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Four isolates of Tobacco mosaic virus (TMV-potato 1 to 4) were obtained from potato plants (Solanum tuberosum) in cultivated potato plantings in Korea. These isolates were differentiated based on biological properties, symptomatology, and nucleotide sequence analysis of the coat protein (CP) gene. TMV potato isolates caused typical symptoms on 20 inoculated plant species as compared to the type (U1) TMV strain. The four isolates each produced distinctly different symptoms on Gomphrena globosa. In contrast to the type strain of TMV, infections with two of the isolates reported here were not restricted to inoculated leaves of G. globosa but moved systemically through the plants. In addition, three additional systemic hosts (Chenopodium amaranticolor, C. quinoa, and C. murale) for TMV were revealed. Sequence analysis of the CP gene differentiated TMV-potato isolates. The CP gene sequence exhibited significant identity (83.1 to 99.2%) among TMV-potato isolates while showing 88.1 to 99.4% identities on predicted amino acid sequences. Based on a comparison of the CP gene nucleotide and deduced amino acid sequences between TMV-potato isolates and other TMV strains, TMV-potato 1, 3, and 4 were closely related to TMV strains U1, U2, V-FAVA, and NC82 with 98.8 to 100% identity. In contrast, TMV-potato 2 was closely related to TMV strains L, KP, KO-TOB, K1, and K2 with 93.8 to 98.8% identity.

Characterization of Tobacco mosaic virus Isolated from Potato Showing Yellow Leaf Mosaic and Stunting Symptoms in Korea