Explain the diseases in plants caused by viruses, Help me write an answer for 4 marks.
Answers
Explanation:
Virus particles are extremely small and can be seen only with an electron microscope. Most plant viruses are either rod-shaped or isometric (polyhedral). TMV, potato virus Y (PVY), and cucumber mosaic virus (CMV) are examples of a short rigid rod-shaped, a long flexuous rod-shaped, and an isometric virus, respectively.Viruses are obligate parasites; that is, they require a living host in order to grow and multiply. Once in a wounded cell, the virus particle sheds its protein coat and the nucleic acid then directs the production of multiple copies of itself and related proteins leading to the development of new virus particles. For example, tobacco ring spot virus causes a bud blight in soybeans; maize dwarf mosaic infects sorghum, Sudan grass, sugarcane and Johnson grass in addition to corn.