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Scottish Horticultural Research Institute Invergowrie, Dundee Scotland
Disc electrophoresis of the soluble proteins in leaf extracts failed to reveal any change induced by infection with raspberry ringspot virus either in inoculated or in systemically infected symptom-bearing or recovered leaves of Nicotiana benthamiana. Evidence is given that three of the four proteins previously thought to occur only in virus-infected or polyacrylic acid-injected Nicotiana tabacum leaves are probably normal constituents. Environmental conditions were critical for the change in protein pattern induced by alfalfa mosaic virus in tobacco leaves.
Received 30 December 1974;
accepted 12 March 1975.
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