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Breakup of Linkage Blocks in Cotton, Gossypium hirsutum L.¹

We conducted this study to determine if the negative genetic associations frequently observed between yield and fiber strength in cotton (Gossypium hirsutum L.) could be reduced by random intermating. We selected for comparison two populations derived from a cross of ‘Stoneville 7A’ x ‘Pee Dee 165’. The "original" population consisted of 96 families, each produced from a random F₂ plant. Ninety-six families comprised the "intermated" population. This intermated population was produced from two generations of random intermating after reaching F₃.

Mean comparisons between the two populations showed small but significant differences for some traits, indicating that selection in the intermated population may have taken place or that linked epistasis was involved. Genotypic variances were approximately the same for both populations. The negative genetic correlation between lint yield and fiber strength was decreased by intermating. Genetic correlations between other traits were generally reduced by intermating. These results imply that some modifications of the conventional method of cotton breeding are necessary to improve yield and fiber strength. Modifications discussed are the use of random intermating, diallel selective mating, use of selection indexes, backcrossing, and bulk breeding.

Key Words: Genetic correlation • Genetic variance • Breeding methods

² Research Geneticist, Plant Science Research Division, ARS, USDA, and Plant Breeder, Delta Branch of the Mississippi Agricultural and Forestry Experiment Station, respectively. Stoneville, Miss. 38776.

Received for publication March 5, 1971.

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