Genetic differentiation between resistance phenotypes in the phytophagous flea beetle, Phyllotreta nemorum.

摘要: The flea beetle Phyllotreta nemorum L. (Coleoptera: Chrysomelidae) is genetically polymorphic for resistance against the defences of one its host plants, Barbarea vulgaris R.Br. (Brassicales: Brassicaceae). Whereas resistant beetles are able to use B. as well other cruciferous plants food, non-resistant cannot survive on vulgaris. This limitation plant could potentially lead asymmetric gene flow and some degree genetic isolation between different resistance-genotypes. Therefore, we studied extent differentiation at neutral allozyme loci samples that were collected locations first tested phenotype. Since earlier work has shown a weak, but significant, effect geographical distance their differentiation, in present study variation P. was partitioned resistance-phenotype. Both sources independently contributed statistically significantly population differentiation. Thus, there appears be exchange when corrections made geographic consistent with presence race formation this beetle.