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CROP BREEDING & GENETICS

Germplasm Potential for Trait Improvement in Upland Cotton: Diallel Analysis of Within-Boll Seed Yield Components

^a Defense Group Inc., 1140 Connecticut Ave. NW, Ste. 1140, Washington, DC 20036
^b Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843-2474. Research reported herein was conducted by the Texas Agric. Exp. Stn., the Texas A&M Univ. System

^* Corresponding author (paul.ragsdale{at}defensegp.com).

Within-boll seed yield components (seed per boll, motes per boll, ovules per boll, and seed-setting efficiency [SSE]) were evaluated in a diallel analysis of eight upland cotton (Gossypium hirsutum L.) genotypes. Genotypes included four converted race stock (CRS) accessions representing putative extremes for SSE and four commercial types representing Texas, mid-South, and eastern cotton production regions. Parents and their F₁ progeny without reciprocals were evaluated in 2000 and 2001 near College Station, TX. General combining ability (GCA) effects and specific combining ability effects (P = 0.05) were found for each trait, indicating potential for improvement of seed yield components in this population. The CRS accession M-9044-0162 had the best mean performance and GCA effects for each trait, suggesting that it would be a good parent for improving within-boll seed yield components in upland cotton.

Abbreviations: CRS, converted race stock • GCA, general combining ability • M/B, motes per boll • O/B, ovules per boll • S/B, seed per boll • SCA, specific combining ability • SSE, seed-setting efficiency.