Estimates of genetic parameters using six populations in bread wheat

الملخص EN

Six genotypes including first and second parents, first and second retrograde crosses with first and second generations of two wheat crosses, namely Sids 12 x Sakha 93 (cross 1) and Sids 1 x Sids 14 (cross 2) were established during three successive seasons of 2016/2017, 2017/2018 and 2018/2019 at the Experimental Farm of Faculty of Agriculture, Al-Azhar University, Assiut.

obtained results showed that there were significant differences among the six populations mean of the current crosses for most studied traits, which provides the existence of genetic variation for these traits.

The additive gene effects were significant for all studied traits, except for days to 50% heading and of 100-grains weight in cross 2 and number of spikes /plant in cross 1.

The dominance gene effects were found to be significant and highly significant for most studied traits, except for days to 50% heading and number of kernels /spike in cross 2.

The additive x additive type of gene effects was positive and highly significant for plant height and grain yield/plant in the two crosses and number of spikes/plant and weight of 100 grains in cross 2.

High expected genetic advance was recorded in the second generation (F2) for grain yield per plant in the two hybrids, indicated a continuous increase in variance.

Through these studies, it can be recommended that early selection of these genotypes can be carried out to obtain a high yield