Abstract
Rubus yellow net virus (RYNV) is a member of the genus Badnavirus (family: Caulimoviridae). RYNV infects Rubus species causing chlorosis of the tissue along the leaf veins, giving an unevenly distributed netted symptom in some cultivars of red and black raspberry. Recently, a strain of RYNV was sequenced from a Rubus idaeus plant in Alberta, Canada, exhibiting such symptoms. The viral genome contained seven open reading frames (ORFs) with five of them in the sense-strand, including a large polyprotein. Here we describe a graft-transmissible strain of RYNV from Europe infecting cultivar ‘Baumforth’s Seedling A’ (named RYNV-BS), which was sequenced using rolling circle amplification, enzymatic digestion, cloning and primer walking, and it was resequenced at a 5X coverage. This sequence was then compared with the RYNV-Ca genome and significant differences were observed. Genomic analysis identified differences in the arrangement of coding regions, promoter elements, and presence of motifs. The genomic organization of RYNV-BS consisted of five ORFs (four ORFs in the sense-strand and one ORF in the antisense-strand). ORFs 1, 2, and 3 showed a high degree of homology to RYNV-Ca, while ORFs 4 and 6 of RYNV-BS were quite distinct. Also, the predicted ORFs 5 and 7 in the RYNV-Ca were absent in the RYNV-BS sequence. These differences may account for the lack of aphid transmissibility of RYNV-BS.
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Acknowledgments
We thank Joseph Postman from the National Clonal Germplasm Repository-USDA (Corvallis, Oregon) for providing information and plant material used during this study. Also, we thank Javier F Tabima (Oregon State University) for his advice on phylogenetic analysis. The work presented here was partially funded with Grants from the Northwest Center for Small Fruits Research, the Washington Red Raspberry Commission, the Oregon Raspberry and Blackberry Commission, and USDA-NIFA-SCRI (2009-51181-06022). Diaz-Lara did most of the work reported here, with the other authors contributed equally to the work.
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Diaz-Lara, A., Mosier, N.J., Keller, K.E. et al. A variant of Rubus yellow net virus with altered genomic organization. Virus Genes 50, 104–110 (2015). https://doi.org/10.1007/s11262-014-1149-6
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DOI: https://doi.org/10.1007/s11262-014-1149-6