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Identification of cyst forming nematodes of the genus Heterodera (Nematoda: Heteroderidae) based on the ribosomal DNA-RFLP

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For more content, see Nematologica.

Amplified ITS region products of rDNA from 25 valid species and one unidentified species from the genus Heterodera and from Meloidodera alni were digested by 26 restriction enzymes. A combination of seven enzymes clearly separated the agriculturally most important species from each other and from their sibling species. Species specific digestion profiles of ITS regions and a table with approximate sizes of digested fragments for several identification enzymes are given. Heterogeneity of ITS regions was revealed for some cyst forming nematode species.

Des fragments amplifiés de la région de l’ITS du rDNA de 25 espèces valides et d’une espèce non identifiée du genre Heterodera et de Meloidodera alni ont été soumis à une digestion par 26 enzymes de restriction. La combinaison de sept enzymes a permis une séparation nette des espèces les plus importantes en agriculture, tant les unes par rapport aux autres que par rapport aux espèces jumelles. Sont donnés les profils spécifiques de digestion des régions de l’ITS et un tableau regroupant les tailles approximatives des fragments digérés pour plusieurs enzymes d’identification. L’hétérogénéité des régions de l’ITS a été révélée chez quelques espèces de nématodes à kyste.


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