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CROP BREEDING & GENETICS

Genetic Effects of Thirteen Gossypium barbadense L. Chromosome Substitution Lines in Topcrosses with Upland Cotton Cultivars: II. Fiber Quality Traits

^a USDA-ARS Crop Science Research Lab., Mississippi State, MS 39762
^b Dep. of Plant and Soil Sciences, Mississippi State Univ., Mississippi State, MS 39762
^c Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843-2474. Mention of trade names or commercial products in this manuscript does not imply recommendation or endorsement by the USDA. Joint contribution of USDA-ARS and Mississippi State University. Journal paper No. J 10974 of Mississippi Agricultural and Forestry Experiment Station

^* Corresponding author (jnjenkins{at}ars.usda.gov).

Thirteen chromosome substitution lines (CS-B) lines with individual 3-79 Gossypium barbadense L. chromosome or arms substituted into TM-1, G. hirsutum L., were crossed with five Upland cultivars and additive and dominance effects for fiber micronaire, elongation, length, and strength were measured over four environments. Additive genetic effects were considerably larger than dominance or environmental interaction effects. Fiber strength of 3-79 and FM966 were 282 and 240 kN m kg^–1, respectively. FM966 had greater additive effects for fiber length (1.13 mm) and strength (12.90 kN m kg^–1) than any CS-B line; however, CS-B25 had the greatest additive effects (8.97 kN m kg^–1) for strength among CS-B lines. The greatest negative additive effect for fiber length was –1.29 mm (CS-B22sh). Although several CS-B lines had negative additive effects on strength, none was more negative than TM-1 (–5.31 kN m kg^–1). CS-B02 and CS-B25 had additive effects on strength of 2.36 and 8.97 kN m kg^–1. SG747 had the greatest negative additive effect (–12.13 kN m kg^–1) for strength among cultivars and CS-B lines. CS-B07 and CS-B18 had negative additive effects for fiber strength but had significant and positive dominance effects with FM966. When individual CS-B lines were crossed with elite cultivars beneficial alleles for fiber properties were uncovered on specific chromosomes or chromosome arms that should aid introgression of alleles from 3-79 into Upland.

Abbreviations: CS-B, chromosome substitution line from G. barbadense • GCA, general combining ability • QTL, quantitative trait locus • SCA, specific combining ability.