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Developing a Real-Time PCR Assay for Detection and Quantification of Pratylenchus neglectus in Soil

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https://ir.library.oregonstate.edu/concern/articles/hq37vp19d

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  • Pratylenchus neglectus is one of the most widespread and economically important nematodes that invades plant roots and restricts wheat productivity in the Pacific Northwest. It is challenging to quantify P neglectus using microscopic methods for studies that require large-scale sampling, such as assessment of rotation crops, wheat cultivars, and other management practices. A real-time quantitative polymerase chain reaction (qPCR) assay was developed to detect and quantify P. neglectus from DNA extracts of soil. The primers, designed from the internal transcribed spacer region of rDNA, showed high specificity with a single melt curve peak to DNA from eight isolates of P. neglectus but did not amplify DNA from 28 isolates of other plant-parasitic and non-plant-parasitic nematodes: A standard curve (R-2 = 0.96; P < 0.001) was generated by amplifying DNA extracted from soil to which nematodes were added. The soil standard curve was validated using sterilized soil inoculated with lower numbers of P. neglectus. A significant positive relationship (R-2 = 0.66; P < 0.001) was observed for nematode numbers quantified from 15 field soils using qPCR and the Whitehead tray and microscopic method but the qPCR generally tended to provide higher estimates. Real-time PCR potentially provides a useful platform for efficient detection and quantification of P. neglectus directly from field soils.
  • Keywords: Verticillium dahliae, Fragment length polymorphism, Root lesion nematodes, Potato cyst nematode, Northwest United States, Pacific Northwest, Polymerase chain reaction, Genus pratylenchus, Quantitative detection, DNA
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  • Yan, G., Smiley, R., Okubara, P., Skantar, A., & Reardon, C. (2013). Developing a real-time PCR assay for detection and quantification of pratylenchus neglectus in soil. Plant Disease, 97(6), 757-764. doi:10.1094/PDIS-08-12-0729-RE
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  • 97
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  • 6
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  • This research was funded by the Idaho Wheat Commission, Oregon Wheat Commission, and Washington Wheat Commission; a cooperative agreement between Oregon State University and the United States Department of Agriculture–Agricultural Research Service (USDA-ARS) (SCA 58-5348-9-100, “Control of Root Diseases of Wheat and Barley”); and USDA-ARS Project number5248-22000-012-00D (P. A. Okubara).
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