التحليل الوراثي للمقدرة الاتحادية في حنطة الخبز ( Triticum aestivum L. ) باستخدام التهجينات التبادلية

Five varieties of bread wheat (Triticum aestivum L.) (Intesar, Rabbea’a, Abu-Chreebe-3, Adnaniya and Al-Eaz) and their half diallel crosses were used to study general varietiey (GCA) and specific combining ability (SCA) for plant height, number of tillers number of spikes per plant, spike length, number of grains per spikes, 100 -grains weight and grain yield per plant. The results showed that the (GCA) and (SCA) variances were highly significant for the studies characters except for grain yield per plant which was significant. The ratio between the variance component of (GCA) and the variance component of (SCA) was less than one for all studied quantitative characters except for plant height which was more than one, this indicates the presence of additive and non-additive gene effects on all the studied quantitative characters, but the non-additive gene effects is more important for determining these characters. The largest and positive value for (GCA) effects was in the following parental varieties: Abu-Ghreeb-3 for plant height and number of grain per spike, Adnaniya for number of tillers and spike length and 100 grain weight and Rabbea’a for number of spikes per plant and grain yield per plant.