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Shamsi W, Mittelstrass J, Ulrich S, Kondo H, Rigling D, Prospero S. Possible Biological Control of Ash Dieback Using the Mycoparasite Hymenoscyphus Fraxineus Mitovirus 2. PHYTOPATHOLOGY 2024; 114:1020-1027. [PMID: 38114080 DOI: 10.1094/phyto-09-23-0346-kc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Invasive fungal diseases represent a major threat to forest ecosystems worldwide. As the application of fungicides is often unfeasible and not a sustainable solution, only a few other control options are available, including biological control. In this context, the use of parasitic mycoviruses as biocontrol agents of fungal pathogens has recently gained particular attention. Since the 1990s, the Asian fungus Hymenoscyphus fraxineus has been causing lethal ash dieback across Europe. In the present study, we investigated the biocontrol potential of the mitovirus Hymenoscyphus fraxineus mitovirus 2 (HfMV2) previously identified in Japanese populations of the pathogen. HfMV2 could be successfully introduced via co-culturing into 16 of 105 HfMV2-free isolates. Infection with HfMV2 had contrasting effects on fungal growth in vitro, from cryptic to detrimental or beneficial. Virus-infected H. fraxineus isolates whose growth was reduced by HfMV2 showed overall a lower virulence on ash (Fraxinus excelsior) saplings as compared with their isogenic HfMV2-free lines. The results suggest that mycoviruses exist in the native populations of H. fraxineus in Asia that have the potential for biological control of ash dieback in Europe. [Formula: see text] Copyright © 2024 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Wajeeha Shamsi
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland
| | - Jana Mittelstrass
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland
| | - Sven Ulrich
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland
| | - Hideki Kondo
- Institute of Plant Science and Resources, Okayama University, Kurashiki, 710-0046, Japan
| | - Daniel Rigling
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland
| | - Simone Prospero
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, 8903 Birmensdorf, Switzerland
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Jacquat AG, Ulla SB, Debat HJ, Muñoz-Adalia EJ, Theumer MG, Pedrajas MDG, Dambolena JS. An in silico analysis revealed a novel evolutionary lineage of putative mitoviruses. Environ Microbiol 2022; 24:6463-6475. [PMID: 36085554 DOI: 10.1111/1462-2920.16202] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 09/07/2022] [Indexed: 01/12/2023]
Abstract
Mitoviruses (family Mitoviridae) are small capsid-less RNA viruses that replicate in the mitochondria of fungi and plants. However, to date, the only authentic animal mitovirus infecting an insect was identified as Lutzomyia longipalpis mitovirus 1 (LulMV1). Public databases of transcriptomic studies from several animals may be a good source for identifying the often missed mitoviruses. Consequently, a search of mitovirus-like transcripts at the NCBI transcriptome shotgun assembly (TSA) library, and a search for the mitoviruses previously recorded at the NCBI non-redundant (nr) protein sequences library, were performed in order to identify new mitovirus-like sequences associated with animals. In total, 10 new putative mitoviruses were identified in the TSA database and 8 putative mitoviruses in the nr protein database. To our knowledge, these results represent the first evidence of putative mitoviruses associated with poriferan, cnidarians, echinoderms, crustaceans, myriapods and arachnids. According to different phylogenetic inferences using the maximum likelihood method, these 18 putative mitoviruses form a robust monophyletic lineage with LulMV1, the only known animal-infecting mitovirus. These findings based on in silico procedures provide strong evidence for the existence of a clade of putative mitoviruses associated with animals, which has been provisionally named 'kvinmitovirus'.
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Affiliation(s)
- Andrés Gustavo Jacquat
- Universidad Nacional de Córdoba (UNC), Facultad de Ciencias Exactas Físicas y Naturales (FCEFyN), Córdoba, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto Multidisciplinario de Biología Vegetal, IMBIV, Córdoba, Argentina
| | - Sofía Belén Ulla
- Universidad Nacional de Córdoba (UNC), Facultad de Ciencias Exactas Físicas y Naturales (FCEFyN), Córdoba, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto Multidisciplinario de Biología Vegetal, IMBIV, Córdoba, Argentina
| | - Humberto Julio Debat
- Instituto Nacional de Tecnología Agropecuaria (INTA), Centro de Investigaciones Agropecuarias (CIAP), Instituto de Patología Vegetal (IPAVE), Córdoba, Argentina
| | - Emigdio Jordán Muñoz-Adalia
- Forest Sciences Center of Catalonia, CTFC, Solsona, Spain.,Department of Crop and Forest Science, University of Lleida, Lleida, Spain
| | - Martín Gustavo Theumer
- Departamento de Bioquímica Clínica, Universidad Nacional de Córdoba (UNC), Facultad de Ciencias Químicas (FCQ), Córdoba, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), Córdoba, Argentina
| | - María Dolores García Pedrajas
- Universidad de Málaga - Consejo Superior de Investigaciones Científicas (UMA-CSIC), Instituto de Hortofruticultura Subtropical y Mediterránea (IHSM), "La Mayora", Algarrobo-Costa (Málaga), Spain
| | - José Sebastián Dambolena
- Universidad Nacional de Córdoba (UNC), Facultad de Ciencias Exactas Físicas y Naturales (FCEFyN), Córdoba, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto Multidisciplinario de Biología Vegetal, IMBIV, Córdoba, Argentina
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Shamsi W, Kondo H, Ulrich S, Rigling D, Prospero S. Novel RNA viruses from the native range of Hymenoscyphus fraxineus, the causal fungal agent of ash dieback. Virus Res 2022; 320:198901. [PMID: 36058013 DOI: 10.1016/j.virusres.2022.198901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 08/22/2022] [Accepted: 08/24/2022] [Indexed: 11/16/2022]
Abstract
The native Japanese population of the fungus Hymenoscyphus fraxineus, the causal agent of ash dieback in Europe, was screened for viruses using a high-throughput sequencing method. Five RNA viruses were detected in 116 fungal isolates sequenced via Illumina RNA-seq platform, with an overall virus prevalence of 11.2%. The viruses were completely sequenced by RNA ligase mediated rapid amplification of cDNA ends (RLM-RACE) followed by Sanger sequencing. The sequences appear to represent new species from three established families (Mito-, Endorna- and Partitiviridae), one recognized genus (Botybirnavirus) and a negative-sense single-stranded RNA virus in the order Bunyavirales from the proposed family "Mybuviridae". The highest prevalence was found for the mitovirus (7.8%), that had two genomic forms (linear and circular), while the other viruses were detected each in one isolate. Co-infection of a mitovirus and an endornavirus was also observed in one of the infected isolates. Here we describe the molecular characterization of the identified viruses. This study expands the diversity of viruses in H. fraxineus and provides the basis for investigating the virus-mediated control of ash dieback in Europe.
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Affiliation(s)
- Wajeeha Shamsi
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, Birmensdorf 8903, Switzerland.
| | - Hideki Kondo
- Institute of Plant Science and Resources, Okayama University, Kurashiki 710-0046, Japan
| | - Sven Ulrich
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, Birmensdorf 8903, Switzerland
| | - Daniel Rigling
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, Birmensdorf 8903, Switzerland
| | - Simone Prospero
- Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, Birmensdorf 8903, Switzerland
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Abstract
RNA viruses usually have linear genomes and are encapsidated by their own capsids. Here, we newly identified four mycoviruses and two previously reported mycoviruses (a fungal reovirus and a botybirnavirus) in the hypovirulent strain SCH941 of Sclerotinia sclerotiorum. One of the newly discovered mycoviruses, Sclerotinia sclerotiorum yadokarivirus 1 (SsYkV1), with a nonsegmented positive-sense single-stranded RNA (+ssRNA) genome, was molecularly characterized. SsYkV1 is 5,256 nucleotides (nt) in length, excluding the poly(A) structure, and has a large open reading frame that putatively encodes a polyprotein with the RNA-dependent RNA polymerase (RdRp) domain and a 2A-like motif. SsYkV1 was phylogenetically positioned into the family Yadokariviridae and was most closely related to Rosellinia necatrix yadokarivirus 2 (RnYkV2), with 40.55% identity (78% coverage). Although SsYkV1 does not encode its own capsid protein, the RNA and RdRp of SsYkV1 are trans-encapsidated in virions of Sclerotinia sclerotiorum botybirnavirus 3 (SsBV3), a bisegmented double-stranded RNA (dsRNA) mycovirus within the genus Botybirnavirus. In this way, SsYkV1 likely replicates inside the heterocapsid comprised of the SsBV3 capsid protein, like a dsRNA virus. SsYkV1 has a limited impact on the biological features of S. sclerotiorum. This study represents an example of a yadokarivirus trans-encapsidated by an unrelated dsRNA virus, which greatly deepens our knowledge and understanding of the unique life cycles of RNA viruses. IMPORTANCE RNA viruses typically encase their linear genomes in their own capsids. However, a capsidless +ssRNA virus (RnYkV1) highjacks the capsid of a nonsegmented dsRNA virus for the trans-encapsidation of its own RNA and RdRp. RnYkV1 belongs to the family Yadokariviridae, which already contains more than a dozen mycoviruses. However, it is unknown whether other yadokariviruses except RnYkV1 are also hosted by a heterocapsid, although dsRNA viruses with capsid proteins were detected in fungi harboring yadokarivirus. It is noteworthy that almost all presumed partner dsRNA viruses of yadokariviruses belong to the order Ghabrivirales (most probably a totivirus or toti-like virus). Here, we found a capsidless +ssRNA mycovirus, SsYkV1, from hypovirulent strain SCH941 of S. sclerotiorum, and the RNA and RdRp of this mycovirus are trans-encapsidated in virions of a bisegmented dsRNA virus within the free-floating genus Botybirnavirus. Our results greatly expand our knowledge of the unique life cycles of RNA viruses.
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Rumbou A, Vainio EJ, Büttner C. Towards the Forest Virome: High-Throughput Sequencing Drastically Expands Our Understanding on Virosphere in Temperate Forest Ecosystems. Microorganisms 2021; 9:microorganisms9081730. [PMID: 34442809 PMCID: PMC8399312 DOI: 10.3390/microorganisms9081730] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 08/10/2021] [Accepted: 08/11/2021] [Indexed: 12/22/2022] Open
Abstract
Thanks to the development of HTS technologies, a vast amount of genetic information on the virosphere of temperate forests has been gained in the last seven years. To estimate the qualitative/quantitative impact of HTS on forest virology, we have summarized viruses affecting major tree/shrub species and their fungal associates, including fungal plant pathogens, mutualists and saprotrophs. The contribution of HTS methods is extremely significant for forest virology. Reviewed data on viral presence in holobionts allowed us a first attempt to address the role of virome in holobionts. Forest health is dependent on the variability of microorganisms interacting with the host tree/holobiont; symbiotic microbiota and pathogens engage in a permanent interplay, which influences the host. Through virus–virus interplays synergistic or antagonistic relations may evolve, which may drastically affect the health of the holobiont. Novel insights of these interplays may allow practical applications for forest plant protection based on endophytes and mycovirus biocontrol agents. The current analysis is conceived in light of the prospect that novel viruses may initiate an emergent infectious disease and that measures for the avoidance of future outbreaks in forests should be considered.
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Affiliation(s)
- Artemis Rumbou
- Faculty of Life Sciences, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-Universität zu Berlin, 14195 Berlin, Germany;
- Correspondence:
| | - Eeva J. Vainio
- Natural Resources Institute Finland, Forest Health and Biodiversity, Latokartanonkaari 9, 00790 Helsinki, Finland;
| | - Carmen Büttner
- Faculty of Life Sciences, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-Universität zu Berlin, 14195 Berlin, Germany;
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Nibert ML, Vong M, Fugate KK, Debat HJ. Evidence for contemporary plant mitoviruses. Virology 2018; 518:14-24. [PMID: 29438872 PMCID: PMC6668999 DOI: 10.1016/j.virol.2018.02.005] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 02/02/2018] [Accepted: 02/03/2018] [Indexed: 10/18/2022]
Abstract
Mitoviruses have small RNA(+) genomes, replicate in mitochondria, and have been shown to infect only fungi to date. For this report, sequences that appear to represent nearly complete plant mitovirus genomes were recovered from publicly available transcriptome data. Twenty of the refined sequences, 2684-2898 nt long and derived from 10 different species of land plants, appear to encompass the complete coding regions of contemporary plant mitoviruses, which furthermore constitute a monophyletic cluster within genus Mitovirus. Complete coding sequences of several of these viruses were recovered from multiple transcriptome (but not genome) studies of the same plant species and also from multiple plant tissues. Crop plants among implicated hosts include beet and hemp. Other new results suggest that such genuine plant mitoviruses were immediate ancestors to endogenized mitovirus elements now widespread in land plant genomes. Whether these mitoviruses are wholly cryptic with regard to plant health remains to be investigated.
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Affiliation(s)
- Max L Nibert
- Department of Microbiology & Immunobiology, Harvard Medical School, Boston, MA 02115, USA.
| | - Minh Vong
- Department of Microbiology & Immunobiology, Harvard Medical School, Boston, MA 02115, USA
| | - Karen K Fugate
- Sugarbeet and Potato Research, United States Department of Agriculture (USDA), Agricultural Research Service (ARS), Red River Valley Agricultural Research Center, Fargo, ND 58102, USA
| | - Humberto J Debat
- Instituto de Patología Vegetal, Centro de Investigaciones Agropecuarias, Instituto Nacional de Tecnología Agropecuaria (IPAVE-CIAP-INTA), X5020ICA, Córdoba, Argentina
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7
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Pandey B, Naidu RA, Grove GG. Detection and analysis of mycovirus-related RNA viruses from grape powdery mildew fungus Erysiphe necator. Arch Virol 2018; 163:1019-1030. [PMID: 29356991 DOI: 10.1007/s00705-018-3714-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 12/05/2017] [Indexed: 10/18/2022]
Abstract
The fungus, Erysiphe necator Schw., is an important plant pathogen causing powdery mildew disease in grapevines worldwide. In this study, high-throughput sequencing of double-stranded RNA extracted from the fungal tissue combined with bioinformatics was used to examine mycovirus-related sequences associated with E. necator. The results showed the presence of eight mycovirus-related sequences. Five of these sequences representing three new mycoviruses showed alignment with sequences of viruses classified in the genus Alphapartitivirus in the family Partitiviridae. Another three sequences representing three new mycoviruses showed similarity to classifiable members of the genus Mitovirus in the family Narnaviridae. These mycovirus isolates were named Erysiphe necator partitivirus 1, 2, and 3 (EnPV 1-3) and Erysiphe necator mitovirus 1, 2, and 3 (EnMV 1-3) reflecting their E. necator origin and their phylogenetic affiliation with other mycoviruses.
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Affiliation(s)
- B Pandey
- Department of Plant Pathology, Washington State University, Irrigated Agriculture Research and Extension Center, Prosser, WA, 99350, USA. .,Department of Plant Pathology, North Dakota State University, 306 Walster Hall, Fargo, ND, 58102, USA.
| | - R A Naidu
- Department of Plant Pathology, Washington State University, Irrigated Agriculture Research and Extension Center, Prosser, WA, 99350, USA
| | - G G Grove
- Department of Plant Pathology, Washington State University, Irrigated Agriculture Research and Extension Center, Prosser, WA, 99350, USA
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Characterization of Five Novel Mitoviruses in the White Pine Blister Rust Fungus Cronartium ribicola. PLoS One 2016; 11:e0154267. [PMID: 27196406 PMCID: PMC4873031 DOI: 10.1371/journal.pone.0154267] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 04/11/2016] [Indexed: 11/19/2022] Open
Abstract
The white pine blister rust (WPBR) fungus Cronartium ribicola (J.C. Fisch.) is an exotic invasive forest pathogen causing severe stem canker disease of native white pine trees (subgenus Strobus) in North America. The present study reports discovery of five novel mitoviruses in C. ribicola by deep RNA sequencing. The complete genome of each mitovirus was determined by rapid amplification of cDNA ends (RACE) and reverse transcriptase-polymerase chain reaction (RT-PCR). A single open reading frame (ORF) encoding a putative RNA-dependent RNA polymerase (RdRp) was detected in each of the viral genomes using mitochondrial genetic codes. Phylogenetic analysis indicated that the C. ribicola mitoviruses (CrMV1 to CrMV5) are new putative species of the genus Mitovirus. qRT-PCR and RNA-Seq analyses revealed that viral RNAs were significantly increased in fungal mycelia in cankered pine stems compared to expression during two different stages of spore development, suggesting that viral genome replication and transcription benefit from active growth of the host fungus. CrMVs were widespread with relatively high levels of minor allele frequency (MAF) in western North America. As the first report of mitoviruses in the Class Pucciniomycetes, this work allows further investigation of the dynamics of a viral community in the WPBR pathosystem, including potential impacts that may affect pathogenicity and virulence of the host fungus.
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Zhang T, Li W, Chen H, Yu H. Full genome sequence of a putative novel mitovirus isolated from Rhizoctonia cerealis. Arch Virol 2015; 160:1815-8. [PMID: 25916611 DOI: 10.1007/s00705-015-2431-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 04/16/2015] [Indexed: 11/27/2022]
Abstract
A putative novel mitovirus was found in isolate R1084 of the fungus Rhizoctonia cerealis, the causal agent of sharp eyespot of wheat in China. The full genome sequence of the virus was determined and analyzed. The complete cDNA sequence is 3149 nucleotides long with 59.7% A+T content. Using either the fungal mitochondrial or universal genetic code, the viral genome was found to contain a single large open reading frame that is predicted to encode a protein of 812 amino acids with an RNA-dependent RNA polymerase (RdRp) domain that is conserved in the mitovirus RdRp superfamily. The amino acid sequence of the RdRp domain is only 50% identical to the corresponding domain in Sclerotinia sclerotiorum mitovirus 11, and therefore, this virus is proposed to be a novel mitovirus, designated as Rhizoctonia cerealis mitovirus 1-R1084 (RcMV1-R1084). The distinct codon usage of RcMV1-R1084 hints that this virus is potentially able to replicate not only in mitochondria but also in the cytoplasm. This is the first report of a full-length genomic sequence of a putative mitovirus in R. cerealis.
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Affiliation(s)
- Tao Zhang
- College of life Sciences, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
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Xu Z, Wu S, Liu L, Cheng J, Fu Y, Jiang D, Xie J. A mitovirus related to plant mitochondrial gene confers hypovirulence on the phytopathogenic fungus Sclerotinia sclerotiorum. Virus Res 2014; 197:127-36. [PMID: 25550075 DOI: 10.1016/j.virusres.2014.12.023] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Revised: 12/15/2014] [Accepted: 12/18/2014] [Indexed: 11/17/2022]
Abstract
A double-stranded RNA (dsRNA) segment was isolated from a hypovirulent strain, HC025, of Sclerotinia sclerotiorum. The complete nucleotide sequence of the dsRNA was determined to be 2530 bp in length. Using the fungal mitochondrial genetic code, the positive strand of the dsRNA was found to contain a single large open reading frame (ORF) with the characteristic conserved motifs of the RNA-dependent RNA polymerase (RdRp). BLAST analysis revealed that RdRp shares 74% sequence identity with Sclerotinia sclerotiorum mitovirus 1 (SsMV1/KL-1). The positive strand of the dsRNA could be folded into potentially stable stem-loop structures at both the 5' and 3' terminal sequences. Moreover, the 5' and 3' terminal sequences were inverted complementary sequences and formed a panhandle structure. These results reveal that this dsRNA segment represents the replicative form of a mitovirus that is a strain of SsMV1 from the genus Mitovirus in the family Narnaviridae and was tentatively designated as Sclerotinia sclerotiorum mitovirus 1 (SsMV1/HC025). Sequence comparison and phylogenetic analysis suggest that mitovirus RdRp gene was evolutionarily related to plant mitochondrial genome. Our results demonstrate that SsMV1/HC025 infection exerted obvious effects on host biological properties. Hypovirulence feature and SsMV1/HC025 could be co-transmitted from hypovirulent strains to other virulent strains via hyphal contact. Thus, SsMV1/HC025 related to plant mitochondrial gene confers hypovirulence on S. sclerotiorum.
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Affiliation(s)
- Zhiyong Xu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China; Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Songsong Wu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China; Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Lijiang Liu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China; Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Jiasen Cheng
- Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Yanping Fu
- Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Daohong Jiang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China; Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China
| | - Jiatao Xie
- Provincial Key Laboratory of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, Hubei Province, People's Republic of China.
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11
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Detection and genetic characterisation of a novel mycovirus in Hymenoscyphus fraxineus, the causal agent of ash dieback. INFECTION GENETICS AND EVOLUTION 2014; 28:78-86. [DOI: 10.1016/j.meegid.2014.09.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 08/29/2014] [Accepted: 09/01/2014] [Indexed: 12/11/2022]
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12
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Molecular characterisation of novel mitoviruses associated with Sclerotinia sclerotiorum. Arch Virol 2014; 159:3157-60. [PMID: 25034670 DOI: 10.1007/s00705-014-2171-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 06/30/2014] [Indexed: 10/25/2022]
Abstract
Seven putative mitoviral genomes, representing four species from three Sclerotinia sclerotiorum isolates, were fully sequenced. The genome lengths ranged from 2438 to 2815 nucleotides. The RNA-dependent RNA polymerase (RdRp) of one genome shared high amino acid (aa) sequence identity (98.5 %) with the previously described Sclerotinia sclerotiorum mitovirus 2 (SsMV2/NZ1) and was provisionally assigned the name SsMV2/14563. The RdRps of three of the genomes with closest aa sequence identity of 78.8-79.3 % to Sclerotinia sclerotiorum mitovirus 1 (SsMV1/KL1) were provisionally considered to represent a new species, and the corresponding virus was named Sclerotinia sclerotiorum mitovirus 5 (SsMV5/11691, SsMV5/14563 and SsMV5/Lu471). The remaining two novel genomes, for which the viruses were provisionally named Sclerotinia sclerotiorum mitovirus 6 (SsMV6/14563 and SsMV6/Lu471) and Sclerotinia sclerotiorum mitovirus 7 (SsMV7/Lu471), showed closest aa sequence identities to Sclerotinia sclerotiorum mitovirus 3 (SsMV3/NZ1; 57.5-57.8 %) and Cryphonectria cubensis mitovirus 1a (CcMV1a; 32 %), respectively. The RdRp proteins of all seven genomes contained the conserved aa sequence motifs (I-IV) previously reported for mitoviruses, and their 5' and 3' untranslated regions (UTRs) have the potential to fold into stem-loop secondary structures.
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13
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Kitahara R, Ikeda Y, Shimura H, Masuta C, Ezawa T. A unique mitovirus from Glomeromycota, the phylum of arbuscular mycorrhizal fungi. Arch Virol 2014; 159:2157-60. [PMID: 24532299 DOI: 10.1007/s00705-014-1999-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 01/18/2014] [Indexed: 11/29/2022]
Abstract
Arbuscular mycorrhizal (AM) fungi that belong to the phylum Glomeromycota associate with most land plants and supply mineral nutrients to the host plants. One of the four viral segments found by deep-sequencing of dsRNA in the AM fungus Rhizophagus clarus strain RF1 showed similarity to mitoviruses and is characterized in this report. The genome segment is 2,895 nucleotides in length, and the largest ORF was predicted by applying either the mold mitochondrial or the universal genetic code. The ORF encodes a polypeptide of 820 amino acids with a molecular mass of 91.2 kDa and conserves the domain of the mitovirus RdRp superfamily. Accordingly, the dsRNA was designated as R. clarus mitovirus 1 strain RF1 (RcMV1-RF1). Mitoviruses are localized exclusively in mitochondria and thus generally employ the mold mitochondrial genetic code. The distinct codon usage of RcMV1-RF1, however, suggests that the virus is potentially able to replicate not only in mitochondria but also in the cytoplasm. RcMV1-RF1 RdRp showed the highest similarity to the putative RdRp of a mitovirus-like ssRNA found in another AM fungus, followed by RdRp of a mitovirus in an ascomycotan ectomycorrhizal fungus. The three mitoviruses found in the three mycorrhizal fungi formed a deeply branching clade that is distinct from the two major clades in the genus Mitovirus.
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Affiliation(s)
- Ryoko Kitahara
- Graduate School of Agriculture, Hokkaido University, Sapporo, 060-8589, Japan
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