Abstract
A technique based on the use of specific primers for polymerase chain reaction (PCR) was developed for the identification of the stem and bulb nematode belonging to the Ditylenchus dipsaci species complex. The internal transcribed spacer region ITS1 and ITS2, the gene 5.8 S and part of genes 18 S and 26 S of twenty populations of the D. dipsaci species complex belonging to both D. dipsaci sensu stricto and Ditylenchus sp. B (corresponding to populations of giant individuals associated to Vicia faba) and three congeneric species were amplified with two universal ribosomal primers. PCR-amplified DNA samples were digested with five restriction enzymes in order to reveal some polymorphism allowing the identification of D. dipsaci populations associated with Fabaceae seeds. The polymorphism among species was confirmed by the sequencing of the PCR products. A primer (DdpS2) was designed in a region conserved in all populations of both D. dipsaci sensu stricto and D. sp. B studied in the present work. The other Anguinidae species (except a few species from Central Asia associated to Astereaceae and D. sp. G associated to Plantago maritima) differ in two to four nucleotides at the 3′ extremity of this region. This sequence portion coincides with a TspEI restriction site. In combination with a primer located in the ribosomal region, this first primer is a good candidate for identification by PCR of populations of the D. dipsaci species complex found in Fabaceae seeds. A second primer (DdpS1) was designed in a similar way and was specific to D. dipsaci sensu stricto. The utility of these two sets of primers is discussed against the background of quarantine regulation.
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Abbreviations
- rDNA:
-
Ribosomal DNA
- SCAR:
-
Sequence characterized amplified regions
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Acknowledgements
This study was supported by a CTPS Programme (Comité Technique Permanent de la Selection des plantes cultivées) of the French Ministry of Agriculture (Ministère de l’Agriculture, de l’Alimentation, de la Pêche et des Affaires Rurales) entitled ‘Mise au point d’un test PCR pour la détection sur semences de luzerne du nématode Ditylenchus dipsaci’. MK was supported by a postdoctoral fellowship from Institut National de la Recherche Agronomique (INRA). We thank Alex Mc Donald (Potchefstroom, Republic South Africa) for providing the D. africanus nematode isolate, and Jean-Pierre Paulin for critical reading of the manuscript.
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Kerkoud, M., Esquibet, M., Plantard, O. et al. Identification of Ditylenchus species associated with Fabaceae seeds based on a specific polymerase chain reaction of ribosomal DNA-ITS regions. Eur J Plant Pathol 118, 323–332 (2007). https://doi.org/10.1007/s10658-006-9092-6
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DOI: https://doi.org/10.1007/s10658-006-9092-6