Tomato torrado virus

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tomato plants with symptoms of infection by the Tomato torrado virus (left), uninfected plant at right (click on image to enlarge it)
Authors: Przemysław Wieczorek, Barbara Wrzesińska, Patryk Frąckowiak, Arnika Przybylska and Aleksandra Obrępalska-Stęplowska
Source: Virology Journal (2019), vol. 16 art. 9

Tomato torrado virus (ToTV)

This virus is found in various regions around the world, infecting tomato plants. It can also infect some other plants, including weeds. The symptoms include black necrosis at the base of the tomato leaves, about 2 weeks after inoculation. The infected plants later develop a general necrosis of the leaves and fruits, leading to a significant reduction of the market value.

The virus was first described in 2007 in Spain, based on a syndrome called 'torrado' (burned) by local farmers. The syndrome turned out to be a combined infection by ToTV and the Potexvirus Pepino mosaic virus. ToTV is usually transmitted by whiteflies like Trialeurodes vaporariorum or Bemisia tabaci in a semi-persistent manner. It can also be transmitted mechanically.

The particles are spherical, about 30 nm in diameter, with two single stranded RNA molecules, ca. 7.8 kb and 5.4 kb nucleotides in length. RNA1 contains one and RNA2 two partially overlapping open reading frames.

ToTV is the type species of the genus Torradovirus.