Summary
We have found that Arahidopsis thaliana is susceptible to infection with a crucifer strain of tobacco mosaic virus (TMV-Cg); the coat protein of TMV-Cg accumulated to a high level in uninoculated rosette leaves several days after inoculation. As a first step in the search for host-coded factors that are involved in virus multiplication, we isolated mutants of A. thaliana in which the accumulation of TMV-Cg coat protein was reduced to low levels. Of 6000 M2 plants descended from ethyl methanesulfonate-treated seeds, two such lines (PD 114 and PD378) were isolated. Genetic analyses suggested that the PD 114 phenotype was caused by a single nuclear recessive mutation, and that PD114 and PD378 belonged to the same complementation group. The coat protein accumulation of a tomato strain of TMV (TMVL) was also reduced in PD 114 plants compared to that in the wild-type plants. In contrast, PD114 plants infected with turnip crinkle or turnip yellow mosaic viruses, which belong to taxonomic groups other than Tobamovirus, expressed similar levels of these coat proteins as did infected wild-type plants.
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In this paper, we use the term “multiplication (of a virus in a plant)” to mean a substantial increase in virus concentration in the uninoculated leaves of the infected plant. Therefore, the efficiency of each process of invasion of the plant by the virus, uncoating, replication and degradation of the virus genome, formation and degradation of the virus particles, and spreading of the virus in the plant will affect the degree of multiplication
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Ishikawa, M., Obata, F., Kumagai, T. et al. Isolation of mutants of Arabidopsis thaliana in which accumulation of tobacco mosaic virus coat protein is reduced to low levels. Molec. Gen. Genet. 230, 33–38 (1991). https://doi.org/10.1007/BF00290647
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DOI: https://doi.org/10.1007/BF00290647