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|a 10.1094/PDIS-92-8-1254C
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|a eng
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|a Gudmestad, N C
|e verfasserin
|4 aut
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|a First Report of Tobacco rattle virus Causing Corky Ringspot in Potatoes Grown in Minnesota and Wisconsin
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| 264 |
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|c 2008
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| 336 |
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 20.11.2019
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a In July 2007, potato tubers cv. Russet Burbank (RB) with necrotic arcs and spots were detected in three fields in Buffalo County, Wisconsin and one field in Benson County, Minnesota. Umatilla Russet (UR) potatoes harvested from the west half of a field in Swift County, MN had similar, but visually distinct necrotic lesions. Portions of one field in Minnesota were abandoned, and the stored potato crop from two fields in Wisconsin was rejected by processors, representing a total crop loss due to tuber necrosis. Tuber symptoms displayed in both cultivars resembled those described for corky ringspot caused by Tobacco rattle virus (TRV) (4). Total RNA was isolated from necrotic tuber tissue crushed in liquid nitrogen and extracted using the Total RNA Isolation Kit (Promega Corp., Madison, WI). These extracts were tested for the presence of TRV by reverse transcription (RT)-PCR using primers complementary to nucleotides 6555 to 6575 and identical to nucleotides 6113 to 6132 within the 3' terminal open reading frame of TRV RNA-1 (3). The expected 463-bp fragments were amplified from RB tubers. Nucleotide sequences from a Wisconsin and Minnesota isolate (GenBank Accession Nos. EU569290 and EU569291, respectively) were 99 to 100% identical to the corresponding region in a published TRV sequence (GenBank Accession No. AF055912). A 396-bp fragment was amplified from UR tubers and sequence data (GenBank Accession No. EU569292) indicated a unique 63 nucleotide sequence was substituted for a 129 nucleotide sequence spanning residues 227 to 357 of the 463-bp amplicon from the RB TRV isolates. Seven fragments were sequenced from different UR tubers and the 396-bp fragment was identical among them. The sequence outside the substituted region had 92% identity to the published TRV sequence. Amplification of the full-length TRV RNA2 using primers 179/180 located in the 5' and 3' untranslated regions (2) was successful for 28 and 0% of the RB and UR samples, respectively, suggesting that the RNA2 is not present in these strains or has undergone significant mutation. TRV-infected sap from both potato cultivars was mechanically transmitted to tobacco cv. Samsun NN and these plants subsequently tested positive for TRV by ELISA using ATCC antiserum PVAS 820. Ninety tubers exhibiting mild to severe symptoms of TRV were planted in the greenhouse. Each tuber was bisected laterally; necrotic tissue was removed from one half of the tuber and tested for the presence of TRV using RT-PCR protocols described above for RNA1. The remaining half was bisected horizontally and both sections were planted. Foliage from each emerged plant was subsequently also tested by RT-PCR for TRV RNA1. All RB tubers from Wisconsin tested positive for TRV, but only 7 of 24 emerged plants tested positive. Only 72% of the UR tubers and 4 of 25 emerged plants tested positive. TRV has been confirmed in California, Colorado, Florida, Idaho, Michigan (1), Oregon, and Washington. To our knowledge, this is the first report of corky ringspot in potato caused by TRV in Minnesota and Wisconsin. References: (1) W. W. Kirk et al. Plant Dis. 92:485, 2008. (2) S. A. MacFarlane. J. Virol. Methods. 56:91, 1996. (3) D. J. Robinson. J. Virol. Methods 40:57, 1992. (4) S. A. Slack. Tobacco rattle virus. Page 71 in: Compendium of Potato Diseases. 2nd ed. W. R. Stevenson et al., eds. The American Phytopathological Society, St. Paul, MN, 2001
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| 650 |
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|a Journal Article
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| 700 |
1 |
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|a Mallik, I
|e verfasserin
|4 aut
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| 700 |
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|a Pasche, J S
|e verfasserin
|4 aut
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| 700 |
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|a Crosslin, J M
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
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|g 92(2008), 8 vom: 11. Aug., Seite 1254
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|g pages:1254
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|u http://dx.doi.org/10.1094/PDIS-92-8-1254C
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