Mycoviruses in Monilinia fructicola

Tsai, Pi-Fang; Pearson, M. N.; Beever, Ross E.

doi:10.1017/s0953756204000656

Cited by 15 publications

(17 citation statements)

References 24 publications

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“…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 . (2004) studied the distribution of dsRNA profiles in Monilinia fructicola from a single nectarine orchard in Auckland, New Zealand.…”

Section: Diversity and Incidence Of Mycovirusesmentioning

confidence: 99%

“…10% incidence of dsRNA viruses in 668 Aspergillus isolates (Van Diepeningen et al ., 2006) and the 72% incidence for Botrytis cinerea (Howitt et al ., 1995) support this hypothesis, other results do not. In Monilinia fructicola , a fungus in which the sexual stage is commonly produced, Tsai et al . (2004) detected dsRNAs in 74% of isolates.…”

Section: Virus Transmissionmentioning

confidence: 99%

“…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 (2004) studied the distribution of dsRNA profiles in Monilinia fructicola from a single nectarine orchard in Auckland, New Zealand. They found a high diversity in dsRNA profiles between isolates from different blocks of trees, different trees within a block, and even between fruit from the same tree.…”

Section: Host Range and Incidencementioning

confidence: 99%

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Mycoviruses of filamentous fungi and their relevance to plant pathology

Pearson

Beever

Boine

et al. 2009

Molecular Plant Pathology

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445

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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Section: Diversity and Incidence Of Mycovirusesmentioning

confidence: 99%

Section: Virus Transmissionmentioning

confidence: 99%

Section: Host Range and Incidencementioning

confidence: 99%

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Mycoviruses of filamentous fungi and their relevance to plant pathology

Pearson

Beever

Boine

et al. 2009

Molecular Plant Pathology

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445

342

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“…Fungal dsRNA was purified with the STE buffer (100 mM NaCl, 50 mM Tris-HCl pH 6.8, 1 mM EDTA) and collected by passing through a CF-11 column packed with 1 g cellulose powder (Whatman Ltd.) as described by Tsai et al (2004). Genomic DNA was isolated as previously described (Lee and Bostock 2006a).…”

Section: Molecular Analysismentioning

confidence: 99%

Characterization of three Colletotrichum acutatum isolates from Capsicum spp.

Liao

Chen

et al. 2012

Eur J Plant Pathol

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Colletotrichum acutatum causes anthracnose on peppers (Capsicum spp.), resulting in severe yield losses in Taiwan. Fungal isolates Coll-153, Coll- 365 and Coll-524 collected from diseased peppers were found to differ in pathogenicity. Pathogenicity assays on various index plants revealed that Coll-524 was highly virulent and Coll-153 was moderately virulent to three commercially available pepper cultivars. Both isolates induced anthracnose lesions and produced abundant conidia. Coll-365 was only weakly virulent on pepper fruit, where it caused small lesions and hardly produced conidia on pepper fruit. However, Coll-365 was highly pathogenic to tomato fruit and mango leaves, where it caused anthracnose lesions and formed acervuli and conidia. All three isolates showed similar abilities in the attachment and germination of conidia, formation of highly branched hyphae and appressoria, penetration of cuticles, and infection of epidermal cells on chili peppers. Coll-365 accumulated less turgor pressure in appressoria but produced higher levels of cutinase and protease activity than Coll-153 and Coll-524 did. All three isolates invaded the neighbouring cells through plasmodesmata in chili peppers and showed similar pectinase or cellulase activities in culture. However, the most virulent strain Coll-524 expressed stronger laccase activity and was more resistant to capsaicin compared to Coll-153 and Coll-365. The three isolates are different in numbers and sizes of double-stranded RNAs. Depending on the cultivar genotypes, cellular resistance of chili pepper to C. acutatum might rely on the ability to restrict penetration, colonization, or conidiation of the pathogen. We conclude that the differences in pathogenicity among the three C. acutatum isolates of pepper are attributed to their ability to colonize the host plant

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“…Because of char-acteristics like their persistence in infected hosts or the efficient transmission of mycoviruses to spores, the polymorphic dsRNA profiles detected in fungi have been proposed as markers for distinguishing isolates of different origins within a species (15,21,48). These dsRNA profiles have been associated with a geographical structure in some fungal species (31,54), but often this is not the case (42,49).…”

mentioning

confidence: 99%

Prevalence and Diversity of Viruses in the Entomopathogenic Fungus Beauveria bassiana

Herrero

Dueñas

Quesada‐Moraga

et al. 2012

Appl Environ Microbiol

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bViruses have been discovered in numerous fungal species, but unlike most known animal or plant viruses, they are rarely associated with deleterious effects on their hosts. The knowledge about viruses among entomopathogenic fungi is very limited, although their existence is suspected because of the presence of virus-like double-stranded RNA (dsRNA) in isolates of several species. Beauveria bassiana is one of the most-studied species of entomopathogenic fungi; it has a cosmopolitan distribution and is used as a biological control agent against invertebrates in agriculture. We analyzed a collection of 73 isolates obtained at different locations and from different habitats in Spain and Portugal, searching for dsRNA elements indicative of viral infections. The results revealed that the prevalence of viral infections is high; 54.8% of the isolates contained dsRNA elements with viral characteristics. The dsRNA electropherotypes of infected isolates indicated that virus diversity was high in the collection analyzed and that mixed virus infections occurred in fungal isolates. However, a hybridization experiment indicated that dsRNA bands that are similar in size do not always have similar sequences. Particular virus species or dsRNA profiles were not associated with locations or types of habitats, probably because of the ubiquity and efficient dispersion of this fungus as an airborne species. The sequence of one of the most common dsRNA elements corresponded to the 5.2-kbp genome of a previously undescribed member of the Totiviridae family, termed B. bassiana RNA virus 1 (BbRV1).

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Mycoviruses in Monilinia fructicola

Cited by 15 publications

References 24 publications

Mycoviruses of filamentous fungi and their relevance to plant pathology

Mycoviruses of filamentous fungi and their relevance to plant pathology

Characterization of three Colletotrichum acutatum isolates from Capsicum spp.

Prevalence and Diversity of Viruses in the Entomopathogenic Fungus Beauveria bassiana

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