Genetic Diversity of Cryphonectria hypovirus 1 in China, Japan and Italy

Liu, F.-X.; Ding, Ping; Xu, Changfeng; Wang, K.-R.

doi:10.1111/j.1439-0434.2007.01292.x

Cited by 10 publications

(9 citation statements)

References 37 publications

(54 reference statements)

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“…These results are in agreement with a genetic analysis of ORF A with CHV1 strains, showing that Italian strains might have originated in Japan (Liu et al. ). All these data suggest that the viral A3‐B3 lineage followed its host lineage G1 from Japan to Europe.…”

Section: Discussionsupporting

confidence: 92%

Multiple introductions and recombination in Cryphonectria hypovirus 1: perspective for a sustainable biological control of chestnut blight

Feau

Dutech

Brusini

et al. 2014

Evolutionary Applications

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Cryphonectria hypovirus 1 (CHV1) is a mycovirus which decreases the virulence of its fungal host Cryphonectria parasitica, the causal agent of chestnut blight recently introduced in Europe. The understanding of the evolutionary processes which have shaped CHV1 populations in Europe is required to develop a sustainable biocontrol strategy targeting chestnut blight and effective in European chestnut forests. To retrace the evolutionary history of CHV1, we analyzed sequences from two genomic regions on a collection of 55 CHV1 strains from France and northern Spain, two countries where multiple introductions of C. parasitica occurred. Several recombination events and variable selection pressures contributed to CHV1 evolution, agreeing with a non-clock-like diversification rate. These two mechanisms may be at the origin of CHV1 population diversity observed in western Europe. Considering the actual prevalence of CHV1 and its association with host genotypes, multiple introductions of CHV1 may have occurred in Europe, some of them directly from Asia and some of them through North America. Although some viral strains remained with low frequency in their introduction area, multiple infections might have allowed homologous recombination within parental sequences. Some of these recombinant lineages are associated with the spread of CHV1 in European regions.

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Section: Discussionsupporting

confidence: 92%

Multiple introductions and recombination in Cryphonectria hypovirus 1: perspective for a sustainable biological control of chestnut blight

Feau

Dutech

Brusini

et al. 2014

Evolutionary Applications

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“…Previous analyses (Liu et al. ) of Asian and European CHV‐1 discovered that the genetic diversity among Asian isolates was higher than among European isolates, indicating that the European CHV‐1 populations had emerged more recently. The four European subtypes of CHV‐1 (I, F1, F2, and D) were more closely related to each other than to any of the Asian isolates.…”

Section: Discussionmentioning

confidence: 97%

“…Since CHV‐1 has been found in China and Japan, it has been assumed that CHV‐1 was introduced together with C. parasitica from Asia (Liu et al. ). Records of first detection of hypovirulent C. parasitica in different regions indicated that CHV‐1 spread throughout Europe following the spread of the fungus with a lag in time (Heiniger and Rigling ; Robin and Heiniger ).…”

Section: Introductionmentioning

confidence: 99%

Invasion history and demographic pattern of Cryphonectria hypovirus 1 across European populations of the chestnut blight fungus

Bryner

Rigling

Brunner

2012

Ecology and Evolution

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We reconstructed the invasion history of the fungal virus Cryphonectria hypovirus 1 (CHV-1) in Europe, which infects the chestnut blight fungus Cryphonectria parasitica. The pattern of virus evolution was inferred based on nucleotide sequence variation from isolates sampled across a wide area in Europe at different points in time. Phylogeny and time estimates suggested that CHV-1 was introduced together with its fungal host to Europe and that it rapidly colonized the central range along the south facing slopes of the Alps and the north-east facing slopes of the Dinaric Alps. These central populations were the source for two waves of simultaneous invasions toward the southern Balkans and Turkey, as indicated by migration rates. Our results showed that the evolutionary scenarios for CHV-1 and C. parasitica were spatially congruent. As infection with CHV-1 reduces the pathogenicity of C. parasitica toward the chestnut tree, CHV-1 invasions of the newly established C. parasitica populations probably prevented the development of devastating chestnut blight epidemics in Europe. We propose that in this, and supposedly in other pathosystems, geographic, vegetation-related, demographic, economic, and political factors may help explain the correlated invasion pattern of a parasite and its host.

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“…dsRNA profiles can be quite diverse even within isolates of the same fungus. In some cases they show geographical structuring (Liu et al ., 2007a,b; Park et al ., 2006a,b; Voth et al ., 2006) but often they do not (Howitt et al ., 1995; Rong et al ., 2001; Tsai et al ., 2004). Tsai et al .…”

Section: Diversity and Incidence Of Mycovirusesmentioning

confidence: 99%

Mycoviruses of filamentous fungi and their relevance to plant pathology

Pearson

Beever

Boine

et al. 2009

Molecular Plant Pathology

435

342

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Mycoviruses (fungal viruses) are reviewed with emphasis on plant pathogenic fungi. Based on the presence of virus-like particles and unencapsidated dsRNAs, mycoviruses are common in all major fungal groups. Over 80 mycovirus species have been officially recognized from ten virus families, but a paucity of nucleic acid sequence data makes assignment of many reported mycoviruses difficult. Although most of the particle types recognized to date are isometric, a variety of morphologies have been found and, additionally, many apparently unencapsidated dsRNAs have been reported. Until recently, most characterized mycoviruses have dsRNA genomes, but ssRNA mycoviruses now constitute about one-third of the total. Two hypotheses for the origin of mycoviruses of plant pathogens are discussed: the first that they are of unknown but ancient origin and have coevolved along with their hosts, the second that they have relatively recently moved from a fungal plant host into the fungus. Although mycoviruses are typically readily transmitted through asexual spores, transmission through sexual spores varies with the host fungus. Evidence for natural horizontal transmission has been found. Typically, mycoviruses are apparently symptomless (cryptic) but beneficial effects on the host fungus have been reported. Of more practical interest to plant pathologists are those viruses that confer a hypovirulent phenotype, and the scope for using such viruses as biocontrol agents is reviewed. New tools are being developed based on host genome studies that will help to address the intellectual challenge of understanding the fungal-virus interactions and the practical challenge of manipulating this relationship to develop novel biocontrol agents for important plant pathogens.

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Genetic Diversity of Cryphonectria hypovirus 1 in China, Japan and Italy

Cited by 10 publications

References 37 publications

Multiple introductions and recombination in Cryphonectria hypovirus 1: perspective for a sustainable biological control of chestnut blight

Multiple introductions and recombination in Cryphonectria hypovirus 1: perspective for a sustainable biological control of chestnut blight

Invasion history and demographic pattern of Cryphonectria hypovirus 1 across European populations of the chestnut blight fungus

Mycoviruses of filamentous fungi and their relevance to plant pathology

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