Abstract
Every year potato (Solarium tuberosum L.) clones which remain in the USDA potato breeding program after six or more years of selection are entered into yield trials in Maine. Specific gravity and yield data were analyzed for six years (1972, 1975, 1978, 1981, 1984, and 1987) to determine the relationship between specific gravity and yield for populations of white and russet potatoes. In these trials, marketable yields of white-skinned potatoes were significantly greater than those of russet potatoes. Average specific gravity was significantly greater in the white than in the russet potatoes in three of the six years. A slight, but usually not significant, negative correlation of marketable yield with specific gravity was found for russet potatoes. A significant negative correlation of marketable yield with specific gravity was found in three of the six years for white potatoes. Regression analyses of marketable yield on specific gravity showed a great dispersion of values. Since only one or two advanced lines are potential variety releases, the present breeding approach is sufficient to continue to release potato varieties of acceptable yield and specific gravity.
Compendio
Cada año, los clones de papa (Solarium tuberosum L.) que permanecen en el programa de mejoramiento de papa después de seis o más años de selectión son incorporados en ensayos de rendimiento en Maine. Los datos sobre la gravedad específica y rendimiento fueron analizados por seis años (1972, 1975, 1978, 1981, 1984 y 1987) para determinar la relatión existente entre la gravedad específica y el rendimiento para poblaciones de papa de piel blanca y piel roja. En estos ensayos, los rendimientos comerciables de la papa de piel blanca fueron significativamente mayores que aquellos de la papa roja. En tres de los seis afios la gravedad específica promedio fue significativamente mayor en la papa blanca que en la papa roja. Una pequefñia, pero generalmente no significativa correlatión negativa de rendimiento comerciable con la gravedad específica fue encontrada para la papa roja. En tres de los seis años se encontró una correlation negativa significativa del rendimiento comerciable con la gravedad específica para la papa blanca. El análisis de regresión del rendimiento comerciable sobre la gravedad específica mostró una gran dispersión de valores. Desde que solo una o dos líneas avanzadas son variedades potenciales a liberarse, el presente enfoque de mejoramiento es suficiente para continuar liberando variedades de papa de rendimiento y gravedad específica aceptables.
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Haynes, K.G., Webb, R.E., Goth, R.W. et al. The correlation of yield and specific gravity in the USDA potato breeding program. American Potato Journal 66, 587–592 (1989). https://doi.org/10.1007/BF02852123
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DOI: https://doi.org/10.1007/BF02852123