How does tobacco mosaic disease affect plant growth?
It infects the chloroplasts of plant leaves and changes their colour from green to yellow or white in a mosaic pattern. It can also make leaves crinkled or curled up. This reduces the plant’s ability to photosynthesise and grow properly, which can reduce farmers’ crop yields .
How can plant growth be affected by TMV?
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 a plant get tobacco mosaic virus?
The most important way that TMV can be spread from plant to plant is on workers’ hands, clothing or on tools. This is called ‘mechanical’ transmission. When plants are handled, the tiny leaf hairs and some of the outer cells inevitably are damaged slightly and leak sap onto tools, hands, and clothing.
Why have plants with TMV have stunted growth?
Explain why plants with TMV have stunted growth. Chlorophyll gives plants coloration so a discolored plant would have a lack of chlorophyll. This means that less photosynthesis would occur in the leaves of the plant, so less glucose is made as a result.
Why do plants infected with TMV have stunted growth and Discoloured leaves?
(d) TMV can cause plants to produce less chlorophyll. This causes leaf discoloration.
Why does a plant have stunted growth?
Stunting may be caused by viral, bacterial, fungal, or nematode (eelworm) infections and by noninfectious (abiotic) means including an excess or lack of water, imbalance of soil nutrients, excess light, chemical or mechanical injuries, insect or mite feeding, and too-deep planting.
Why is tobacco mosaic virus important?
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.
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.