Serological Identification of Strains of Potato Virus Y Infecting Tobacco Derived from Qiannan Guizhou Province

Two hundred and one of tobacco samples with obvious PVY symptoms were collected from Qiannan in Guizhou Province, 2010. Three strains PVY^N, PVY^O and PVY^C of PVY were detected by Tas-ELISA. The results demonstrated that the 171 of 201 samples were infected with PVY, and strain PVY^N were 37, account for 21.6%; strain PVY^O were 133, account for 77.8%; strain PVY^C were 0, and complex infection of PVY^N and PVY^O was only one, account for 0.6%. The distribution regularity of PVY strains infecting tobacco in Qiannan was that the major strain of PVY was PVY^O, and PVY^N was a secondary strain, infecting relative less. No strain PVY^C was detected, and complex infection rarely occurred.