抄録
In order to know the mechanism controling the host specificity of tobacco mosaic virus (TMV), three species of plants showing various degrees of resistance to TMV or TMV-RNA infection were selected and the fate of infecting viral genome was studied. Extract was obtained from leaves 0.5-6hr after inoculation of 32P-TMV or 32P-TMV-RNA and analyzed by sucrose density gradient centrifugation. It was found that polysomes containing infecting 32P-RNA were formed in plants resistant to TMV to the same extent as in susceptible tobacco plants, suggesting that the host specificity of TMV is determined at a stage of viral multiplication later than the step of translation of infecting viral genome.
