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The amino acid motifs KITC and PTK are not present in HC-Pro. Roymoviruses have low nucleotide and amino acid identities with other potyvirids. The nucleotide and deduced amino acid sequences of the polyprotein share greatest identities with other viruses in the family Potyviridae, but they are not clearly closer to members of any particular genera in the family. Comparison of the deduced amino acid sequence of the large ORF revealed identities with other viruses of the family to be low, ranging from 13% (some bymoviruses) to 23% (some potyviruses).
Particles are 720 to 750 nm in size.
Rose yellow mosaic virus has a genome of 9,508 nt.
The large polyprotein is probably processed in the same manner as potyviruses. PIPO is present.
Genome organization resembles that of members of the genus Potyvirus.
See discussion under family description.
Isolates of the type species, Rose yellow mosaic virus, were isolated from several rose cultivars in New York and Minnesota.
The conserved amino acid motifs KITC and PTK are not present in the HC-Pro of rose yellow mosaic virus. Instead, a putative C-2x-C eriophyid mite transmission motif is found at amino acid residues 48–51 at the N-terminus of the protein. The coat protein amino acid motif DAG found in most aphid-transmitted potyvirids is also lacking. Together this information suggests that rose yellow mosaic virus may be transmitted by eriophyid mites, although this has not been proven experimentally.
Phylogenetic analysis of the coat protein and ORF places rose yellow mosaic virus basal to viruses belonging to the genera Tritimovirus, Poeacevirus and Ipomovirus (Figure 3.Potyviridae).
Roymovirus: from rose yellow mosaic virus
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