Adaptation of positive-strand RNA viruses to plants
The vast majority of positive-strand RNA viruses (more than 500 species) are adapted to infection of plant hosts. Genome sequence comparisons of these plant RNA viruses have revealed that most of them are genetically related to animal cell-infecting counterparts; this led to the concept of “superfamilies”. Comparison of genetic maps of representative plant and animal viruses belonging to the same superfamily (e.g. cowpea mosaic virus [CPMV] versus picornaviruses and tobacco mosaic virus versus alphaviruses) have revealed genes in the plant viral genomes that appear to be essential adaptations needed for successful invasion and spread through their plant hosts. The best studied example represents the “movement protein” gene that is actively involved in cell-to-cell spread of plant viruses, thereby playing a key role in virulence and pathogenesis. In this paper the host adaptations of a number of plant viruses will be discussed, with special emphasis on the cell-to-cell movement mechanism of comovirus CPMV.
KeywordsMosaic Virus Tobacco Mosaic Virus Plant Virus Tobacco Etch Virus Beet Necrotic Yellow Vein Virus
Unable to display preview. Download preview PDF.
- 3.Strauss EG, Strauss JH, Levine AJ (1990) Virus evolution. In: Fields BN, Knipe DM, Chanock RM (eds) Virology. Raven Press, New York, pp 167–190Google Scholar
- 12.Goldbach R, Eggen R, De Jager C, Van Kämmen A, Van Lent J, Rezelman G, Wellink J (1990) Genetic organization, evolution and expression of plant viral genomes. In: Fräser RSS (ed) Recognition and response in plant-virus interactions. Springer, Berlin Heidelberg New York Tokyo, pp 147–162CrossRefGoogle Scholar
- 19.De Jong W, Ahlquist P (1991) Bromovirus host specifity and systemic infection. Semin Virol 2: 97–105Google Scholar