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Braun-Kiewnick, Andrea; Viaene, Nicole; Folcher, Laurent; Ollivier, Fabrice; Anthoine, Géraldine; Niere, Björn; Sapp, Melanie; van de Vossenberg, Bart; Toktay, Halil; Kiewnick, Sebastian
European journal of plant pathology, 01/2016, Volume: 144, Issue: 1Journal Article
Rapid and reliable tools for detection and identification of plant parasitic nematodes are needed to prevent the introduction and spread of quarantine nematodes. A fast and simple DNA extraction method for target nematodes in nematode suspensions obtained from soil samples and a new quantitative real-time PCR method (qPCR) for the specific detection, identification and potential quantification of M. enterolobii were tested in an inter-laboratory comparison (ring test) to allow for a thorough evaluation of these molecular diagnostic tools. A test performance study involving seven laboratories was conducted to validate the developed protocols and to identify possible difficulties when implemented by diagnostic laboratories or national reference centers. Validation included test performance in terms of accuracy, analytical specificity, analytical sensitivity, repeatability, and reproducibility as defined by European Plant Protection Organization (EPPO) standard PM7/98. All positive and negative results for detection, identification and specificity were consistent between different laboratories despite different equipment used. Accuracy of real-time PCR was 100 % because test results and accepted reference values were in agreement. Analytical sensitivity results also matched between laboratories independent of the equipment used. The smallest amount of target DNA tested, two second-stage juveniles of M. enterolobii in a background of 500 non-target nematodes, was reliably detected by all labs. In addition, the repeatability and reproducibility of test results between laboratories was 100 %, even at the limit of detection. Thus, the inter-laboratory comparison showed the robustness of the developed methods and confirmed the in-house validation data.
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