Abstract
Since the first identification and full sequence of the polerovirus pepper vein yellows virus in Australia in 2016, virus surveys of crops and weeds have sporadically identified PeVYV in different hosts and locations. Genomic comparisons of 14 PeVYV-like isolates using RT-PCR products spanning the 3’ end of the RdRp region (ORF 2), the intergenic region, ORF 3a, ORF 4, and ORF 3 (1388 nt) showed that four of the PeVYV isolates might be a new variant or PeVYV-like virus. From six PeVYV-positive plants, eight PeVYV-like sequences were obtained by high-throughput sequencing, as two hosts, 5352 and 5634, contained two slightly different PeVYV-like isolates. Three of the PeVYV-like isolates were most closely related to PeVYV-6 and PeVYV-5, and two isolates were closely related to PeVYV-9 and PeVYV-2. The other three isolates shared only 69-74% nucleotide sequence identity across the whole genome with any of the other PeVYVs, despite sharing 73-98%, 87-91%, and 84-87% amino acid sequence identity in ORF 3a, ORF 3, and the RdRp (ORF 2), respectively, suggesting that this virus is a new PeVYV-like virus, which we have tentatively called PeVYV-10. This is also the first report of a PeVYV-like virus infecting garlic.
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Acknowledgements
We thank Denis Persley and Sandy Watts for isolate collection, advice and technical support.
Funding
This study was funded by the Grains Research and Development Corporation, through funding from the Australian Government Department of Agriculture, Fisheries & Forestry, as part of its Rural R&D for Profit program, along with Cotton Research and Development Corporation, Hort Innovation Australia, Wine Australia, Sugar Research Australia and Forest and Wood Products Australia. Isolate Ita-7 was identified and isolated as part of a Ph.D. project supported by ACIAR project SMCN/2009/056 'Sustainable Productivity Improvements in Allium and Solanaceous Vegetable Crops in Indonesia and Sub-Tropical Australia'. Isolate 35744 was collected and identified as part of the VG16086 Area wide management of vegetable diseases: viruses and bacteria project funded by Hort Innovation and contributions from the Australian Government with co-investment from the Queensland Department of Agriculture and Fisheries; Victorian Department of Jobs, Precincts and Regions; The Northern Territory Department of Industry, Tourism & Trade; the Western Australia Department of Primary Industries and Regional Development and the University of Tasmania.
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FF wrote the manuscript and analysed the data. FF, SN, and PC performed high-throughput sequencing. FF and SN performed the 5’ and 3’ RACE. LJ contributed, identified, and photographed seven isolates. CG, SB, and MS contributed and identified isolates. PC provided supervision and grant funding. All authors read, revised, and approved the final manuscript.
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Filardo, F., Nurulita, S., Jones, L. et al. Genomic variation in pepper vein yellows viruses in Australia, including a new putative variant, PeVYV-10. Arch Virol 169, 18 (2024). https://doi.org/10.1007/s00705-023-05943-y
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DOI: https://doi.org/10.1007/s00705-023-05943-y