The best known of all virus disease plants is Tobacco Mosaic Virus (TMV), distributed throughout the world. This virus affects all the dicotyledonous plants but not any monocotyledons. In a nutshell; Tobacco Mosaic Virus is one of the most stable positive sense single stranded RNA virus in genus Tobamo virus. It infects in a wide range of plants, especially tobacco and other members of Solanaceae.
Host: Nicotiana tabacum L.
Disease Cycle: The disease cycle of Tobacco mosaic virus shows in the below.
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| TMV infected leaf, Image: planetnatural.com |
Origin & History:
The discovery of viruses came about in the late 1800's when scientists were looking for the bacteria responsible for damaging tobacco plants. During one experiment in 1892, Russian biologist Dimitri Ivanovsky concluded that the disease in tobacco plants could not be caused by bacteria because it passed through a fine-pored filter that is too small for bacteria to pass through. In 1933, American biologist Wendell Stanley of the Rockefeller Institute discovered that the infectious agent formed crystals when purified. The purified extract continued to cause infection when applied to healthy tobacco plants and therefore, could not be a living organism. Soon after, scientists were able to break down the virus into its constituent parts. Today, it is known that the infectious agent that causes the disease in tobacco plants is a virus, not bacteria.
The discovery of viruses came about in the late 1800's when scientists were looking for the bacteria responsible for damaging tobacco plants. During one experiment in 1892, Russian biologist Dimitri Ivanovsky concluded that the disease in tobacco plants could not be caused by bacteria because it passed through a fine-pored filter that is too small for bacteria to pass through. In 1933, American biologist Wendell Stanley of the Rockefeller Institute discovered that the infectious agent formed crystals when purified. The purified extract continued to cause infection when applied to healthy tobacco plants and therefore, could not be a living organism. Soon after, scientists were able to break down the virus into its constituent parts. Today, it is known that the infectious agent that causes the disease in tobacco plants is a virus, not bacteria.
Causal Organism: Tobacco mosaic virus which are called Tobamo virus.
Host: Nicotiana tabacum L.
Disease Cycle: The disease cycle of Tobacco mosaic virus shows in the below.
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| Disease Cycle of TMV, Image: biologydiscussion.com |
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