Abstract
Abstract Bursaphelenchus species can cause serious economic damage to pine forestry, and are widely distributed across the globe. The genetic structure of the B. mucronatus-B. xylophilus species group was investigated using sequences of the internal transcribed spacers of the ribosomal RNA gene repeat as a marker. Analysis of the ITS from 11 Bursaphelenchus isolates, using Aphelenchoides rhytium as an outgroup, supports the perception that the two species are distinct genetic entities. Significant divergence was however found within each species. ITS sequence analysis does not support a separation of European and Japanese B. mucronatus into distinct species-level taxa. Phylogenie des especes de Bursaphelenchus issue d'une analyse des sequences du DNA ribosomique de l'espaceur interne transcrit - Les especes de Bursaphelenchus peuvent provoquer de serieux degats aux cultures de pins et sont largement reparties dans le monde. La structure genetique des especes du groupe B.mucronatus-B. xylophilus a ete etudiee en utilisant comme marqueur des sequences repetees de l'espaceur interne transcrit du gene de l'ARN ribosomique. L'analyse des ITS de 11 isolats de Bursaphelenchus, en utilisant Aphelenchoides rhytium comme un extra-groupe, conforte l'idee que les deux especes sont des entites genetiques distinctes. Une divergence significative a cependant ete trouvee a l'interieur de chaque especes. L'analyse des sequences des ITS n'accredite pas la separation des B. mucronatus europeen et japonais en deux especes distinctes.
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