PLPA 200 Lecture Notes - Lecture 13: Tobacco Mosaic Virus, Plant Virus, Necrosis

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First of all, you"ll be glad to hear that when you learn about plant viruses there are no scienti c names to memorize! Plant viruses are often named for the plant that they infect and a symptom or two that they induce. Tobacco mosaic virus, for example, infects tobacco plants and causes a mosaic pattern of dark and light green areas on the leaves. On the negative side, this virus also infects other plant species, sometimes causing different types of symptoms, which can be confusing. But on the positive side, there is a simple relationship between the pathogen name and the disease name for viral pathogens - just drop the word virus . Thus, the viral pathogen tobacco mosaic virus causes the disease tobacco mosaic. Viruses are the smallest pathogens that we study in plant pathology 200. While fungi and nematodes are multicellular and bacteria are single celled organisms, viruses are subcellular - smaller than a single cell.

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