1 Genetic Analysis and RAPD Polymorphism in Some Durum Wheat Genotypes

Abstract: Three Mexican and two Egyptian durum wheat genotypes were crossed using scaling test analysis during 2005/2006, 2006/2007 and were evaluated in 2007/2008 season at Assiut. Results showed that A, B and C scaling test were highly significant for most studied traits. Meanwhile, the additive-dominance model was adequate to demonstrate the genetic variation and it important in the inheritance of no. of spikes/plant and grain yield/plant. Both additive and dominance parameters were important in the inheritance of most studied traits. But the dominant component was the largest in magnitude in most crosses for most traits studied. The epistatic effects additive x additive [i] and dominance x dominance [l] were highly significant in most cases. The additive component (D) was greater than the dominance (H) for no. of spikes/plant in cross no. 1 ( Bani-Sweef-1 X Line-2) and for grain yield/plant in crosses 1 ( Bani-Sweef-1 X Line-2) and 3 ( Sohag-3 X Line-4). Heritability values for no. of spikes/plant were low in crosses no. 1(Bani-Sweef-1 X Line-2) and 2(Sohag-3 X Line-3) and were moderately high for grain yield/plant in crosses no. 1(Bani-Sweef-1 X Line-2) and 3 (Sohag-3 X Line-4). Heterosis values over both mid-parent and the better parent were found for all studied traits. The inbreeding values were significant and coupled with a reduction in the mean of the F generation for all studied traits.2 The genotypic (GCV) coefficient of variability was relatively low for all studied traits. DNA of eleven wheat genotypes (five parental genotypes, three F crosses and three F populations) was amplified with eight1