Dissecting Genotype × Environment Interactions and Trait Correlations Present in the Pee Dee Cotton Germplasm Collection following Seventy Years of Plant Breeding

Genotype × environment (G × E) interactions and trait correlations signifi cantly impact efforts to develop high-yield, high-quality, and environmentally stable Upland cotton (Gossypium hirsutum L.) cultivars. Knowledge of both can and should be used to design optimal breeding programs and effective selection criteria. In this study, we examined the G × E interactions and trait correlations present in the 70-yr Pee Dee cotton germplasm enhancement program. Since beginning in 1935, the Pee Dee program has employed a variety of unique germplasm and breeding methods to release >80 improved germplasm lines and cultivars. Results suggest that signifi cant G × E interactions exist for several agronomic and fi ber quality performance traits that are mostly due to changes in magnitude. Negative genotypic correlations still persist between lint percent/lint yield and fi ber length/fi ber strength. However, apparently the breeding methods and selection criteria used over 70 yr have lessened the negative relationship between agronomic performance and fi ber quality over time to some degree. The results provide cotton breeders a resource to select specifi c Pee Dee germplasm lines for increased environmental stability. Cotton breeders can also use the information herein to select speci fi c Pee Dee germplasm lines that represent rare recombination events that combine high yield and fi ber quality potential.

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