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Development of loop-mediated isothermal amplification assay for the detection of Pythium myriotylum

Letters in Applied Microbiology, ISSN: 1472-765X, Vol: 59, Issue: 1, Page: 49-57
2014
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This study reports the development of a loop-mediated isothermal amplification (LAMP) reaction for the detection of Pythium myriotylum. The primer set targeting the ITS sequence of P. myriotylum worked most efficiently at 60°C and allowed the detection of P. myriotylum DNA within 30 min by fluorescence monitoring using a real-time PCR instrument. The peak denaturing temperature of amplified DNA was about 87·0°C. In specificity tests using eight Pythium myriotylum strains, 59 strains from 39 species of Pythium, 11 Phytophthora strains and eight other soil-borne pathogens, LAMP gave no cross-reactions. The detection limit was 100 fg of genomic DNA, which was as sensitive as PCR. LAMP could detect P. myriotylum in hydroponic solution samples, and the results coincided with those of the conventional plating method in almost all cases. The LAMP method established in this study is a simple and sensitive tool for the detection of P. myriotylum. © 2014 The Society for Applied Microbiology.

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