mosaic pattern of light and dark green (or yellow and green) on the leaves. malformation of leaves or growing points. yellow streaking of leaves (especially monocots) yellow spotting on leaves.
What is the structure of the tobacco mosaic virus?
Tobacco mosaic virus has a rod-like appearance. Its capsid is made from 2130 molecules of coat protein and one molecule of genomic single strand RNA, 6400 bases long.
What do you know about tobacco mosaic?
THE TOBACCO MOSAIC VIRUS
Tobacco mosaic virus causes a mottled browning of tobacco leaves, and accordingly is of major economic importance. It also infects other crops, most notably tomatoes. The virus is spread mechanically from infected plants to scratched or damaged leaves of normal plants.
What are the causes of tobacco mosaic virus?
Disease Cycle and Epidemiology
TMV is very easily transmitted when an infected leaf rubs against a leaf of a healthy plant, by contaminated tools, and occasionally by workers whose hands become contaminated with TMV after smoking cigarettes. A wounded plant cell provides a site of entry for TMV.
What causes a mosaic pattern on leaves?
The tobacco mosaic virus infects tobacco and lots of other closely related species like tomatoes and peppers. It is transmitted by contact between plants, either naturally or on the hands of farmers. It infects the chloroplasts of plant leaves and changes their colour from green to yellow or white in a mosaic pattern.
What are viruses describe the character of TMV?
Tobacco Mosaic Virus (TMV) or satellite TMV is a positive-sense single stranded RNA virus that infects plants, especially tobacco and other members of the family Solanaceae. The infection causes characteristic patterns, such as “mosaic”-like mottling and discoloration on the leaves (hence the name).
Is tobacco mosaic virus filamentous?
Filamentous viruses, particularly tobacco mosaic virus (TMV), have been important in developing fibre diffraction methods, and fibre diffraction allowed TMV to be among the first virus structures determined.
What are the two major components of the tobacco mosaic virus?
Tobacco mosaic virus (TMV) is named for one of the first plants in which it was found in the 1800s. However, it can infect well over 350 different species of plants. TMV is made up of a piece of nucleic acid (ribonucleic acid; RNA) and a surrounding protein coat.
Is tobacco mosaic prokaryotic or eukaryotic?
Eukaryotes are diploid and the DNA is organized into the multiple linear chromosomes and found in the nucleus. The tobacco Mosaic virus genome consists of the single-stranded RNA (ssRNA) which is 6400 bases long. The RNA is protected by a coat protein from cellular degradation.
What does the tobacco mosaic virus look like?
Tobacco mosaic virus is not as distinct as other viruses, but yellow-green mottling on leaves is the most characteristic symptom of the disease. Infected plants have stunted growth, and flowers and leaflets may be curled, distorted, and smaller than normal in size. Open blooms may have brown streaks through them.
How is tobacco mosaic prevented?
To control the spread of TMV, farmers must: wash their hands after handling infected plants. wash tools that have come into contact with infected plants in detergent or bleach. rotate the crops they grow in a contaminated field – they must not grow tobacco or tomato plants in the field for at least two years.
What type of genetic material is found in tobacco mosaic virus?
The genetic material in Tobacco Mosaic Virus is RNA.
What plants are affected by tobacco mosaic virus?
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 tobacco mosaic virus affect photosynthesis?
TMV infects the chloroplasts of plant leaves and reduces the plant’s ability to photosynthesise . The leaves change colour from green to yellow or white and develop a mosaic pattern. It can also make leaves crinkled or curled up.
How does tobacco mosaic virus damage the plant?
Tobacco mosaic virus does not usually kill the plant that is infected; it does cause damage to flowers, leaves and fruit and stunts a plant’s growth, however. With tobacco mosaic damage, leaves may appear mottled with dark green and yellow-blistered areas. The virus also causes leaves to curl.
What is malaria Bitesize?
Malaria. Malaria is spread by mosquitos, which carry the Plasmodium protist. These are often found in areas with higher temperatures like Africa, Asia, and South and Central America, but not the UK because of our lower temperatures. Mosquitos suck blood containing the protists from an infected person.