|Pappu, H. - WA STATE UNIV, PULLMAN|
|Druffel, K. - WA STATE UNIV, PULLMAN|
|Pavek, M. - WA STATE UNIV, PULLMAN|
Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: March 16, 2007
Publication Date: July 1, 2007
Citation: Pappu, H., Druffel, K., Whitworth J. and Pavek, M. 2007. Incidence, transmission and molecular characterization of Potato virus S from selected potato cultivars in Washington State. Phytopathology 97:S89 (Abstract) Technical Abstract: The Washington State Potato Seed Lot Trials annually evaluates seed lots from several states for the incidence of various potato viruses and other growth compromising factors. During the 2005 and 2006 seasons, many plants within seed lots of cv. Defender displayed necrotic lesions, leaf malformation and severe stunting, similar in appearance to severe PVY symptoms that are occasionally seen in varieties like Ranger Russet and Umatilla Russet. Laboratory testing of these symptomatic plants of Defender for all known potato viruses showed that the plants were infected with <ital>Potato Virus S</ital> (PVS) and none of the other known potato viruses. Other cultivars such as Russet Burbank, Norkotah and Shepody were also found infected with PVS but they showed only mild mosaic or no symptoms. PVS was found to be tuber-borne and produced similar necrotic reaction in Defender plants grown from tubers of field-grown plants. The complete genome of the PVS isolate from Defender was cloned and sequenced and the genome organization conformed to that of a typical carlavirus.