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In Apr. 2008, commercially purchased processed potato chips were observed with dark brown arcs and rings typical of corky ringspot disease. This disease is caused by infection with tobacco rattle virus (TRV). A portion of RNA 1 of TRV was amplified by reverse transcription polymerase chain reaction (RT-PCR) from each of eight discolored chips from three different bags purchased at three locations. Sequence analysis of the 463-bp amplicons confirmed that the products were indeed TRV in origin and were 97% identical to TRV sequences of isolates originating in Washington, Florida, and Wisconsin. Extracts from the symptomatic RT-PCR-positive chips were not infectious when mechanically inoculated onto tobacco leaves. To the author's knowledge, this is the first report of the detection of plant virus RNA in a food product after high-temperature frying.

Detection of Tobacco Rattle Virus RNA in Processed Potato Chips Displaying Symptoms of Corky Ringspot Disease