Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Tobacco mosaic virus (TMV) is a non-enveloped, rod-shaped virus that infects plants, particularly tobacco and other members of the Solanaceae family. It is known for causing mosaic-like mottling on the leaves of infected plants.
5 Must Know Facts For Your Next Test
TMV was the first virus ever discovered, which helped establish virology as a scientific discipline.
It has a single-stranded RNA genome that encodes four proteins, including a replicase and movement protein.
The virus is highly stable and can remain infectious in dried plant material for years.
TMV spreads through mechanical transmission, such as when plants are handled or damaged.
Electron microscopy revealed its rod-shaped structure, measuring approximately 300 nm in length and 18 nm in diameter.