Molecular analyses of viruses infecting Chinese scallion ( Allium chinense G. Don) showed that the plants did not contain any of the poty-, carla- or allexiviruses that are common in garlic plants in China. The complete sequences of a potyvirus and a potexvirus were determined and these were shown to represent different viruses from any in the databases. They could be transmitted mechanically to scallion but not to other Allium species (including garlic) or to Narcissus . The potyvirus, tentatively named Scallion mosaic virus, has a distant relationship ( c. 62% nucleotide identity over the entire genome) to Turnip mosaic virus and Japanese yam mosaic virus , with which it grouped in phylogenetic analyses. Its genome is 9324 nts long, encoding a 341.3 kDa polyprotein of 3001 amino acids. The potexvirus, tentatively named Scallion virus X, has a genome 6987 nts long and its organisation was similar to that of the other potexviruses but with only 46.3–63.2% nucleotides identical to them. It is most closely related to Narcissus mosaic virus but phylogenetic analyses indicate that it should be considered a distinct species. Neither of the viruses have been detected in garlic, although the two host plants are closely related.
Archives of Virology – Springer Journals
Published: Apr 1, 2002
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