Abstract
IN his recent interesting article1, Dr. Darlington speculates on the origin of viruses and in particular on that of paracrinkle virus in the potato variety King Edward. He states with reference to paracrinkle that "what is a stable and presumably useful cell protein with one plant genotype acts as a destructive agent with another"; also that "any virus that can be transmitted only by grafting must therefore have arisen from grafting; that is to say, from the invasion of one plant by the proteins of another". We gather from this that Dr. Darlington considers that a protein constituent of King Edward becomes a virus on transference by grafting to another potato variety. While this is a tempting speculation, whatever evidence there is does not support it, and we should like to point out the following facts.
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Nature, 154, 164 (1944).
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CARSON, G., HOWARD, H., MARKHAM, R. et al. Paracrinkle Virus and Inheritance. Nature 154, 334 (1944). https://doi.org/10.1038/154334a0
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DOI: https://doi.org/10.1038/154334a0
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