Quantitative traits inheritance in three bread wheat crosses [electronic resource].

Includes references.

Three field experiments were carried out, using the six populations (P1, P2,F1,F2, Bc1 and Bc2) method to study the inheritance of some quantitative traits in three bread wheat (Triticum aestivum L.)crosses; namely. (1) Giza 168 x Sakha 94, (2) Irena x Giza 168 and (3) Irena x Gemmeiza9, in three winter seasons (2009/2010, 2010/2011 and 2011/2012). Results indicated significant positive heterotic effects for all characters in the first cross, kernel weight in the second cross and grain yield/plant in the third cross. On the other hand, significant negative heterotic effects were detected for number of spikes/ plant, number of kernels/ spike and kernel weight in the third cross, and grain yield/ plant in the second cross. Heterotic increases, also, were evident for number of spikes/ plant and number of kernels/ spike, which might be accounted for the heterotic response, observed in the first cross. Inbreeding depression was significant for all characters, except for number of kernels/ spike and kernel weight in the second cross. There were overdominance effects towards the higher parent for all studied characters in the first cross, grain yield/ plant in the second and third crosses and kernel weight in the second cross. Meanwhile, ovcrdominance towards the lower parent was found for number of kernels/ spike in the second cross. Complete dominance was found for both number of spikes/ plant and 1OO-kernel weight in the third cross, whereas, partial dominance was estimated towards the higher parent, for number of kernels/ spike in the third cross.

Summary in Arabic.

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