Summary
In the Mt. Kosciusko alpine area of Australia there are three well-separated populations ofCardamine lilacina, an endemic sward-forming perennial brassica, and these are infected with turnip yellow mosaic tymovirus. The genetic variation in these viral populations has been assessed by an RNA hybrid mismatch polymorphism method. About 100 isolates were examined; the genomic RNA of each isolate was prepared from a shoot of a single wildC. lilacina plant. RNA hybrid mismatch polymorphisms (RHMPs) were assessed in six regions of the genomes using labelled negative-strand probes transcribed from selected portions of a cloned TYMV genome. The probed region at the 3′ end of the genome showed little variation and over 95% of the isolates gave the same pattern. However, other parts of the genome, including the 5′ non-coding region, were much more variable. There was no significant correlation between groupings based on the RHMP patterns, and the location from which the isolates were collected, nor with the symptom type or severity shown by their host plants. The patterns of variation suggested that all three populations of the virus are a single quasi-species; at most one tenth of the isolates gave similar RHMP patterns, those of the “master copy”.
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Skotnicki, M.L., Mackenzie, A.M., Ding, S.W. et al. RNA hybrid mismatch polymorphisms in Australian populations of turnip yellow mosaic tymovirus. Archives of Virology 132, 83–99 (1993). https://doi.org/10.1007/BF01309845
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DOI: https://doi.org/10.1007/BF01309845