Genotypic stability analysis of yield and related agronomic characters in wheat-Agropyron derivatives under varying watering regimes.
Genotypic stability of grain yield and yield related traits was estimated for the 8 wheat-Agropyron derivatives, 441, 442, 'Vostock', 'PPG 56', 'PPG 56SS', 449, 450 and 441SS, together with two spring wheat controls, 'Drabant' and 'Sv 01382', grown under varying watering regimes for two years. Differences among environments, genotypes and their interactions were highly significant for all traits. The genotypes X environments linear response were significant for number of spikelets per main spike, grain number per main spike and single grain weight. No significant linear responses were detected for grain yield or the rest of yield related traits. Deviations from linear responses were highly significant for all traits under study. Grain yield stability was not associated with the stability of yield components. 'PPG 56SS' was identified as the stable variety with the highest mean grain yield per plant under the severe stress environment. Mean grain yields in the severe stress environment were correlated with the genotypic stability parameter "α". The severe stress environment was recognized as the optimum test environment. The study revealed a shift in the association between grain yield per plant and its components under the varying environments.
Institute of Genetics, University of Lund, S-223 62, Lund, Sweden.
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Moneim Babu Fatih