Germplasm potential for trait improvement in upland cotton: Diallel analysis of within-boll seed yield components
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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. Crop Science Society of America.