During two growing seasons in years of 2003 and 2004 potato and tobacco of virus infected plants were collected from fields in Tehran (Damavand) and Mazandaran (Behshahr) provinces. Serological methods of TAS-ELISA and DIBA were performed by using PVY antiserum (DSMZ - Plant Virus Collection; Germany) but only PVY was detected. The strain of samples was determined by using MAb of potato virus Y (AS-0403/1; DSMZ; Germany). The molecular weight of the virus coat protein was approximately 34 kDa in SDS-PAGE and Western blotting. Total RNA was extracted for RT-PCR. Immunocapture RT-PCR and RT-PCR products were 974 bp by using specific primers of PVY. IC-RT-PCR has given the best results.
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