Abstract
A series of clonal variants of common potato varieties which had been selected for different maturities were screened in the field for their resistance to early blight caused by the fungusAlternaría solani. Maturity of these cultivars was also rated in the field. A strong correlation was found between cultivar maturity and resistance to early blight. Earlier-maturing cultivars were more susceptible, and later-maturing cultivars were more resistant. Starch gel electrophoresis of the tuber enzymes of these cultivars indicated that the maturity variants did not differ with respect to the isozymes tested. This is consistent with the hypothesis that variants of the same cultivar, differing only in maturity, had been selected. These results therefore suggest that it may be difficult to select cultivars which are both early-maturing, and resistant to early blight.
Compendio
Una serie de variantes clonales de variedades comunes de papa que habían sido seleccionadas para diferentes grados de madurez, fueron evaluadas en el campo para resistencia al tizón temprano causado por el hongoAlternaria solani. Se calificó también la madurez de estos cultivares en el campo. Se encontró una correlación muy grande entre la madurez del cultivar y la resistencia al tizón temprano. Los cultivares que maduraron más temprano fueron más susceptibles y aquellos más tardÍos fueron más resistentes. La electroforesis de las enzimas de los tubérculos de estos cultivares en geles de almidón indicó que en cuanto a madurez las variantes no diferÍan con respecto a las isozimas probadas. Esto es consistente con la hipótesis que las variantes del mismo cultivar que habÍan sido seleccionadas diferÍan sólamente en madurez. Estos resultados por lo tanto sugieren que puede ser muy difÍcil seleccionar cultivares que sean tanto precoces como resistentes al tizón temprano.
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Johanson, A., Thurston, H.D. The effect of cultivar maturity on the resistance of potatoes to early blight caused byAlternaria solani . Am. J. Pot Res 67, 615–623 (1990). https://doi.org/10.1007/BF03043447
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DOI: https://doi.org/10.1007/BF03043447