Genotype by environment interactions and its implications in stability of wheat genotypes [electronic resource].

Includes reference.

Twenty-four genotypes of wheat (Triticum aestivum L) include twenty promising genotypes and four commercial cultivars were evaluated at three Agricultural Research Stations, Etay-El-Baroud, Mallawy and Nubaria, for two growing seasons 2004/2005 and 2005/2006 (six environments) for their phenotypic stability. Using several parameters of stability included modified superiority index and three different indexes. The results can be summarized as follows:- 1-Highly significant differences among wheat genotypes were detected at each environment. Analysis of variance for combined data across environments showed that genotypes, environments and genotypes X environments were highly significant for all the studied traits. 2- There were 12 wheat genotypes had grain yield higher than grand mean over all environments. 3- Generally, mean grain yield at Nubaria region was lower than other two regions. 4- In the selection process a genotype were selected when recorded score of 50% or more in each index. The tested wheat genotypes based on four indexes of stability classified into four groups. 5- This classification of wheat genotypes allows choice of genotypes which have a low probability to produce poor yield under harsh environments condition, and provide knowledge of the magnitude and cause of the environmental effects in wheat breeding program.

Summary in Arabic.

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