Abstract
The genomic regions encoding the putative movement protein (MP), coat protein (CP) and intergenic region (IGR) of seven Spanish isolates of the Parietaria mottle virus which infects tomato plants (PMoV-T) were sequenced. Values for the genetic diversity of the PMoV-T isolates were 0.056, 0.047 and 0.013 for the CP, MP genes and IGR, respectively. Nucleotide and amino acid sequence comparison of the seven PMoV-T isolates with those of PMoV revealed significant differences. All of them had a cytosine deletion at position 1366, also confirmed in an Italian tomato isolate, which involves a start codon for the CP gene different from that for the PMoV sequence, resulting in a CP 16 amino acids shorter than the PMoV CP. The certainty of a cytosine deletion only associated to the tomato isolates or the possibility of a mistake in the PMoV published sequence are the two hypotheses that could explain this difference. Structural motifs highly conserved in Ilarviruses were identified in PMoV-T MP and CP. A stable hairpin structure is proposed for IGR, by the initiation site for subgenomic RNA 4 synthesis. Phylogenetic analysis of CP and MP amino acid sequences showed that Spanish PMoV-T isolates form a separate group from PMoV and other members of the Ilarvirus genus. Comparative analysis with different PMoV isolates including tomato isolates from other regions and isolates from different hosts are necessary to confirm this differentiation.
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Acknowledgements
We are grateful to Dr. L. Rubio for critical reading of the manuscript and A. Barba for technical assistance. This work was supported by the project RTA02-071 from the Instituto Nacional de Investigaciones y Tecnología Agraria y Alimentaria and by Project 20060622 from the Generalitat Valenciana.
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Galipienso, L., del Carmen Herranz, M., López, C. et al. Sequence analysis within the RNA 3 of seven Spanish tomato isolates of Parietaria mottle virus (PMoV-T) reveals important structural differences with the parietaria isolates (PMoV). Eur J Plant Pathol 120, 125–135 (2008). https://doi.org/10.1007/s10658-007-9200-2
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DOI: https://doi.org/10.1007/s10658-007-9200-2