الفهرس 
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Abstract
In this study, two main research objectives were conducted; genotypic variation for cottonseed quality traits during 2012 season using accelerated aging procedure and genetic study for these traits during 2013 season using half diallel analysis. The mean performances for seed quality traits at eleven treatments revealed that G.90 and G.92 were significantly exceeded their grand mean than the remaining genotypes under accelerated aging for seedling growth traits. The stress susceptibility index indicated that the genotypes G.70 for electrolyte leakage, G.74 for seed imbibing%, G.80 for germination %, G.75 for seedling length, G.77 for seedling vigor index, 6022 for seedling fresh weight and C.B58 for seedling dry weight had less affected by accelerated aging treatment than the remaining genotypes. Parental genotypes G.85 for protein%, germination %, seedling fresh weight and seedling dry weight; G.70 for electrolyte leakage and seed imbibing % and G.88 for oil% and acid value may be excellent combiners in a breeding program toward improving seed quality traits. Additive and dominance components of genetic variance were involved in expression of electrolyte leakage and acid value at the two treatments. Also, additive component was larger than dominance effect for germination %, seedling length, seedling fresh weight and seedling dry weight at accelerated aging treatment, suggesting that additive gene action played a predominant role in the inheritance of these four traits.