Tuberose plants with mild mottle symptoms, growing in a glasshouse in Hangzhou, China, contained virions and inclusion bodies typical of a potyvirus. The virus was mechanically transmitted to tuberose but not to 14 other test plant species. A fragment of 4607 nucleotides, corresponding to the 3′-half of a typical potyvirus was amplified by RT-PCR using degenerate primers and sequenced. The most similar sequence in the databases was that of Tuberose mild mosaic virus (TuMMV) from Taiwan and this was the only virus significantly related to it in phylogenetic analyses. The new sequence had 71.1% nt and 76.6% aa identity to TuMMV in the coat protein. Western blot analyses using antisera raised to expressed coat protein showed that the two viruses were serologically related. Although there are no substantial biological data to distinguish the Hangzhou isolate from TuMMV, the molecular difference between the two virus isolates is similar to, or slightly greater than, that between several pairs of well-established potyvirus species. These results therefore suggest that the Hangzhou isolate should be regarded as a new member of the genus Potyvirus , and we have tentatively named it Tuberose mild mottle virus.
Archives of Virology – Springer Journals
Published: Jun 1, 2004
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