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Reverse Transcription Loop-Mediated Isothermal Amplification of DNA for Detection of Potato virus Y

A reverse transcription loop-mediated isothermal amplification of DNA (RT-LAMP) for detection of Potato virus Y (PVY) was developed. In this procedure, a set of four primers matching a total of six sequences of the coat protein (CP) gene of PVY were designed in such a way that a loop could be formed and elongated during DNA amplification. Using PVY CP complementary DNA clones as templates, the LAMP reaction was optimized by adjusting the concentrations of MgSO₄, dNTPs, and Bst DNA polymerase. The effects of fragment length of target DNA on LAMP also were investigated. Two-step and one-step RT-LAMPs were performed using RNA extracts of various PVY cultures, and the results were correlated with two-step reverse transcription polymerase chain reaction (RT-PCR) for detection of PVY. Further, the turbidity caused by precipitation of magnesium pyrophosphate formed in positive RT-LAMP reactions was used to measure the amplification by utilizing a time-saving spectrophotometric method. The one-step RT-LAMP-turbidity method gave results comparable with the two-step RT-PCR method for detection of PVY from potato leaf and tuber samples. Of the total 240 samples, 234 were diagnosed similarly by both methods.