Grapevine red blotch-associated virus Is Widespread in the United States

Grapevine red blotch disease has been recognized since 2008 as affecting North American grape production. The presence of the newly described Grapevine red blotch-associated virus (GRBaV) is highly correlated with the disease. To more effectively detect and monitor the presence of the virus, a sampl...

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Bibliographic Details
Published in:Phytopathology 2014-11, Vol.104 (11), p.1232-1240
Main Authors: Krenz, B, Thompson, J R, McLane, H L, Fuchs, M, Perry, K L
Format: Article
Language:English
Subjects:
Base Sequence
Circoviridae
Geminiviridae
Geminiviridae - classification
Geminiviridae - genetics
Geminiviridae - isolation & purification
Molecular Sequence Data
North America
Phylogeny
Plant Diseases - virology
Recombination, Genetic
Sequence Analysis, DNA
United States
Virus Replication
Vitaceae
Vitis - virology
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Summary:Grapevine red blotch disease has been recognized since 2008 as affecting North American grape production. The presence of the newly described Grapevine red blotch-associated virus (GRBaV) is highly correlated with the disease. To more effectively detect and monitor the presence of the virus, a sample processing strategy and multiplex polymerase chain reaction assay were developed. A total of 42 of 113 vine samples collected in or received from seven of the United States were shown to harbor the virus, demonstrating the virus is widely distributed across North America. Phylogenetic analyses of a viral replication-associated protein (Rep) gene fragment from the 42 isolates of GRBaV demonstrated distinct clades of the virus (1 and 2), with clade 1 showing the greatest variability. The full-length genome of six virus isolates was sequenced, and phylogenetic analyses of 14 whole genomes recapitulated results seen for the Rep gene. A comparison of GRBaV genomes revealed evidence of recombination underlying some of the variation seen among GRBaV genomes within clade 1. Phylogenetic analyses of coat and replicase-associated protein sequences among single-stranded DNA viruses showed GRBaV to group within the family Geminiviridae. This grouping is distinct from members of the families Nanoviridae and Circoviridae, with limited significant affinities to both recognized genera and novel plant-infecting, gemini-like viruses.
ISSN:0031-949X
1943-7684
DOI:10.1094/PHYTO-02-14-0053-R