Abstract
SEVERAL plants, when infected with an appropriate virus, fail to show symptoms upon new growth made during a period of relatively high temperature. Thus leaves of tobacco infected with mosaic (tobacco virus 1 of Johnson), when grown above 98° F., show no appearance of the disease. This is known as masking, and was first described by Prof. James Johnson1 in 1921. Most workers on plant viruses realise that the appearance of symptoms is delayed at cool temperatures; but an actual masking below a temperature of about 51° F. can be demonstrated.
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References
” The Relation of Air Temperature to Certain Plant Diseases” Phytopath., 11, No. 11, 446–458 (1921).
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GRAINGER, J. Low-Temperature Masking of Tobacco Mosaic Symptoms. Nature 137, 31–32 (1936). https://doi.org/10.1038/137031b0
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DOI: https://doi.org/10.1038/137031b0
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