Articles
VARIABILITY IN ALTERNANTHERA MOSAIC VIRUS ISOLATES FROM DIFFERENT HOSTS
Article number
1072_4
Pages
47 – 53
Language
English
Abstract
We have determined the complete genome sequences of Alternanthera mosaic virus phlox isolate PA (AltMV-PA) and four infectious clone variants derived from AltMV-SP, as well as partial sequences of other isolates from various types of phlox, from portulaca, nandina, and cineraria.
Phylogenetic comparison of the amino acid sequences of the various gene products of these AltMV isolates and other AltMV sequences from GenBank reveals that there are two main groups of AltMV isolates. phlox-type isolates are differentiated from portulaca-type isolates, and both are clearly distinguished from both the serologically-related Papaya mosaic virus (PapMV) and from Potato virus X (PVX). A US isolate from nandina is phlox-type, whereas isolates from hybrid annual phlox and from cineraria are portulaca-type. Partial RdRp sequences are available for several other isolates.
Within this partial RdRp region a New Zealand isolate from nandina is identical to AltMV-PA, whereas Brazilian isolates from torenia, and a portulaca-type Florida isolate share several variant residues, one of which is also present in a Russian portulaca isolate.
Many other residues differ between AltMV and both PapMV and PVX. These comparisons suggest that portulaca may have been the source of infection of AltMV for most ornamentals other than perennial phlox species and nandina.
Phylogenetic comparison of the amino acid sequences of the various gene products of these AltMV isolates and other AltMV sequences from GenBank reveals that there are two main groups of AltMV isolates. phlox-type isolates are differentiated from portulaca-type isolates, and both are clearly distinguished from both the serologically-related Papaya mosaic virus (PapMV) and from Potato virus X (PVX). A US isolate from nandina is phlox-type, whereas isolates from hybrid annual phlox and from cineraria are portulaca-type. Partial RdRp sequences are available for several other isolates.
Within this partial RdRp region a New Zealand isolate from nandina is identical to AltMV-PA, whereas Brazilian isolates from torenia, and a portulaca-type Florida isolate share several variant residues, one of which is also present in a Russian portulaca isolate.
Many other residues differ between AltMV and both PapMV and PVX. These comparisons suggest that portulaca may have been the source of infection of AltMV for most ornamentals other than perennial phlox species and nandina.
Authors
J. Hammond, M.D. Reinsel
Keywords
Alternanthera mosaic virus, phlox, portulaca, Potexvirus, variability
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