AN ANALYSIS OF THE RESPONSE OF NINE POTATO GENOTYPES TO FIVE PRAIRIE ENVIRONMENTS

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Abstract
A study of the response of the tuber and vine traits of nine genotypes (A68710–5, Acadia Russet, F74123, Min9632, Neb71.72, Norchip, Norland, Russet Burbank, and W848) to five Prairie environments (Brooks and Edmonton, Alberta; Carman and Morden, Manitoba; Outlook, Saskatchewan) over a 3-yr period was undertaken to rationalize: (1) the location of Prairie trial sites and (2) the current system of early generation selection at an irrigated site for cultivar development for both dryland and irrigated areas in the Prairie provinces. Location × genotype interactions were significant for marketable yield traits, (P < 0.01), marketable tuber number (P < 0.01), average tuber weight (P < 0.05) and vine maturity (P < 0.05). The cause of these interactions was studied by joint regression, cluster, and principal component analysis. As expected, dryland and irrigated locations were grouped together. For marketable yield, both cluster and principal component analysis indicated that Neb71.72 and Russet Burbank formed one group and the remaining seven genotypes another. For the other tuber and vine traits, the regression approach and cluster analysis were less useful. Broad-sense heritabilities were low for yield traits and high for vine maturity, specific gravity, and chip fry color. Although the number of genotypes in the study was small, the data suggest that a moderate selection pressure for yield, with more severe selection for vine maturity, specific gravity, and chip score under irrigated conditions, should not eliminate clones adapted to the dryland areas of the Prairies. The results of this study also indicate that the two Manitoba sites as well as the two irrigated sites provide essentially the same information.Key words: Genotype-environment interaction, yield traits, quality traits

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