Abstract
Electron microscopy of extracts from diseased Polygonum convolvulus plants from Piedmont (Italy) revealed particles with the morphological features of a tospovirus. Sequencing of the full-length small (S) and medium (M) genome segments indicated that the virus is a member of a new Tospovirus species provisionally named Polygonum ringspot virus. A feature distinguishing it from members of other Tospovirus species was the presence of a very short intergenic region on the S segment lacking the potential for formation of the predicted hairpin structure involved in subgenomic expression. Antibodies made against purified nucleocapsids allowed serological comparison with other tospovirus isolates and revealed a relationship with tomato yellow ring virus, and to a lesser extent, to iris yellow spot virus. Serological tests detected the virus in various locations in northern and central Italy. The experimental host range was wide, although in nature the virus appeared restricted to two Polygonum species.
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Particular thanks to Riccardo Lenzi and Caterina Perrone for technical assistance, to Dr. Marco Pansa for helping with field surveys and to Dr. Robert Milne for carefully editing the manuscript.
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705_2008_228_MOESM1_ESM.pdf
Fig. 1: A tomato plant remained PolRSV negative althoughcompletely surrounded by PolRSV infected Polygonum convolvolus (PDF 1387 kb)
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Table II: DAS-ELISA results for the detection of PolRSV, IYSV and TYRV in weed and vegetable crop samplesfrom 5 lcations in Piedmonta (PDF 9 kb)
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Ciuffo, M., Tavella, L., Pacifico, D. et al. A member of a new Tospovirus species isolated in Italy from wild buckwheat (Polygonum convolvulus) . Arch Virol 153, 2059–2068 (2008). https://doi.org/10.1007/s00705-008-0228-1
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DOI: https://doi.org/10.1007/s00705-008-0228-1