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Etiology

Host Range and Properties of a Strain of Tobacco Streak Virus From Potatoes. L. F. Salazar, Virologists, The International Potato Center, Apartado 5969, Lima, Perú; J. A. Abad(2), and W. J. Hooker(3). (2)(3)Virologists, The International Potato Center, Apartado 5969, Lima, Perú. Phytopathology 72:1550-1554. Accepted for publication 10 May 1982. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-1550.

A virus, coded SB 10, was isolated from potato plants with mild mosaic symptoms. The host range and properties of SB 10 resemble those of tobacco streak virus (TSV). Serological studies and comparative host range with two strains of TSV demonstrated that SB 10 is a new strain. SB 10 is serologically more closely related to TSV-B (originally isolated from soybeans in Brazil) than to the type strain TSV-HF. When inoculated onto potatoes, SB 10 generally causes a mild mosaic or symptomless infection. Progeny tubers from infected mother plants were, except in two clones, virus-free. The virus is probably not a threat to potato production. The virus is readily transmitted through seeds of Nicandra physalodes and Chenopodium quinoa. Enzyme-linked immunosorbent assay (ELISA) can be used to detect the virus at a concentration of 1 ng/ml or in infected C. quinoa sap diluted 10^–5.