The genetic performance of some continuously variable characteristics of pea under different locations
2005
Zayed, Gamal A. | Helal, Fawzeya A. | Farag, Samar T
The combined analysis of variance over the Upper and Lower Egypt locations indicates significant differences between locations for all the studied traits. Highly significant differences among the effect of genotype x location interaction were detected for all studied traits except pod length. It would be necessary to test genotypes in more than one environment with great emphasis on location testing in the general breeding program to select the best genotype suitable for particular environment. There is an urgent demand for breeding of new genotypes with higher yield of better quality under the Upper Egypt conditions. Victory Freezer and Master B cvs. could be used directly or through breeding program in improving pea productivity under the investigation regions. The maximum significant heterosis in desirable direction was recorded for fresh pod yield/fed. followed by earliness in El-Gharbia (Lower Egypt) location and both fresh pod yield/fed. and number of seeds/pod in Upper Egypt. Different types of dominance were exhibited in both locations for all traits except plant height, pod length and number of pods/plant, which exhibited partial dominance in all crosses of both locations. The predominance of additive and additive x additive types of gene action were not influenced by environmental changes and intra population selection would only be effective for improving the earliness. However, the improvement in either plant height or number of pods/plant in El-Ghaibia location may be achieved by delaying the selection to later generation when dominance gene actions disappear and the additive gene accumulation increase through recurrent selection.
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