棉 花 学 报 Cotton Science 2005，17(1)：47-55
Evaluating American and China Cotton Cultivars and Their Crosses for Improvement Abstract: The use of diverse elite cotton cultivars, Gossypium hirsutum L, in cotton breeding may lead to improvements of important traits. In this study, three American cultivars were used as female parents and crossed with two China cultivars. The five parents and six F2and F3 hybrids were evaluated at Mississippi State University for three years. The additive, dominance, and additive × additive (ADAA) genetic models were used for data analysis. Variance components, genetic effects, and genotypic values were calculated. The results showed additive × additive epistatic effects were significant for most agronomic and fiber traits. China cultivars CR110 and 86-1 can be used as parents to improve fiber micronaire. CR110 and Deltapine 90 (DP90) were good combiners for fiber length and fiber strength. Genetic predictions showed that: 1) crosses with DP90 would improve lint yield in later generations, 2) the cross between CR110 and Stoneville 474 (ST474) can be used to increase lint yield at early generations but may not be good for selection at later generations, 3) all crosses except ST474×CR110 provided the potential for yield improvement at later generations, 4) the cross between 86-1 and Sure-Grow 747 (SG747) had higher fiber strength than the other crosses at both early and late generations, 5) considering genotypic values for lint yield and fiber traits, the cross SG747×86-1 can be used for yield improvement at early and late generations while fiber quality should remain acceptable. This study provides useful data on how diverse cultivars can be used to improve cotton yield and quality.
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