Abstract
The stability and genotypic mean of four traits, grain yield, grain protein content, alveograph W and bread volume, were evaluated in three multi-location trials, each covering two years. The stability of each genotype was evaluated by environmental variance (s2 E), interaction variance (s2 W) and variance of the ranks of the phenotypic values corrected for the genotypic effect (s2 R). The bootstrap method was used to study correlations between the genotypic mean and the three stability statistics and to calculate their accuracy. The repeatability of the stability statistics was measured by correlations between the values obtained in each of the two years. In addition, theoretical smaller trials were generated by random sampling and the stability values calculated were correlated with those of the original trial. Environmental variance appears to be usable both for yield and for quality traits, but there is a risk of counter-selecting a high genotypic mean of W. Whatever the trait and statistic envisaged, stability is poorly repeatable and its evaluation requires several years and a large number of locations per year to minimise sampling and environmental effects.
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Robert, N. Comparison of stability statistics for yield and quality traits in bread wheat. Euphytica 128, 333–341 (2002). https://doi.org/10.1023/A:1021296919225
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DOI: https://doi.org/10.1023/A:1021296919225