Abstract
Expansins are a group of plant cell wall loosening proteins found among the parasitism factors or effectors of plant-parasitic nematodes. Molecular variability of the expansin B2 (expB2) gene and its predicted protein was evaluated in populations of the potato cyst nematode Globodera rostochiensis in order to find a link to the pathotypes of potato cyst nematodes. Although considerable variability was determined, no correlation could be established between these polymorphisms and pathotype classification. Our results suggest that some of the observed variability could be explained by the existence of a Gr-expB2 family with very similar intron lengths and positions.
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