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Tobacco Mosaic Virus (TMV) and its Structure

Tobacco Mosaic Virus (TMV) and its Structure
Tobacco mosaic virus was discovered in 1892 by Dimitry Ivanowsky from the Tobacco plant.

Tobacco Mosaic Virus (TMV)

 

Tobacco mosaic virus was discovered in 1892 by Dimitry Ivanowsky from the Tobacco plant. Viruses infect healthy plants through vectors like aphids, locusts etc. The first visible symptom of TMV is discoloration of leaf colour along the veins and show typical yellow and green mottling which is the mosaic symptom. The downward curling and distortion of young apical leaves occurs, plant becomes stunted and yield is affected.

 

Structure

 

Electron microscopic studies have revealed that TMV is a rod shaped (Figure 1.4b) helical virus measuring about 280x150µm with a molecular weight of 39x106 Daltons. The virion is made up of two constituents, a protein coat called capsid and a core called nucleic acid. The protein coat is made up of approximately 2130 identical protein subunits called capsomeres which are present around a central single stranded RNA molecule. The genetic information necessary for the formation of a complete TMV particle is contained in its RNA. The RNA consists of 6,500 nucleotides.

 


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