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

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Abstract
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’ ✕ ‘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.

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