BIOL 1050 Chapter Notes - Chapter 19: Tobacco Mosaic Virus, Martinus Beijerinck, Wendell Meredith Stanley
2 May 2019
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Colony collapse & bee decline (sept. 26, 2018) A virus consists of a nucleic acid surrounded by a protein coat. Tobacco mosaic disease-stunts the growth of tobacco plants and gives their leaves a mottled, or mosaic colouration. 1883-adolf mayer-german scientist discovered that he could transmit the disease from plant to plant by rubbing sap extracted from the disease onto healthy plants. After an unsuccessful search for an infectious microbe in the sap, mayer suggested that the small bacteria were invisible under a microscope. This was later tested a decade later by dimitri ivanowsky (russian biologist) He passed sap from infected tobacco leaves through a lter designed to remove bacteria. After ltration, the sap still produced mosaic disease. ***ivanowsky still believed that bacteria caused tobacco mosaic disease-perhaps the bacteria were small enough to pass through the lter or made a toxin that could do so.
