Tobacco etch virus
| Tobacco etch virus (TEV) | |
|---|---|
| Virus classification | |
| Group: | Group IV ((+)ssRNA) |
| Family: | Potyviridae |
| Genus: | Potyvirus |
| Species: | Tobacco etch virus |
| Synonyms | |
|
datura Z virus |
|
datura Z virus
tobacco severe etch virus
tomato etch virus
Tobacco etch virus (TEV) is a plant pathogenic virus in the genus Potyvirus and the virus family Potyviridae. Like other members of the Potyvirus genus, TEV is a monopartite strand of positive-sense, single-stranded RNA surrounded by a capsid made from a single viral encoded protein. The virus is a filamentous particle that measures about 730 nm in length. It is transmissible in a non-persistent manner by more than 10 species of aphids including Myzus persicae. It also is easily transmitted by mechanical means but is not known to be transmitted by seeds.
This virus infects many species of Solanaceae. Agriculturally important crops that it infects include several species of Capsicum (i.e. C. annuum, C. frutescens), tomato (Lycopersicon esculentum), and tobacco (Nicotiana spp.).
It also infects many perennial weed species that can act as virus reservoirs for susceptible agricultural crops. These weed species include Solanum nigrum (nightshade), S. aculeatissimum (soda apple), Chenopodium album (pigweed), Datura stramonium (jimson weed), Linaria canadensis (blue toadflax), and Physalis spp. (ground cherry). Thus, recommendations for the control of this virus include the control of weeds in and around susceptible solanaceous crops.
Symptoms seen on plants infected with this virus can vary depending on the plant. However typical symptoms include vein clearing, mottling, and necrotic lines or etching. Symptoms can occur on leaves and fruit and the plants can become stunted. (See this reference for pictures of symptoms. )
Like other potyviruses, TEV makes viral inclusions that can be seen in the light microscope if properly stained. . This particular potyvirus makes two kinds of inclusions that can be diagnostic in a known host. One of the inclusions is the cylindrical inclusions found in the cytoplasm of infected cells and the second inclusion is found in the nucleus. Neither inclusion type stains in the nucleic acid stain (AzureA).
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