GENOTYPE X ENVIRONMENT INTERACTION FOR RESISTANCE TO THE WHITE POTATO CYST NEMATODE (GLOBODERA-PALLIDA, PATHOTYPE-E) IN SOLANUM-VERNEI X SOLANUM-TUBERCSUM HYBRIDS

The standard root-ball test for assessing quantitative resistance of Globodera pallida in host material derived from Solanum vernei has produced variable results. This study of two sets of clones shows that genotype x environment interactions are responsible and that linear regressions (b) of phenotypic means on environments may enable good predictions to be made of the effects of the interactions. A relationship between the regression value (b) and phenotypic mean is shown for this material. The implication of this for a screening procedure in a potato breeding programme aimed at increasing potato cyst nematode resistance in adapted cultivars of S. tuberosum is discussed. © 1979 H. Veenman En Zonen B.V.