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The concentration of alfalfa-mosaic virus in tobacco plants at different periods of time after inoculation



The concentration of alfalfa-mosaic virus in tobacco plants at different periods of time after inoculation



Phytopath 31(5): 410-420



When young tobacco plants are inoculated with alfalfa-mosaic virus, the virus content of the plant increases from about the 4th to the 12th day after inoculation, then decreases rapidly. The juice from plants diseased for 48 days or longer may be less than 1% as active as that from plants diseased for only 12 days. In the older plants, most of the virus is located in the upper leaves, which show only a faint mottling; but, even in such leaves, the conc. is much less than that reached about 12 days after inoculation. The older leaves, which once contained a high conc. of virus, contain small amounts of virus and show no symptoms. Disappearance of symptoms is associated with loss of virus in such plants.[long dash]Tobacco plants, inoculated with alfalfa-mosaic virus, may undergo a type of recovery similar to that exhibited by plants diseased with tobacco-ring-spot virus, and the 2 phenomena may differ in that the former virus is unstable in vivo.

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