1
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Lutz T, Langer GJ, Heinze C. A virus from Aspergillus cibarius with features of alpha- and betachrysoviruses. Virus Genes 2024; 60:71-79. [PMID: 38160229 PMCID: PMC10861612 DOI: 10.1007/s11262-023-02043-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Accepted: 11/21/2023] [Indexed: 01/03/2024]
Abstract
From the ascomycete Aspergillus cibarius strain NW-FVA 2590, which was originally isolated from a root, associated with stem collar necrosis of Fraxinus excelsior L., a novel virus was isolated and characterized. Its genome is encoded on three monocistronic dsRNA segments ranging from 3683 bp (dsRNA 1) over 3093 (dsRNA 2) to 2902 bp (dsRNA 3), which are packed in isometric particles of around 35 nm. While the viral RdRp (P1) is encoded on segment 1, protein sequencing showed that two more structural proteins are present which are translated from dsRNA 2 (P2) and dsRNA 3 (P3) and possibly form the viral capsid. Additionally, P2 and P3 may undergo posttranslational modifications since the detected proteins bands deviated from the calculated sizes. Due to its phylogenetic position, the novel virus was grouped in the family of Chrysoviridae and was tentatively denominated as Aspergillus cibarius chrysovirus 1 (AcCV1). Due to its composition, biological properties and phylogenetic position, distant from the genera Alphachrysovirus and Betachrysovirus, we suggest to position AcCV1 in a proposed genus "Gammachrysovirus".
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Affiliation(s)
- Tobias Lutz
- Institute of Plant Science and Microbiology, University of Hamburg, Molecular Phytopathology, Ohnhorststr. 18, 22609, Hamburg, Germany
| | - Gitta Jutta Langer
- Nordwestdeutsche Forstliche Versuchsanstalt, Grätzelstr. 2, 37079, Göttingen, Germany
| | - Cornelia Heinze
- Institute of Plant Science and Microbiology, University of Hamburg, Molecular Phytopathology, Ohnhorststr. 18, 22609, Hamburg, Germany.
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2
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Zhou X, Zhang HL, Lu XW, Zhao P, Liu F, Qi ZH, Tang F, Duan WJ, Cai L. Applying meta-data of soybean grain in origin trace and quarantine inspection. Food Res Int 2022; 162:111998. [DOI: 10.1016/j.foodres.2022.111998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 09/20/2022] [Accepted: 09/26/2022] [Indexed: 11/04/2022]
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3
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Characterization of a novel magoulivirus isolated from the phytopathogenic fungus Verticillium dahlia. Arch Virol 2022; 167:2387-2390. [PMID: 35927384 DOI: 10.1007/s00705-022-05524-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Accepted: 05/23/2022] [Indexed: 11/02/2022]
Abstract
A new positive-sense single-stranded RNA (+ssRNA) mycovirus, Verticillium dahliae magoulivirus 1 (VdMoV1), was isolated from two strains (2-19 and XLZ70) of Verticillium dahliae. The complete genome of VdMoV1 is 2303 nucleotides (nt) in length and has a large open reading frame (nt positions from 61 to 1938) encoding an RNA-dependent RNA polymerase (RdRp). A multiple sequence alignment indicated that the central region of the RdRp encoded by VdMoV1 contains eight typical viral RdRp motifs. BLASTp analysis demonstrated that VdMoV1 has the highest sequence identity (86.88%) to Bremia lactucae associated ourmia-like virus 2 (BlaOLV2). Phylogenetic analysis revealed that VdMoV1 is a new member of the genus Magoulivirus. As far as we know, VdMoV1 is the first reported member of the family Botourmiaviridae infecting V. dahliae.
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4
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Yin C, Li J, Wang D, Zhang D, Song J, Kong Z, Wang B, Hu X, Klosterman SJ, Subbarao KV, Chen J, Dai X. A secreted ribonuclease effector from Verticillium dahliae localizes in the plant nucleus to modulate host immunity. MOLECULAR PLANT PATHOLOGY 2022; 23:1122-1140. [PMID: 35363930 PMCID: PMC9276946 DOI: 10.1111/mpp.13213] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 01/21/2022] [Accepted: 03/11/2022] [Indexed: 05/03/2023]
Abstract
The arms race between fungal pathogens and plant hosts involves recognition of fungal effectors to induce host immunity. Although various fungal effectors have been identified, the effector functions of ribonucleases are largely unknown. Herein, we identified a ribonuclease secreted by Verticillium dahliae (VdRTX1) that translocates into the plant nucleus to modulate immunity. The activity of VdRTX1 causes hypersensitive response (HR)-related cell death in Nicotiana benthamiana and cotton. VdRTX1 possesses a signal peptide but is unlikely to be an apoplastic effector because its nuclear localization in the plant is necessary for cell death induction. Knockout of VdRTX1 significantly enhanced V. dahliae virulence on tobacco while V. dahliae employs the known suppressor VdCBM1 to escape the immunity induced by VdRTX1. VdRTX1 homologs are widely distributed in fungi but transient expression of 24 homologs from other fungi did not yield cell death induction, suggesting that this function is specific to the VdRTX1 in V. dahliae. Expression of site-directed mutants of VdRTX1 in N. benthamiana leaves revealed conserved ligand-binding sites that are important for VdRTX1 function in inducing cell death. Thus, VdRTX1 functions as a unique HR-inducing effector in V. dahliae that contributes to the activation of plant immunity.
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Affiliation(s)
- Chun‐Mei Yin
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
- Institute of Food Science TechnologyChinese Academy of Agricultural SciencesBeijingChina
| | - Jun‐Jiao Li
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Dan Wang
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Dan‐Dan Zhang
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Jian Song
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Zhi‐Qiang Kong
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Bao‐Li Wang
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Xiao‐Ping Hu
- State Key Laboratory of Crop Stress Biology for Arid AreasCollege of Plant ProtectionNorthwest A&F UniversityYanglingChina
| | - Steven J. Klosterman
- United States Department of AgricultureAgricultural Research ServiceSalinasCaliforniaUSA
| | - Krishna V. Subbarao
- Department of Plant PathologyUniversity of California, Davis, c/o U.S. Agricultural Research StationSalinasCaliforniaUSA
| | - Jie‐Yin Chen
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
| | - Xiao‐Feng Dai
- The State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijingChina
- Institute of Food Science TechnologyChinese Academy of Agricultural SciencesBeijingChina
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5
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Shahi S, Chiba S, Kondo H, Suzuki N. Cryphonectria nitschkei chrysovirus 1 with unique molecular features and a very narrow host range. Virology 2020; 554:55-65. [PMID: 33383414 DOI: 10.1016/j.virol.2020.11.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 11/21/2020] [Accepted: 11/23/2020] [Indexed: 12/20/2022]
Abstract
Cryphonectria nitschkei chrysovirus 1 (CnCV1), was described earlier from an ascomycetous fungus, Cryphonectria nitschkei strain OB5/11, collected in Japan; its partial sequence was reported a decade ago. Complete sequencing of the four genomic dsRNA segments revealed molecular features similar to but distinct from previously reported members of the family Chrysoviridae. Unique features include the presence of a mini-cistron preceding the major large open reading frame in each genomic segment. Common features include the presence of CAA repeats in the 5'-untranslated regions and conserved terminal sequences. CnCV1-OB5/11 could be laterally transferred to C. nitschkei and its relatives C. radicalis and C. naterciae via coculturing, virion transfection and protoplast fusion, but not to fungal species other than the three species mentioned above, even within the genus Cryphonectria, suggesting a very narrow host range. Phenotypic comparison of a few sets of CnCV1-infected and -free isogenic strains showed symptomless infection in new hosts.
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Affiliation(s)
- Sabitree Shahi
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan
| | - Sotaro Chiba
- Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi, 464-8601, Japan
| | - Hideki Kondo
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan
| | - Nobuhiro Suzuki
- Institute of Plant Science and Resources, Okayama University, Kurashiki, Okayama, 710-0046, Japan.
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6
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Wang S, Yang Z, Zhang T, Li N, Cao Q, Li G, Yuan Y, Liu D. Molecular Characterization of a Chrysovirus Isolated From the Citrus Pathogen Penicillium crustosum and Related Fungicide Resistance Analysis. Front Cell Infect Microbiol 2019; 9:156. [PMID: 31157173 PMCID: PMC6529537 DOI: 10.3389/fcimb.2019.00156] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 04/26/2019] [Indexed: 12/30/2022] Open
Abstract
Penicillium sp. are damaging to a range of foods and fruits including citrus. To date, double-stranded (ds)RNA viruses have been reported in most Penicillium species but not in citrus pathogen P. crustosum. Here we report a novel dsRNA virus, designated as Penicillium crustosum chrysovirus 1 (PcCV1) and isolated from P. crustosum strain HS-CQ15. PcCV1 genome comprises four dsRNA segments, referred to as dsRNA1, dsRNA2, dsRNA3, and dsRNA4, which are 3600, 3177, 3078, and 2808 bp in length, respectively. Sequence analysis revealed the presence of four open reading frames (ORFs) in the PcCV1 genome. ORF1 in dsRNA1 encodes a putative RNA-dependent RNA polymerase (RdRp) and ORF2 in dsRNA2 encodes a putative coat protein (CP). The two remaining ORFs, ORF3 in dsRNA3 and ORF4 in dsRNA4, encode proteins of unknown function. Phylogenetic analysis based on RdRp sequences showed that PcCV1 clusters with other members of the genus Chrysovirus, family Chrysoviridae. Transmission electron microscope (TEM) analysis revealed that the PcCV1 visions are approximately 40 nm in diameter. Regarding biological effects of PcCV1, HS-CQ15 harboring the chrysovirus exhibited no obvious difference in colony morphology under fungicide-free conditions but decreased resistance to demethylation inhibitor (DMI)-fungicide prochloraz, as compared to PcCV1-cured strain. Here we provide the first evidence of a virus present in citrus pathogenic fungus P. crustosum and the chrysovirus-induced change in fungicide-resistance of its host fungus.
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Affiliation(s)
- Shengqiang Wang
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - Zhu Yang
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - Tingfu Zhang
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - Na Li
- College of Life Science and Technology, Honghe University, Mengzi, China
| | - Qianwen Cao
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - Guoqi Li
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - Yongze Yuan
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
| | - Deli Liu
- Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, China
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7
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Ejmal MA, Holland DJ, MacDiarmid RM, Pearson MN. A novel chrysovirus from a clinical isolate of Aspergillus thermomutatus affects sporulation. PLoS One 2018; 13:e0209443. [PMID: 30571748 PMCID: PMC6301774 DOI: 10.1371/journal.pone.0209443] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 12/05/2018] [Indexed: 12/15/2022] Open
Abstract
A clinical isolate of Aspergillus thermomutatus (Teleomorph: Neosartorya pseudofischeri) was found to contain ~35 nm isometric virus-like particles associated with four double-stranded (ds) RNA segments, each of which coded for a single open reading frame. The longest dsRNA element (3589 nt) encodes a putative RNA-dependent RNA polymerase (1114 aa), the second longest dsRNA element (2772 nt) encodes a coat protein (825 aa), and the other two dsRNAs (2676 nt, 2514 nt) encode hypothetical proteins of 768 aa and 711 aa, respectively. Phylogenetic analysis of the amino acid sequences showed 41-60% similarity to the proteins coded by the dsRNAs of the most closely related virus, Penicillium janczewskii chrysovirus 2, indicating that it is a new species based on the International Committee on Taxonomy of Viruses criteria for the genus Chrysovirus. This is the first virus reported from A. thermomutatus and was tentatively named Aspergillus thermomutatus chrysovirus 1. A virus free line of the fungal isolate, cured by cycloheximide treatment, produced large numbers of conidia but no ascospores at both 20°C and 37°C, whereas the virus infected line produced ten-fold fewer conidia at 20°C and a large number of ascospores at both temperatures. The effects of the virus on fungal sporulation have interesting implications for the spread of the fungus and possible use of the virus as a biological control agent.
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Affiliation(s)
- Mahjoub A. Ejmal
- School of Biological Sciences, the University of Auckland, Auckland, New Zealand
| | - David J. Holland
- Infectious Diseases Unit, Division of Medicine, Staff Centre, Middlemore Hospital, Auckland, New Zealand
| | - Robin M. MacDiarmid
- School of Biological Sciences, the University of Auckland, Auckland, New Zealand
- The New Zealand Institute for Plant and Food Research Limited, Auckland, New Zealand
| | - Michael N. Pearson
- School of Biological Sciences, the University of Auckland, Auckland, New Zealand
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8
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CMV2b-Dependent Regulation of Host Defense Pathways in the Context of Viral Infection. Viruses 2018; 10:v10110618. [PMID: 30423959 PMCID: PMC6265714 DOI: 10.3390/v10110618] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Revised: 11/06/2018] [Accepted: 11/08/2018] [Indexed: 01/26/2023] Open
Abstract
RNA silencing (or RNA interference, RNAi) plays direct roles in plant host defenses against viruses. Viruses encode suppressors of RNAi (VSRs) to counteract host antiviral defenses. The generation of transgenic plants expressing VSRs facilitates the understanding of the mechanisms of VSR-mediated interference with the endogenous silencing pathway. However, studying VSRs independent of other viral components simplifies the complex roles of VSRs during natural viral infection. While suppression of transgene silencing by the VSR 2b protein encoded by cucumber mosaic virus (CMV) requires 2b-small RNA (sRNA) binding activity, suppression of host antiviral defenses requires the binding activity of both sRNAs and AGOs proteins. This study, aimed to understand the functions of 2b in the context of CMV infection; thus, we performed genome-wide analyses of differential DNA methylation regions among wild-type CMV-infected, CMVΔ2b-infected, and 2b-transgenic Arabidopsis plants. These analyses, together with transcriptome sequencing and RT-qPCR analyses, show that while the majority of induced genes in 2b-transgenic plants were involved in extensive metabolic pathways, CMV-infection 2b-dependent induced genes were enriched in plant immunity pathways, including salicylic acid (SA) signaling. Together with infection with CMV mutants that expressed the 2b functional domains of sRNA or AGO binding, our data demonstrate that CMV-accelerated SA signaling depends on 2b-sRNA binding activity which is also responsible for virulence.
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9
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Zhai L, Zhang M, Hong N, Xiao F, Fu M, Xiang J, Wang G. Identification and Characterization of a Novel Hepta-Segmented dsRNA Virus From the Phytopathogenic Fungus Colletotrichum fructicola. Front Microbiol 2018; 9:754. [PMID: 29725323 PMCID: PMC5917037 DOI: 10.3389/fmicb.2018.00754] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 04/04/2018] [Indexed: 11/19/2022] Open
Abstract
A novel hepta-segmented double-stranded RNA (dsRNA) virus was isolated and characterized from the strain FJ-4 of the phytopathogenic fungus Colletotrichum fructicola, and was named Colletotrichum fructicola chrysovirus 1 (CfCV1). The full-length cDNAs of dsRNA1–7 were 3620, 2801, 2687, 2437, 1750, 1536, and 1211 bp, respectively. The 5′- and 3′-untranslated regions of the seven dsRNAs share highly similar internal sequence and contain conserved sequence stretches, indicating that they have a common virus origin. The 5′-and 3′-UTRs of the seven dsRNAs were predicted to fold into stable stem-loop structures. CfCV1 contains spherical virions that are 35 nm in diameter consisting of seven segments. The largest dsRNA of CfCV1 encodes an RNA-dependent RNA polymerase (RdRp), and the second dsRNA encodes a viral capsid protein (CP). The dsRNA5 encodes a C2H2-type zinc finger protein containing an R-rich region and a G-rich region. The smallest dsRNA is a satellite-like RNA. The functions of the other proteins encoded by dsRNA3, dsRNA4, dsRNA6 are unknown. Phylogenetic analysis, based on RdRp and CP, indicated that CfCV1 is phylogenetically related to Botryosphaeria dothidea chrysovirus 1 (BdCV1), and Penicillium janczewskii chrysovirus 2 (PjCV2), a cluster of an independent cluster II group in the family Chrysoviridae. Importantly, all the seven segments of CfCV1 were transmitted successfully to other virus-free strains with an all-or-none fashion. CfCV1 exerts minor influence on the growth of C. fructicola but can confer hypovirulence to the fungal host. To our knowledge, this is the first report of a hepta-segmented tentative chrysovirus in C. fructicola.
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Affiliation(s)
- Lifeng Zhai
- College of Life Science and Technology, Yangtze Normal University, Chongqing, China.,National Key Laboratory of Agromicrobiology, Huazhong Agricultural University, Wuhan, China
| | - Meixin Zhang
- College of Life Science and Technology, Yangtze Normal University, Chongqing, China.,National Key Laboratory of Agromicrobiology, Huazhong Agricultural University, Wuhan, China
| | - Ni Hong
- National Key Laboratory of Agromicrobiology, Huazhong Agricultural University, Wuhan, China.,College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, China
| | - Feng Xiao
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Min Fu
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Jun Xiang
- Institute of Plant Quarantine, Chinese Academy of Inspection and Quarantine, Beijing, China
| | - Guoping Wang
- National Key Laboratory of Agromicrobiology, Huazhong Agricultural University, Wuhan, China.,College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, China
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10
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Characterization of a novel single-stranded RNA mycovirus related to invertebrate viruses from the plant pathogen Verticillium dahliae. Arch Virol 2017; 163:771-776. [PMID: 29147792 DOI: 10.1007/s00705-017-3644-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 10/04/2017] [Indexed: 12/13/2022]
Abstract
Fungal viruses, also known as mycoviruses, are widespread in all major groups of fungi. Mycoviruses from plant pathogens can reduce the virulence of their host fungus and have therefore potential as biological control agents. This has spurred the identification of novel mycoviruses in plant pathogens, research which is greatly contributing to our understanding of these organisms. In this work, we report the characterization of a novel monopartite mycovirus from Verticillium dahliae, the main causal agent of Verticillium wilt. This novel mycovirus, which we termed Verticillium dahliae RNA virus 1 (VdRV1), was identified in three different isolates of V. dahliae collected in olive growing areas of the Guadalquivir valley, southern Spain. We determined that the VdRV1 genome is a positive (+) single-stranded (ss) RNA, 2631 nucleotides in length, containing two open reading frames. VdRV1 showed few similarities with known mycoviruses, only with a group of unassigned (+) ssRNA mycoviruses which are related to plant viruses classified within the family Tombusviridae. However, phylogenetic analysis revealed that VdRV1 and the unassigned (+) ssRNA mycoviruses have a closer relationship with recently reported invertebrate viruses. This result indicates that as more viral sequences become available, the relationships of mycoviruses with viruses from other hosts should be reexamined. Additionally, the work supports the hypothesis of a heterogeneous origin for mycoviruses.
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11
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Wu J, Wang C, Zhu X, Chen J. Sequence analysis of double-strand RNA6 and RNA9 from the fungus Sclerotium hydrophilum. Arch Virol 2017; 162:2913-2917. [DOI: 10.1007/s00705-017-3430-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 05/01/2017] [Indexed: 11/24/2022]
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12
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Molecular Characterization of a Trisegmented Mycovirus from the Plant Pathogenic Fungus Colletotrichum gloeosporioides. Viruses 2016; 8:v8100268. [PMID: 27690081 PMCID: PMC5086604 DOI: 10.3390/v8100268] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 09/15/2016] [Accepted: 09/19/2016] [Indexed: 01/26/2023] Open
Abstract
A novel double-stranded RNA (dsRNA) mycovirus, consisting of three dsRNA genome segments and possibly belonging to the family Chrysoviridae, was isolated from the filamentous phytopathogenic fungus Colletotrichum gloeosporioides and designated as Colletotrichum gloeosprioides chrysovirus 1 (CgCV1). The three dsRNAs of the CgCV1 genome with lengths of 3397, 2869, and 2630 bp (dsRNAs1–3) were found to contain a single open reading frame (ORF) putatively encoding the RNA-dependent RNA polymerase (RdRp), a capsid protein, and a protease, respectively, all of which exhibited some degree of sequence similarity to the comparable putative proteins encoded by the genus Chrysovirus. The 5′- and 3′-untranslated regions in each dsRNA segment contained similar sequences that were strictly conserved at the termini. Moreover, isometric virus-like particles (VLPs) with a diameter of approximately 40 nm were extracted from fungal mycelia. Phylogenetic analysis based on the conserved dsRNA1-encoded RdRp showed that CgCV1 is a new virus belonging to the Chrysoviridae family. BLAST analysis revealed the presence of CgCV1-like sequences in the chromosomes of Medicago truncatula and Solanum tuberosum. Moreover, some sequences in the transcriptome shotgun assembly (TSA) library and expressed sequence tag database (ESTdb) of other eudicot and monocot plants were also found to be related to CgCV1.
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13
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Complete nucleotide sequences of dsRNA2 and dsRNA7 detected in the phytopathogenic fungus Sclerotium hydrophilum and their close phylogenetic relationship to a group of unclassified viruses. Virus Genes 2016; 52:823-827. [DOI: 10.1007/s11262-016-1375-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Accepted: 07/19/2016] [Indexed: 11/24/2022]
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14
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Detection and characterization of a novel Gammapartitivirus in the phytopathogenic fungus Colletotrichum acutatum strain HNZJ001. Virus Res 2014; 190:104-9. [DOI: 10.1016/j.virusres.2014.05.028] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 05/28/2014] [Accepted: 05/29/2014] [Indexed: 10/25/2022]
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15
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The complete nucleotide sequence of a novel partitivirus isolated from the plant pathogenic fungus Verticillium albo-atrum. Arch Virol 2014; 159:3141-4. [DOI: 10.1007/s00705-014-2156-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 06/19/2014] [Indexed: 10/25/2022]
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16
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Wang L, Jiang J, Wang Y, Hong N, Zhang F, Xu W, Wang G. Hypovirulence of the phytopathogenic fungus Botryosphaeria dothidea: association with a coinfecting chrysovirus and a partitivirus. J Virol 2014; 88:7517-27. [PMID: 24760881 PMCID: PMC4054428 DOI: 10.1128/jvi.00538-14] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 04/08/2014] [Indexed: 12/13/2022] Open
Abstract
UNLABELLED Botryosphaeria dothidea is an important pathogenic fungus causing fruit rot, leaf and stem ring spots and dieback, stem canker, stem death or stool mortality, and decline of pear trees. Seven double-stranded RNAs (dsRNAs; dsRNAs 1 to 7 with sizes of 3,654, 2,773, 2,597, 2,574, 1,823, 1,623, and 511 bp, respectively) were identified in an isolate of B. dothidea exhibiting attenuated growth and virulence and a sectoring phenotype. Characterization of the dsRNAs revealed that they belong to two dsRNA mycoviruses. The four largest dsRNAs (dsRNAs 1 to 4) are the genomic components of a novel member of the family Chrysoviridae (tentatively designated Botryosphaeria dothidea chrysovirus 1 [BdCV1]), a view supported by the morphology of the virions and phylogenetic analysis of the putative RNA-dependent RNA polymerases (RdRps). Two other dsRNAs (dsRNAs 5 and 6) are the genomic components of a novel member of the family Partitiviridae (tentatively designated Botryosphaeria dothidea partitivirus 1 [BdPV1]), which is placed in a clade distinct from other established partitivirus genera on the basis of the phylogenetic analysis of its RdRp. The smallest dsRNA, dsRNA7, seems to be a noncoding satellite RNA of BdPV1 on the basis of the conservation of its terminal sequences in BdPV1 genomic segments and its cosegregation with BdPV1 after horizontal transmission. This is the first report of a chrysovirus and a partitivirus infecting B. dothidea and of a chrysovirus associated with the hypovirulence of a phytopathogenic fungus. IMPORTANCE Our studies identified and characterized two novel mycoviruses, Botryosphaeria dothidea chrysovirus 1 (BdCV1) and Botryosphaeria dothidea partitivirus 1 (BdPV1), associated with the hypovirulence of an important fungus pathogenic to fruit trees. This is the first report of a chrysovirus and a partitivirus infecting B. dothidea and of a chrysovirus associated with the hypovirulence of a phytopathogenic fungus. BdCV1 appears to be a good candidate for the biological control of the serious disease induced by B. dothidea. Additionally, BdPV1 is placed in a clade distinct from the established genera. The BdCV1 capsid has two major structural proteins, and the capsid is distinct from that made up by a single polypeptide of the typical chrysoviruses. BdPV1 is the second partitivirus in which the putative capsid protein shares no significant identity with any mycovirus protein. A small accompanying dsRNA that is presumed to be a noncoding satellite RNA of BdPV1 is the first of its kind reported for a partitivirus.
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Affiliation(s)
- LiPing Wang
- State Key Laboratory of Agricultural Microbiology, Wuhan, Hubei, People's Republic of China College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, People's Republic of China National Indoor Conservation Center of Virus-Free Germplasms of Fruit Crops, Wuhan, Hubei, People's Republic of China Lab of Key Lab of Plant Pathology of Hubei Province, Wuhan, Hubei, People's Republic of China
| | - JingJing Jiang
- State Key Laboratory of Agricultural Microbiology, Wuhan, Hubei, People's Republic of China College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, People's Republic of China National Indoor Conservation Center of Virus-Free Germplasms of Fruit Crops, Wuhan, Hubei, People's Republic of China Lab of Key Lab of Plant Pathology of Hubei Province, Wuhan, Hubei, People's Republic of China
| | - YanFen Wang
- State Key Laboratory of Agricultural Microbiology, Wuhan, Hubei, People's Republic of China College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, People's Republic of China National Indoor Conservation Center of Virus-Free Germplasms of Fruit Crops, Wuhan, Hubei, People's Republic of China Lab of Key Lab of Plant Pathology of Hubei Province, Wuhan, Hubei, People's Republic of China
| | - Ni Hong
- State Key Laboratory of Agricultural Microbiology, Wuhan, Hubei, People's Republic of China College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, People's Republic of China National Indoor Conservation Center of Virus-Free Germplasms of Fruit Crops, Wuhan, Hubei, People's Republic of China Lab of Key Lab of Plant Pathology of Hubei Province, Wuhan, Hubei, People's Republic of China
| | - Fangpeng Zhang
- State Key Laboratory of Agricultural Microbiology, Wuhan, Hubei, People's Republic of China College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, People's Republic of China National Indoor Conservation Center of Virus-Free Germplasms of Fruit Crops, Wuhan, Hubei, People's Republic of China Lab of Key Lab of Plant Pathology of Hubei Province, Wuhan, Hubei, People's Republic of China
| | - WenXing Xu
- State Key Laboratory of Agricultural Microbiology, Wuhan, Hubei, People's Republic of China College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, People's Republic of China National Indoor Conservation Center of Virus-Free Germplasms of Fruit Crops, Wuhan, Hubei, People's Republic of China Lab of Key Lab of Plant Pathology of Hubei Province, Wuhan, Hubei, People's Republic of China
| | - GuoPing Wang
- State Key Laboratory of Agricultural Microbiology, Wuhan, Hubei, People's Republic of China College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, People's Republic of China National Indoor Conservation Center of Virus-Free Germplasms of Fruit Crops, Wuhan, Hubei, People's Republic of China Lab of Key Lab of Plant Pathology of Hubei Province, Wuhan, Hubei, People's Republic of China
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Li L, Liu J, Xu A, Wang T, Chen J, Zhu X. Molecular characterization of a trisegmented chrysovirus isolated from the radish Raphanus sativus. Virus Res 2013; 176:169-78. [PMID: 23850842 DOI: 10.1016/j.virusres.2013.06.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 06/06/2013] [Accepted: 06/08/2013] [Indexed: 12/24/2022]
Abstract
Radish (Raphanus sativus L.) is cultivated worldwide and is of agronomic importance. dsRNAs associated with partitiviruses were previously found in many R. sativus varieties. In this study, three large dsRNAs from radish were cloned using a modified single primer amplification technique. These three dsRNAs-of lengths 3638, 3517 and 3299 bp-shared conserved untranslated terminal regions, and each contained a major open reading frame putatively encoding the chrysoviral replicase, capsid protein and protease respectively. Isometric virus-like particles (VLP), approximately 45nm in diameter, were isolated from the infected radish plants. Northern blotting indicated that these dsRNAs were encapsidated in the VLP. The virus containing these dsRNA genome segments was named Raphanus sativus chrysovirus 1 (RasCV1). Phylogenetic analysis revealed that RasCV1 is a new species of the Chrysoviridae family and forms a plant taxon with another putative plant chrysovirus, Anthurium mosaic-associated virus (AmaCV). Furthermore, no fungal mycelia were observed in radish leaf tissues stained with trypan blue. These results indicated that RasCV1 is most likely a plant chrysovirus rather than a chrysovirus in symbiotic fungi. An exhaustive BLAST analysis of RasCV1 and AmaCV revealed that chrysovirus-like viruses might widely exist in eudicot and monocot plants and that endogenization of chrysovirus segments into plant genome might have ever happened.
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Affiliation(s)
- Liqiang Li
- College of Life Science, Zhejiang University, Hangzhou 310058, China
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Feng Z, Zhu H, Li Z, Shi Y, Zhao L, Liu L, Jiang D. Complete genome sequence of a novel dsRNA mycovirus isolated from the phytopathogenic fungus Verticillium dahliae Kleb. Arch Virol 2013; 158:2621-3. [DOI: 10.1007/s00705-013-1774-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 05/21/2013] [Indexed: 11/28/2022]
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