The influence of tolerant tomato hosts on the pathogenic characteristics of tobacco mosaic virus

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Abstract
The susceptible tomato cultivar Craigella and three TMV-tolerant cultivars heterozygous for the genes Tm-1, Tm-2, and Tm-22 respectively, were united by grafting into a bundle of four plants such that the Craigella was in contact with the Tm-1 component, Tm-1 with Tm-2, and Tm-2 with Tm-22. The susceptible component of the graft combination was then inoculated with either strain 0 or strain 1 of tobacco mosaic virus. Subsequently, the effect of host passage was determined by assaying leaf samples from all four components of the graft and then identifying the virus as to pathogenic strain by inoculation to differential hosts. Graft combinations which had received strain 0 inoculum yielded variants which were either strain 1 or 2 or 1.2; grafts originally infected with strain 1 yielded variants which were strain 2 or 1.2. Since no new strains were detected in the susceptible Craigella component it is concluded that the changes in pathogenicity of TMV were mediated by graft passage into tolerant hosts.

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