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Zhou Q, Yao Z, Cao X, Chen Y, Zou C, Chen B. Fusarium sacchari hypovirus 1, a Member of Hypoviridae with Virulence Attenuation Capacity in Phytopathogenic Fusarium Species. Viruses 2024; 16:608. [PMID: 38675949 PMCID: PMC11054305 DOI: 10.3390/v16040608] [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: 03/17/2024] [Revised: 04/05/2024] [Accepted: 04/11/2024] [Indexed: 04/28/2024] Open
Abstract
In a survey of mycoviruses in Fusarium species that cause sugarcane Pokkah boeng disease, twelve Fusarium strains from three Fusarium species (F. sacchari, F. andiyazi, and F. solani) were found to contain Fusarium sacchari hypovirus 1 (FsHV1), which we reported previously. The genomes of these variants range from 13,966 to 13,983 nucleotides, with 98.6% to 99.9% nucleotide sequence identity and 98.70% to 99.9% protein sequence similarity. Phylogenetic analysis placed these FsHV1 variants within the Alphahypovirus cluster of Hypoviridae. Intriguingly, no clear correlation was found between the geographic origin and host specificity of these viral variants. Additionally, six out of the twelve variants displayed segmental deletions of 1.5 to 1.8 kilobases, suggesting the existence of defective viral dsRNA. The presence of defective viral dsRNA led to a two-thirds reduction in the dsRNA of the wild-type viral genome, yet a tenfold increase in the total viral dsRNA content. To standardize virulence across natural strains, all FsHV1 strains were transferred into a single, virus-free Fusarium recipient strain, FZ06-VF, via mycelial fusion. Strains of Fusarium carrying FsHV1 exhibited suppressed pigment synthesis, diminished microspore production, and a marked decrease in virulence. Inoculation tests revealed varying capacities among different FsHV1 variants to modulate fungal virulence, with the strain harboring the FsHV1-FSA1 showing the lowest virulence, with a disease severity index (DSI) of 3.33, and the FsHV1-FS1 the highest (DSI = 17.66). The identification of highly virulent FsHV1 variants holds promise for the development of biocontrol agents for Pokkah boeng management.
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Affiliation(s)
- Qiujuan Zhou
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources and Ministry and Province Co-Sponsored Center of Collaborative Innovation for Sugarcane Industry, College of Life Science and Technology, Guangxi University, Nanning 530004, China
| | - Ziting Yao
- Plant Protection Research Institute, Guangxi Academy of Agriculture Science, Nanning 530007, China
| | - Xueying Cao
- Guangxi Key Laboratory of Sugarcane Biology, College of Agriculture, Guangxi University, Nanning 530004, China
| | - Yuejia Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources and Ministry and Province Co-Sponsored Center of Collaborative Innovation for Sugarcane Industry, College of Life Science and Technology, Guangxi University, Nanning 530004, China
| | - Chengwu Zou
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources and Ministry and Province Co-Sponsored Center of Collaborative Innovation for Sugarcane Industry, College of Life Science and Technology, Guangxi University, Nanning 530004, China
- Guangxi Key Laboratory of Sugarcane Biology, College of Agriculture, Guangxi University, Nanning 530004, China
| | - Baoshan Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources and Ministry and Province Co-Sponsored Center of Collaborative Innovation for Sugarcane Industry, College of Life Science and Technology, Guangxi University, Nanning 530004, China
- Guangxi Key Laboratory of Sugarcane Biology, College of Agriculture, Guangxi University, Nanning 530004, China
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Ahmad F, Tomada S, Poonsiri T, Baric S. Molecular genetic variability of Cryphonectria hypovirus 1 associated with Cryphonectria parasitica in South Tyrol (northern Italy). Front Microbiol 2024; 15:1291542. [PMID: 38476955 PMCID: PMC10927965 DOI: 10.3389/fmicb.2024.1291542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Accepted: 01/25/2024] [Indexed: 03/14/2024] Open
Abstract
Cryphonectria hypovirus 1 (CHV-1) has been widely studied and used as a biocontrol agent because of its ability to infect the chestnut blight fungus, Cryphonectria parasitica, and to reduce its virulence. Knowledge about the hypovirus, its presence, and diversity is completely lacking in South Tyrol (northern Italy), which may obstruct biocontrol measures for chestnut blight based on CHV-1. This work aimed to study the occurrence of CHV-1 infecting C. parasitica in South Tyrol and to perform a genetic characterization of the hypovirus. In South Tyrol, CHV-1 was found to occur in 29.2% of the fungal isolates investigated, varying in frequency between different regions and chestnut stands. Twenty-three haplotypes based on partial cDNA (complementary DNA) sequences of open reading frame (ORF)-A and 30 haplotypes based on partial cDNA sequences of ORF-B were identified among 47 and 56 hypovirulent fungal isolates, respectively. Phylogenetic analysis showed that all the haplotypes belonged to the Italian subtype of CHV-1 and that they were closely related to the populations of Italy, Switzerland, Croatia and Slovenia. Evidence of recombination was not found in the sequences and point mutations were the main source of diversity. Overall, this study indicated that the prevalence of CHV-1 in South Tyrol is low compared to many other central and western European populations and determined a need to actively impose biocontrol measures. Using sequence analysis, we identified some variants of interest of CHV-1 that should be studied in detail for their potential use in biocontrol.
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Affiliation(s)
- Farooq Ahmad
- Laboratory for Phytopathology, Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, Bolzano, Italy
| | - Selena Tomada
- Laboratory for Phytopathology, Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, Bolzano, Italy
| | - Thanalai Poonsiri
- Department of Pathobiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Sanja Baric
- Laboratory for Phytopathology, Faculty of Agricultural, Environmental and Food Sciences, Free University of Bozen-Bolzano, Bolzano, Italy
- Competence Centre for Plant Health, Free University of Bozen-Bolzano, Bolzano, Italy
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Li S, Ma Z, Zhang X, Cai Y, Han C, Wu X. Sixteen Novel Mycoviruses Containing Positive Single-Stranded RNA, Double-Stranded RNA, and Negative Single-Stranded RNA Genomes Co-Infect a Single Strain of Rhizoctonia zeae. J Fungi (Basel) 2023; 10:30. [PMID: 38248940 PMCID: PMC10817634 DOI: 10.3390/jof10010030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/27/2023] [Accepted: 12/29/2023] [Indexed: 01/23/2024] Open
Abstract
In the present study, sixteen novel RNA mycoviruses co-infecting a single strain of Rhizoctonia zeae (strain D40) were identified and molecularly characterized using metatranscriptome sequencing combined with a method for rapid amplification of cDNA ends. The fungal strain was isolated from diseased seedlings of sugar beet with damping-off symptoms. Based on genome analysis and phylogenetic analysis of amino acid sequences of RNA-dependent RNA polymerase, the sixteen mycoviruses associated with strain D40 contained three genome types with nine distinct lineages, including positive single-stranded RNA (Hypoviridae, Yadokariviridae, Botourmiaviridae, and Gammaflexiviridae), double-stranded RNA (Phlegiviridae, Megabirnaviridae, Megatotiviridae, and Yadonushiviridae), and negative single-stranded RNA (Tulasviridae), suggesting a complex composition of a mycoviral community in this single strain of R. zeae (strain D40). Full genome sequences of six novel mycoviruses and the nearly full-length sequences of the remaining ten novel mycoviruses were obtained. Furthermore, seven of these sixteen mycoviruses were confirmed to assemble virus particles present in the R. zeae strain D40. To the best of our knowledge, this is the first detailed study of mycoviruses infecting R. zeae.
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Affiliation(s)
| | | | | | | | | | - Xuehong Wu
- College of Plant Protection, China Agricultural University, Haidian District, Beijing 100193, China; (S.L.); (Z.M.); (X.Z.); (Y.C.); (C.H.)
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Wen Y, Qu J, Zhang H, Yang Y, Huang R, Deng J, Zhang J, Xiao Y, Li J, Zhang M, Wang G, Zhai L. Identification and Characterization of a Novel Hypovirus from the Phytopathogenic Fungus Botryosphaeria dothidea. Viruses 2023; 15:2059. [PMID: 37896836 PMCID: PMC10611357 DOI: 10.3390/v15102059] [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: 08/22/2023] [Revised: 10/02/2023] [Accepted: 10/03/2023] [Indexed: 10/29/2023] Open
Abstract
Many mycoviruses have been accurately and successfully identified in plant pathogenic fungus Botryosphaeria dothidea. This study discovered three mycoviruses from a B. dothidea strain SXD111 using high-throughput sequencing technology. A novel hypovirus was tentatively named Botryosphaeria dothidea hypovirus 1 (BdHV1/SXD111). The other two were known viruses, which we named Botryosphaeria dothidea polymycovirus 1 strain SXD111 (BdPmV1/SXD111) and Botryosphaeria dothidea partitivirus 1 strain SXD111 (BdPV1/SXD111). The genome of BdHV1/SXD111 is 11,128 nucleotides long, excluding the poly (A) tail. A papain-like cysteine protease (Pro), a UDP-glucose/sterol glucosyltransferase (UGT), an RNA-dependent RNA polyprotein (RdRp), and a helicase (Hel) were detected in the polyprotein of BdHV1/SXD111. Phylogenetic analysis showed that BdHV1/SXD111 was clustered with betahypovirus and separated from members of the other genera in the family Hypoviridae. The BdPmV1/SXD111 genome comprised five dsRNA segments with 2396, 2232, 1967, 1131, and 1060 bp lengths. Additionally, BdPV1/SXD111 harbored three dsRNA segments with 1823, 1623, and 557 bp lengths. Furthermore, the smallest dsRNA was a novel satellite component of BdPV1/SXD111. BdHV1/SXD111 could be transmitted through conidia and hyphae contact, whereas it likely has no apparent impact on the morphologies and virulence of the host fungus. Thus, this study is the first report of a betahypovirus isolated from the fungus B. dothidea. Importantly, our results significantly enhance the diversity of the B. dothidea viruses.
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Affiliation(s)
- Yongqi Wen
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Jinyue Qu
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Honglin Zhang
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Yi Yang
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Rui Huang
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Jili Deng
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Jiayu Zhang
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Yanping Xiao
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Jiali Li
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Meixin Zhang
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
| | - Guoping Wang
- Key Lab of Plant Pathology of Hubei Province, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China;
| | - Lifeng Zhai
- College of Life Science and Biotechnology, Yangtze Normal University, Chongqing 408100, China; (Y.W.); (J.Q.); (H.Z.); (Y.Y.); (R.H.); (J.D.); (J.Z.); (Y.X.); (J.L.); (M.Z.)
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Wang P, Hai D, Li Q, Xu X, Xie J, Tang L. Characterization of a novel hypovirus isolated from the phytopathogenic fungus Colletotrichum camelliae. Arch Virol 2023; 168:250. [PMID: 37691052 DOI: 10.1007/s00705-023-05878-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 08/18/2023] [Indexed: 09/12/2023]
Abstract
Some members of genus Colletotrichum are important plant pathogens. Here, we report a novel positive single-stranded RNA virus, Colletotrichum camelliae hypovirus 1 (CcHV1), from strain GXNN11-2 of Colletotrichum camelliae. The complete genome of CcHV1 is 9907 nucleotides (nt) in length and contains a single large open reading frame (ORF) from nt 352 to 9006. This ORF encodes a polyprotein with four conserved domains, namely UDP-glycosyltransferase, RNA-dependent RNA polymerase (RdRp), peptidase, and DEAD-like helicase. The CcHV1 polyprotein shares the highest similarity with Fusarium concentricum hypovirus 1. Phylogenetic analysis indicated that CcHV1 clustered with members of the genus Betahypovirus within the family Hypoviridae. This is the first report of a hypovirus in a member of the genus Colletotrichum.
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Affiliation(s)
- Pushuang Wang
- National Key Laboratory of Agricultural Microbiology, Hubei Key Laboratory of Plant Pathology, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Du Hai
- National Key Laboratory of Agricultural Microbiology, Hubei Key Laboratory of Plant Pathology, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Qili Li
- Institute of Plant Protection, Guangxi Academy of Agricultural Science, Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China Ministry of Agriculture and Rural Affairs, Guangxi Key Laboratory of Biology for Crop Diseases and Insect Pests, Nanning, 530007, Guangxi, China
| | | | - Jiatao Xie
- National Key Laboratory of Agricultural Microbiology, Hubei Key Laboratory of Plant Pathology, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Lihua Tang
- Institute of Plant Protection, Guangxi Academy of Agricultural Science, Key Laboratory of Green Prevention and Control on Fruits and Vegetables in South China Ministry of Agriculture and Rural Affairs, Guangxi Key Laboratory of Biology for Crop Diseases and Insect Pests, Nanning, 530007, Guangxi, China.
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