Abstract
In this study, genotype by environment (G × E) interaction and biological stability of resistance to Phytophthora infestans were analyzed for 22 potato cultivars, using multidimensional statistical methods. Sergen 3 computer program, based on multiplicative model was applied to analyze the G × E interaction and regression analysis. The potato cultivars were tested in four experiments in Central and South-eastern Poland over a 4 year period. The analysis of variance of rAUDPC values indicated significant (P < 0.01) influence of genotype (=cultivar) (G), year (Y), environment (E) and G × E interaction. The applying multidimensional statistical methods revealed that the most stable resistance is expressed by highly resistant cultivars Bzura, Wawrzyn, Meduza and moderately resistant ones Klepa, Jasia, Nimfy, Ania, Hinga, Vistula. For these cultivars all tested interactions (with year, location and environment) were insignificant. Such cultivars can be recommended for cultivation across all environments in Poland. In the group of unstable cultivars, two subgroups were separated: unstable and unpredictable (12 cvs.) and unstable and regular (1 cv). A different response of potato cultivars to environmental factors suggests that there is a need to select potato cultivars which are stable in terms of late blight resistance expression at various locations and years.
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