Genetic analysis of seed density and kernal percentage at different developmental stages in upland cotton (Gossypium hirsutum L.)

The results indicated that the magnitude and direction of genetic effects varied in different developmental stages. Direct additive effects were significant for seed density at early stages, reaching its maximum at 40 days, but maternal effects significantly existed at seed maturation period. For kernel percentage, the main component was of cytoplasm effects at 20 days after blooming, but of maternal dominance effects at 30 days and 40 days after blooming. All highly significant effects were detected at seed maturing.