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Diallel Analyses of Quantitatively Inherited Characters in Gossypium hirsutum L.

Diallel analyses were made on a 5-parent complete diallel cross for 6 characters: yield, lint percent, boll size, seed index, lint index, and earliness. The objectives were: (1) To study epistasis for these characters, and (2) to evaluate further the fit of these parents to the assumptions necessary for the diallel analysis. Yield and boll size were the only characters for which dominance was significant. These same characters had shown dominance in an earlier experiment. Over-all epistasis was barely significant for boll size and seed index, but no individual epistatic deviations were significant. Yield, seed index, and lint index apparently met all requirements for the diallel analysis. Multiple allelism appeared to be present in lint percent, boll size, and earliness.

Received for publication December 20, 1965.