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Partitioned Genetic Variances for Several Characteristics in a Cotton Population of Interspecific Origin¹

Estimates of additive and dominance gentic variances were obtained for 11 agronomic and fiber traits in a cotton population of interspecific origin (Gossypium thurberi Tod., Gossypium arboreum L., Gossypium hirsutum L.). Substantial amounts of additive genetic variation were found for the traits lint percentage, lint index, seed index, weight per boll, fiber length (U.H.M.), fiber strength (T₁), fiber elongation (E_l), fiber fineness (A), and fiber shape (D). Additive genetic variations were also found for seed cotton yield and lint yield but were small in magnitude. Positive estimates of dominance genetic variance were obtained for seven of the traits. Magnitudes of these estimates were generally small and only three (those for lint percentage, weight per boll, and fiber length) exceeded their standard errors. Negative estimates of dominance genetic variance were obtained for seed cotton yield, lint yield, seed index, and fiber shape. Estimates of average degree of dominance, where obtained, were less than unity indicating only partial dominance for genes controlling these traits.

² Formerly graduate assistant (now Geneticist, National Cotton Council of America, Memphis, Tenn.) and Professor of Crop Science.

Received for publication September 17, 1965.