Genetical Analysis of F2 Hybrids from Diallel Crosses in Bread Wheat Triticum aestivum

The F2 generation from half diallel crosses between five varieties of bread wheat (Triticum aestivum L.) (Intesar, Rabbeaa, Abu-Greeb-3, Adnanyi and Al-Eas) were used to estimate general combining ability for parental varieties, specific combining ability for their half diallel crosses in F2 generation, Inbreeding depression in F2 generation and Broad sense heritability for the following traits : plant height, number of tillers, number of spikes per plant , spike length , number of grains per spike, 100 seeds weight and grain yield per plant. The results indicated that there were additive and non- additive gene effect for all the studied traits. The non- additive gene effects is more important than the additive for determining these characters.
Some of hybrids showed positive values and significant Inbreeding depression F2 generation for studied traits on the other hand, some hybrids showed negative values and significant inbreeding depression in F2 generation for this studied traits.
Broad sense heritability estimate were high for: plant height, number for tillers per plant, number of spikes per plant, spike length, grain yield per plant, Medium for 100-grain weight, and low for number of grains per spike.