تقدير مكونات التباين الظاهري، التوريث، معدل درجة السيادة و التحسين الوراثي للأجيال المبكرة من حنطة الخبز (Triticum aestivum L.)‎

Abstract EN

Six early generation (B2,B1,F2,F1,P2,P1) of two crosses of bread wheat (Triticum aestivum L.) the first (Intesar × Rabbeaa) and the second (Abo-Greab-3 × Adnanyi) were used to estimate the components of phenotypic variance, heritability, average degree of dominance and expected genetic advance for plant height, number of tillers per plant, grain yield and its components for each cross.

The result revealed that additive genetic variance was significant for number of grains per spike, 100 grain weight and grain yield in both crosses while the dominance genetic variance was significant for spike length in the first cross.

The studied traits revealed all types of dominance heterosis can be utilized for improve number of tillers per plant in both crosses, plant height, spike length in first cross, number of spike per plant in second cross.

The values of broad sense heritability was high for all studied traits in both crosses, the values of narrow sense heritability were high and significant for number of grains per spike, 100 grain weight and grain gield per plant in both crosses, number of spike per plant in first cross, spike length in second cross, medium for plant height and number of tillers per plant in both crosses.

The values of expected genetic advance as a percentage of the mean were for number of spikes per plant, 100 grains weight and grain yield per plant in both crosses which indicated that selection in the second filial generation will be effective to improved those traits.