatically different resistance ranking in Toluca, than that in Freeville — a result consistent with previous observations. The difference in resistance between two other cultivars also changed with site, but less dramatically and did not cause a change in resistance ranking. The resistance of the fourth cultivar appeared to be relatively unaffected by change in site. In both sites, all isolates ranked all cultivars in the same order. Although aggressiveness was slightly different in different locations and on different cultivars, variations were small and there were no consistent trends (consistent over all trials) concerning isolate aggressiveness. Thus, changes in location appeared to have different effects on the different cultivars but little or no effect on the isolates used.
Compendio
Las interacciones de cuatro cultivares de papa, con tres aislamientos dePhytophthora infestans, fueron determinadas en diferentes ambientes y años. Pruebas preliminares con estos cultivares y aislamientos se condujeron en Toluca, México y en Freeville, New York, EE.UU, en 1986 y 1987. No obstante que para el cultivar Alpha se contó sólo con información de un año, este cultivar tuvo una resistencia dramáticamente diferente en Toluca, en comparación con la observada en Freeville, un resultado que fue consistente con observaciones anteriores. La diferencia en resistencia entre los otros dos cultivares varió también con el lugar, pero fue menos dramática y no causó cambios en el orden de resistencia por ellos alcanzado. La resistencia del cuarto cultivar aparentemente no varió con el cambio de lugar. En ambos lugares, todos los aislamientos clasificaron a todos los cultivares en el mismo orden. Aunque la agresividad fue ligeramente diferente en los diferentes lugares y cultivares. Las variaciones fueron pequeñas y no existieron tendencias consistentes (consistentes en todos los ensayos) respecto a la agresividad de los aislamientos. Por lo tanto, el cambio de lugar parece tener efectos diferentes sobre los diferentes cultivares, pero poco o ningún efecto sobre los aislamientos utilizados.
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Parker, J.M., Thurston, H.D., Villarreal-Gonzalez, M.J. et al. Stability of disease expression in the potato late blight pathosystem: A preliminary field study. American Potato Journal 69, 635–644 (1992). https://doi.org/10.1007/BF02852676
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DOI: https://doi.org/10.1007/BF02852676