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Development of loop‐mediated isothermal amplification assay for the detection of P ythium myriotylum
Author(s) -
Fukuta S.,
Takahashi R.,
Kuroyanagi S.,
Ishiguro Y.,
Miyake N.,
Nagai H.,
Suzuki H.,
Tsuji T.,
Hashizume F.,
Watanabe H.,
Kageyama K.
Publication year - 2014
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/lam.12244
Subject(s) - loop mediated isothermal amplification , primer (cosmetics) , biology , microbiology and biotechnology , physics , dna , genetics , thermodynamics
This study reports the development of a loop‐mediated isothermal amplification ( LAMP ) reaction for the detection of P ythium 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 P ythium 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 . Significance and Impact of the Study This study shows the first LAMP assay for the detection of Pythium myriotylum . The primer set designed from ITS region of P. myriotylum can detect the pathogen in field sample with a fast and convenient method. Analysis of the annealing curve of the LAMP reaction products increases the reliability of the LAMP diagnosis. This study shows that the diagnostic method using the LAMP assay is useful for monitoring P. myriotylum in the field.