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Isoelectric focusing of general protein and specific enzymes from pathotypes of Globodera rostochiensis and G. pallida

SUMMARY Variations in the general protein and 40 enzymes of the 8 European pathotypes of the potato cyst nematode Globodera rostochiensis and G. pallida have been examined by isoelectric focusing (IEF) and cluster analysis. Differences in the protein patterns were observed and the presence of a major band at pH 8·0 allowed the two species to be discriminated. Extra isozymed of peptidase (EC 3.4. 11.*) and esterase (EC 3. 1. 1. 1) were also found in G. rostochiensis. Intra-species variation was seen within G. rostochiensis for superoxide dismutase (EC 1. 15. 1. 1) and within G. pallida for phosphoglucomutase (EC 2. 7. 5. 1) and glucose phosphate isomerase (EC 5. 3. 1. 9). The results suggest that the two species are very similar and the prospect for recognizing their pathotypes by IEF is discussed.