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Environmental Interactions in the Assessment of Partial Resistance To Potato Cyst Nematodes

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For more content, see Nematology.

The multiplication rates of six populations of Globodera pallida on two susceptible cultivars and six clones with partial resistance derived from Solanum vernei were compared at two centres. Differences were obtained between populations but the results at each centre were similar. Two of the populations multiplied significantly less well at both centres on one of the susceptible cultivars and, with the exception of cv. Darwina which was much less resistant in both absolute and comparative terms at one of the centres, the populations ranked the resistances of the clones in a similar order. The results were also used to compare virulence differences between populations. Because of differences in overall multiplication rates the susceptible cultivars were used as a basis for calculating percentage virulence. Although the actual values obtained differed between centres, the populations were ranked in a similar order. An analysis of further sets of data confirmed that, provided the average derived from tests on a number of clones was used, the ranking of clearly distinct populations was consistent. The results support the view that certain clones and populations should be used as standards in tests to determine categories of resistance and virulence.

Affiliations: 1: ) Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, Scotland; 2: ) Biol. Bundesanstalt, Institut für Nematologie, Toppheideweg 88, D-4400 Münster, Fed. Rep. Germany


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