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General vs. Specific Combining Ability in Alfalfa for Seedling Vigor and Fall Growth Habit in the Year of Establishment¹

Synopsis: Seedling vigor and fall growth habit of the 91 diallel crosses among 14 alfalfa clones were scored in 3 and 4 states, respectively. Estimated, variance components for general (by far the largest component) and specific combining ability and the interaction of these with locations were all highly significant for both characters. Clones differed in their contributions to both additive and nonadditive genetic variances. The two characters were highly correlated (range +0.82 to 0.93), and interlocation correlations for each character were likewise high.

² Research Agronomist and Geneticist, respectively, Crops Research Division, ARS, USDA, University Park, Pa.

³ Agricultural Administrator, Crops Research Division, ARS, USDA, Beltsville, Md.

⁴ Research Agronomists, Crops Research Division, ARS, USDA, Nebraska Agr. Exp. Sta., Lincoln, Nebr., and Beltsville, Md., respectively.

⁵ Professor of Agronomy, Purdue Agr, Exp. Sta., Lafayette, Ind.

⁶ Associate Professor of Agronomy and Plant Genetics, Minnesota Agr. Exp. Sta., St. Paul, Minn.