Rapid and low-cost diagnosis of Japanese yam mosaic virus infection in Chinese yam (Dioscorea polystachya) leaves by a print-capture RT-PCR

A rapid diagnostic method for Japanese yam mosaic virus (JYMV) infection in Chinese yam ( Dioscorea polystachya ) by a print-capture RT-PCR was developed. The cut surface of a rolled leaf of a JYMV-infected Chinese yam was stamped onto a nitrocellulose membrane. The clipped membrane was boiled in eluting solution to elute the RNA for use as the template in RT-nested PCR. Although JYMV RNA was detectable in most infected plants in the first PCR of the print-capture RT-PCR, it was detected from all samples in the nested PCR. The tissue-printed membranes could be preserved for at least 3 months at 4 °C for JYMV detection.