The correlation of yield and specific gravity in the USDA potato breeding program
Haynes, K.G. | Webb, R.E. | Goth, R.W. | Wilson, D.R.
Every year potato (Solanum 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 [USA]. 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 analysis of marketable yield on specific gravity showed a greater 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.
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