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Screening of grapevine red blotch virus in two European ampelographic collections
Auteur(s)
Jean-Sébastien Reynard
Justine Brodard
Nathalie Dubuis
Isabelle Kellenberger
Anne-Sophie Spilmont
David Roquis
Varvara Maliogka
Cécile Marchal
Sandrine Dedet
Katia Gindro
Olivier Schumpp
Jean-Laurent Spring
Thierry Lacombe
Date Issued
2021
Journal
Journal of Plant Pathology
Vol.
104
No
1
From page
9
To page
15
Abstract
<jats:title>Abstract</jats:title><jats:p>Grapevine red blotch virus (GRBV) is a recently identified virus that infects grapevine and has a severe impact on the grape industry in North America. Since the first description of the virus 8 years ago, clear progress has been made regarding our understanding of the GRBV pathosystem. However, questions remain regarding the origin of this pathogen and its spread outside North America, especially in Europe. In this study, we present the results of a large-scale GRBV survey in two European repositories; we targeted <jats:italic>Vitis</jats:italic> spp. accessions with diverse geographical origins. Of 816 accessions from different origins (50 different countries around the world), six accessions were infected by GRBV, all of which originated from the United States. We investigated the DNA virome of 155 grapevine accessions from the Swiss grapevine collection using high-throughput sequencing. We observed that virome of the Swiss grapevine collection was composed of several RNA viruses. In contrast, we did not detect any DNA viruses in the 155 Swiss grapevine accessions. This finding suggests that the abundance of DNA viruses infecting grapevines in Switzerland is either very low or non-existent. Our results and the findings of studies published since 2008 show that GRBV most likely originated in North America and subsequently spread to other viticultural areas in the world via unintentional movement of infected cuttings. According to our data, the most plausible scenario for the origin of GRBV is that the virus evolved from non-<jats:italic>Vitis vinifera</jats:italic> hosts and underwent a host jump to <jats:italic>Vitis vinifera</jats:italic> after its introduction to North America in the 1600s.</jats:p>
Publication type
journal article
