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Interference between Two Satellite Viruses of Tobacco Necrosis Virus

Rothamsted Experimental Station, Harpenden, Herts, England

The tobacco necrosis satellite viruses SV₁ and SV₂ interfere with one another's replication, and the larger the dose of the interfering satellite the greater the degree of interference produced. The amount of interference also depends on the strain of tobacco necrosis virus (TNV) used as helper. Suppression of SV₂ by SV₁ is greater than that of SV₁ by SV₂, although SV₂ is the more infective. SV_c differs serologically from SV₁ and SV₂ no more than these two differ from each other, but it needs a different strain of TNV for replication. Nevertheless, there is no interference between SV_c and either SV₁ or SV₂. The interference between SV₁ and SV₂ takes place in the first 2 h after inoculation. Satellite viruses inoculated 3 days after TNV do not interfere with one another provided the TNV strain is one that aids their multiplication. The results suggest that SV₁ and SV₂ compete for an early metabolite.

Received 19 May 1972; accepted 12 July 1972.