Author/Authors :
Saad، Fawzy F نويسنده Agronomy Department, Faculty of Agriculture, Cairo University, El-Gamaa Street, P.O. Box12613 Giza , , Abd El-Mohsen، Ashraf A نويسنده Agronomy Department, Faculty of Agriculture, Cairo University, El-Gamaa Street, P.O. Box12613 Giza , , Al-Soudan، Ismaeil H نويسنده Agronomy Department, Faculty of Agriculture, Cairo University, El-Gamaa Street, P.O. Box12613 Giza ,
Abstract :
ABSTRACT: The current study aimed at assessing twelve genotypes of barley in a randomized
complete blocks design with 3 replications across 8 environments (the combinations of 2 years x 2
locations x 2 sowing dates) during 2008/2009-2009/2010 seasons in Egypt. Significant differences
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length, thousand grain weight and grain yield (ardab/fed). Combined analysis of variance of grain
yield of twelve genotypes tested in eight environments showed highly significant (p < 0.01) differences
between the genotypes, between environments and for GEI, of all traits under study, suggesting
differential response of genotypes across testing environments and the validity of stability analysis.
2 2 2 2
i di i i
CV ). According to the stability parameters, for grain yield of barley genotypes, the results revealed
that genotypes Giza 123, Giza 129, Giza 127, G4, G2, G6 and G8 were more stable genotypes for 7,
7, 7, 5, 4, 4 and 4 out of all 7 stability statistics used, respectively. Thus, these genotypes would be
considered to be more stable than others for these statistics. This implies therefore that there
genotypes are of low contribution to the genotypic by environment interaction. These genotypes may
be utilized as donor parents for stability in barley improvement programs, and could be
recommended to be as commercial stable high yielding cultivars. Highly significant rank correlations
2 2 2
di i i
detecting stable genotypes and they are equivalent in measuring stability. Hence any one of these
parameters could be used to describe genotypes stability. Our results showed that high-yielding
genotypes can differ in yield stability, and suggest that yield stability and high grain yield are not
mutually exclusive.
were observed among barley genotypes for heading date, grain filling, number of spike/m , spike
To quantify yield stability, six parametric stability statistics were calculated (b , S , R , W , S i and
i
coefficient were found among S , W and R implying their close similarity and effectiveness in
