Which is responsible for mosaic disease in tobacco?

Tobacco mosaic is caused by Tobacco mosaic virus (TMV), the first virus ever identified. Numerous variants (strains) of the virus have subsequently been described. TMV survives in infected plants (including viable seeds), as well as in debris from these plants.

What is mosaic disease caused by?

mosaic, plant disease caused by various strains of several hundred viruses. A number of economically important crops are susceptible to mosaic infections, including tobacco, cassava, beet, cucumber, and alfalfa.

What is the origin of tobacco mosaic virus?

Two scientists contributed to the discovery of the first virus, Tobacco mosaic virus. Ivanoski reported in 1892 that extracts from infected leaves were still infectious after filtration through a Chamberland filter-candle. Bacteria are retained by such filters, a new world was discovered: filterable pathogens.

Who discovered mosaic disease of tobacco?

Tobacco mosaic virus occupies a unique place in the history of virology and was in the forefront of virus research since the end of the nineteenth century. It was the German Adolf Mayer, working in the Netherlands, who in 1882 first described an important disease of tobacco which he called tobacco mosaic disease.

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What will happen to tobacco plants if infected by tobacco mosaic virus?

Symptoms induced by Tobacco mosaic virus (TMV) are somewhat dependent on the host plant and can include mosaic, mottling (Figures 1 and 2), necrosis (Figures 3 and 4), stunting, leaf curling, and yellowing of plant tissues.

Where is tobacco mosaic virus found?

The virus particles are found in all parts of the plant except the few cells at the tips of the growing points. Infected stock plants should be discarded immediately. TMV can also survive outside the plant in sap that has dried on tools and other surfaces.

Who is the discoverer of virus?

In 1892, Dmitri Ivanovsky used one of these filters to show that sap from a diseased tobacco plant remained infectious to healthy tobacco plants despite having been filtered. Martinus Beijerinck called the filtered, infectious substance a “virus” and this discovery is considered to be the beginning of virology.

Who is father of virus?

Martinus Beijerinck is often called the Father of Virology. Beijerinck’s laboratory grew into an important center for microbiology.

Who discovered tobacco?

Tobacco was first discovered by the native people of Mesoamerica and South America and later introduced to Europe and the rest of the world. Archeological finds indicate that humans in the Americas began using tobacco as far back as 12,300 years ago, thousands of years earlier than previously documented.

Who discovered virus in 1892?

In 1892, Ivanovski demonstrated the presence of infectious agents, coined ‘virus’ by Beijerinck in 1898, in filtrate of infected leaves passed through a Chamberland filter. This marks the discovery of the tobacco mosaic virus [27] and the birth of a new era in virology.

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Who named bacteriophage?

D’Hérelle coined the term bacteriophage, meaning “bacteria eater,” to describe the agent’s bacteriocidal ability. Bacteriophages also infect the single-celled prokaryotic organisms known as archaea.

Which of the following host plant is caused by tobacco mosaic virus?

What is TMV? TMV is a single-stranded RNA virus that commonly infects Solanaceous plants, which is a plant family that includes many species such as petunias, tomatoes and tobacco.

How does the tobacco mosaic virus replicate?

The replication of tobacco mosaic virus (TMV) RNA involves synthesis of a negative-strand RNA using the genomic positive-strand RNA as a template, followed by the synthesis of positive-strand RNA on the negative-strand RNA templates.

What is tobacco mosaic virus structure?

Tobacco mosaic virus (TMV; Tobamovirus, Virgaviridae) is a rodlike virus with a length of 300 nm and diameter of 18 nm. TMV capsids are composed of 2130 identical protein subunits, which assemble around the viral ssRNA to form a helical structure, with a hollow central cavity of 4 nm diameter.