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Lukhovitskaya N, Brown K, Hua L, Pate AE, Carr JP, Firth AE. A novel ilarvirus protein CP-RT is expressed via stop codon readthrough and suppresses RDR6-dependent RNA silencing. PLoS Pathog 2024; 20:e1012034. [PMID: 38814986 PMCID: PMC11166343 DOI: 10.1371/journal.ppat.1012034] [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: 02/09/2024] [Revised: 06/11/2024] [Accepted: 05/03/2024] [Indexed: 06/01/2024] Open
Abstract
Ilarviruses are a relatively understudied but important group of plant RNA viruses that includes a number of crop pathogens. Their genomes comprise three RNA segments encoding two replicase subunits, movement protein, coat protein (CP), and (in some ilarvirus subgroups) a protein that suppresses RNA silencing. Here we report that, in many ilarviruses, RNA3 encodes an additional protein (termed CP-RT) as a result of ribosomal readthrough of the CP stop codon into a short downstream readthrough (RT) ORF. Using asparagus virus 2 as a model, we find that CP-RT is expressed in planta where it functions as a weak suppressor of RNA silencing. CP-RT expression is essential for persistent systemic infection in leaves and shoot apical meristem. CP-RT function is dependent on a putative zinc-finger motif within RT. Replacing the asparagus virus 2 RT with the RT of an ilarvirus from a different subgroup restored the ability to establish persistent infection. These findings open up a new avenue for research on ilarvirus silencing suppression, persistent meristem invasion and vertical transmission.
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Affiliation(s)
- Nina Lukhovitskaya
- Department of Pathology, University of Cambridge, Cambridge, United Kingdom
| | - Katherine Brown
- Department of Pathology, University of Cambridge, Cambridge, United Kingdom
| | - Lei Hua
- Department of Plant Sciences, University of Cambridge, Cambridge, United Kingdom
| | - Adrienne E. Pate
- Department of Plant Sciences, University of Cambridge, Cambridge, United Kingdom
| | - John P. Carr
- Department of Plant Sciences, University of Cambridge, Cambridge, United Kingdom
| | - Andrew E. Firth
- Department of Pathology, University of Cambridge, Cambridge, United Kingdom
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Rollwage L, Maiss E, Menzel W, Hossain R, Varrelmann M. Beet mosaic virus expression of a betalain transcription factor allows visual virus tracking in Beta vulgaris. MOLECULAR PLANT PATHOLOGY 2023; 24:1319-1329. [PMID: 37410356 PMCID: PMC10502864 DOI: 10.1111/mpp.13372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 06/19/2023] [Accepted: 06/19/2023] [Indexed: 07/07/2023]
Abstract
In the field of plant virology, the usage of reverse genetic systems has been reported for multiple purposes. One is understanding virus-host interaction by labelling viral cDNA clones with fluorescent protein genes to allow visual virus tracking throughout a plant, albeit this visualization depends on technical devices. Here we report the first construction of an infectious cDNA full-length clone of beet mosaic virus (BtMV) that can be efficiently used for Agrobacterium-mediated leaf inoculation with high infection rate in Beta vulgaris, being indistinguishable from the natural virus isolate regarding symptom development and vector transmission. Furthermore, the BtMV clone was tagged with the genes for the monomeric red fluorescent protein or the Beta vulgaris BvMYB1 transcription factor, which activates the betalain biosynthesis pathway. The heterologous expression of BvMYB1 results in activation of betalain biosynthesis genes in planta, allowing visualization of the systemic BtMV spread with the naked eye as red pigmentation emerging throughout beet leaves. In the case of BtMV, the BvMYB1 marker system is stable over multiple mechanical host passages, allows qualitative as well as quantitative virus detection and offers an excellent opportunity to label viruses in plants of the order Caryophyllales, allowing an in-depth investigation of virus-host interactions on the whole plant level.
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Affiliation(s)
| | - Edgar Maiss
- Institute of Horticultural Production SystemsLeibniz University HannoverHannoverGermany
| | - Wulf Menzel
- Plant Virus DepartmentLeibniz Institute DSMZ – German Collection of Microorganisms and Cell CulturesBraunschweigGermany
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Xu T, Lei L, Fu Y, Yang X, Luo H, Chen X, Wu X, Wang Y, Jia MA. Molecular Characterization of a Novel Polerovirus Infecting Soybean in China. Viruses 2022; 14:v14071428. [PMID: 35891408 PMCID: PMC9322011 DOI: 10.3390/v14071428] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 06/24/2022] [Accepted: 06/27/2022] [Indexed: 02/01/2023] Open
Abstract
Poleroviruses are positive-sense, single-stranded viruses. In this study, we describe the identification of a novel polerovirus isolated from soybean displaying curled leaves. The complete viral genome sequence was identified using high-throughput sequencing and confirmed using rapid amplification of cDNA ends (RACE), RT-PCR and Sanger sequencing. Its genome organization is typical of the members of genus Polerovirus, containing seven putative open reading frames (ORFs). The full genome is composed of single-stranded RNA of 5822 nucleotides in length, with the highest nucleotide sequence identity (79.07% with 63% coverage) for cowpea polerovirus 2 (CPPV2). Amino acid sequence identities of the protein products between the virus and its relatives are below the threshold determined by the International Committee of Taxonomy of Viruses (ICTV) for species demarcation, and this strongly supports this virus’ status as a novel species, for which the name soybean chlorotic leafroll virus (SbCLRV) is proposed. Recombination analysis identified a recombination event in the ORF5 of the 3’ portion in the genome. Phylogenetic analyses of the genome and encoded protein sequences revealed that the new virus is closely related to phasey bean mild yellows virus, CPPV2 and siratro latent polerovirus. Subsequently, we demonstrated the infectivity of SbCLRV in Nicotiana benthamiana via infectious cDNA clone generation and agroinoculation.
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Affiliation(s)
- Tengzhi Xu
- Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang 550025, China; (T.X.); (Y.F.); (X.Y.); (H.L.); (X.C.); (X.W.)
| | - Lei Lei
- Guizhou Rapeseed Institute, Guizhou Academy of Agricultural Sciences, Guiyang 550008, China;
| | - Yong Fu
- Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang 550025, China; (T.X.); (Y.F.); (X.Y.); (H.L.); (X.C.); (X.W.)
| | - Xiaolan Yang
- Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang 550025, China; (T.X.); (Y.F.); (X.Y.); (H.L.); (X.C.); (X.W.)
| | - Hao Luo
- Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang 550025, China; (T.X.); (Y.F.); (X.Y.); (H.L.); (X.C.); (X.W.)
| | - Xiangru Chen
- Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang 550025, China; (T.X.); (Y.F.); (X.Y.); (H.L.); (X.C.); (X.W.)
| | - Xiaomao Wu
- Institute of Crop Protection, College of Agriculture, Guizhou University, Guiyang 550025, China; (T.X.); (Y.F.); (X.Y.); (H.L.); (X.C.); (X.W.)
| | - Yaqin Wang
- State Key Laboratory of Rice Biology Institute of Biotechnology, Zhejiang University, Hangzhou 310058, China
- Correspondence: (Y.W.); (M.-a.J.)
| | - Meng-ao Jia
- Guizhou Academy of Tobacco Sciences, Guiyang 550001, China
- Correspondence: (Y.W.); (M.-a.J.)
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Liu L, Ren Q, Peng B, Kang B, Wu H, Gu Q. Construction of an Agrobacterium-mediated infectious cDNA clone of melon aphid-borne yellows virus. Virus Res 2022; 315:198779. [PMID: 35427675 DOI: 10.1016/j.virusres.2022.198779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 04/09/2022] [Accepted: 04/10/2022] [Indexed: 11/25/2022]
Abstract
Melon aphid-borne yellows virus (MABYV), a member of the genus Polerovirus in the family Solemoviridae, has widely spread in recent years and cause yellowing disease on cucurbits. Here, we obtained the complete genome sequence of MABYV bottle guard (Lagenaria siceraria) isolate MABYV-KF, and constructed its infectious cDNA clone under the control of the cauliflower mosaic virus (CaMV) 35S promoter by Gibson assembly. The 5,677 nt of its genome shared more than 94.00% sequence identity with the two known MABYV isolates. The inoculation results showed that MABYV infectious cDNA clone could systemically infect bottle guard, cucumber and muskmelon plants, and cause typical yellowing symptom. The virus progeny from the infectious clone could be transmitted between bottle guard plants by aphid. Further analyses revealed that point mutations in the F-box-like motif (Pro57) and C-terminal conserved sequence (Phe211) of P0 cause low viral accumulations in systematic leaves and failed to induce symptom. The infectious clone will be potentially a tool in the investigation of viral pathogenesis, virus-virus interaction and virus-host/-vector interactions.
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Affiliation(s)
- Liming Liu
- Henan Provincial Key Laboratory of Fruit and Cucurbit Biology, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, Henan, China
| | - Qian Ren
- Henan Provincial Key Laboratory of Fruit and Cucurbit Biology, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, Henan, China
| | - Bin Peng
- Henan Provincial Key Laboratory of Fruit and Cucurbit Biology, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, Henan, China
| | - Baoshan Kang
- Henan Provincial Key Laboratory of Fruit and Cucurbit Biology, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, Henan, China
| | - Huijie Wu
- Henan Provincial Key Laboratory of Fruit and Cucurbit Biology, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, Henan, China
| | - Qinsheng Gu
- Henan Provincial Key Laboratory of Fruit and Cucurbit Biology, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, Henan, China.
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Wang Q, Zou Q, Dai Z, Hong N, Wang G, Wang L. Four Novel Mycoviruses from the Hypovirulent Botrytis cinerea SZ-2-3y Isolate from Paris polyphylla: Molecular Characterisation and Mitoviral Sequence Transboundary Entry into Plants. Viruses 2022; 14:v14010151. [PMID: 35062353 PMCID: PMC8777694 DOI: 10.3390/v14010151] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 01/09/2022] [Accepted: 01/11/2022] [Indexed: 02/04/2023] Open
Abstract
A hypovirulent SZ-2-3y strain isolated from diseased Paris polyphylla was identified as Botrytis cinerea. Interestingly, SZ-2-3y was coinfected with a mitovirus, two botouliviruses, and a 3074 nt fusarivirus, designated Botrytis cinerea fusarivirus 8 (BcFV8); it shares an 87.2% sequence identity with the previously identified Botrytis cinerea fusarivirus 6 (BcFV6). The full-length 2945 nt genome sequence of the mitovirus, termed Botrytis cinerea mitovirus 10 (BcMV10), shares a 54% sequence identity with Fusarium boothii mitovirus 1 (FbMV1), and clusters with fungus mitoviruses, plant mitoviruses and plant mitochondria; hence BcMV10 is a new Mitoviridae member. The full-length 2759 nt and 2812 nt genome sequences of the other two botouliviruses, named Botrytis cinerea botoulivirus 18 and 19 (BcBoV18 and 19), share a 40% amino acid sequence identity with RNA-dependent RNA polymerase protein (RdRp), and these are new members of the Botoulivirus genus of Botourmiaviridae. Horizontal transmission analysis showed that BcBoV18, BcBoV19 and BcFV8 are not related to hypovirulence, suggesting that BcMV10 may induce hypovirulence. Intriguingly, a partial BcMV10 sequence was detected in cucumber plants inoculated with SZ-2-3y mycelium or pXT1/BcMV10 agrobacterium. In conclusion, we identified a hypovirulent SZ-2-3y fungal strain from P. polyphylla, coinfected with four novel mycoviruses that could serve as potential biocontrol agents. Our findings provide evidence of cross-kingdom mycoviral sequence transmission.
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Affiliation(s)
- Qiong Wang
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; (Q.W.); (Q.Z.); (N.H.); (G.W.)
- Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan 430070, China
| | - Qi Zou
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; (Q.W.); (Q.Z.); (N.H.); (G.W.)
- Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhaoji Dai
- Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests, College of Plant Protection, Hainan University, Ministry of Education, Haikou 570100, China;
| | - Ni Hong
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; (Q.W.); (Q.Z.); (N.H.); (G.W.)
- Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan 430070, China
| | - Guoping Wang
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; (Q.W.); (Q.Z.); (N.H.); (G.W.)
- Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan 430070, China
| | - Liping Wang
- College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; (Q.W.); (Q.Z.); (N.H.); (G.W.)
- Key Laboratory of Plant Pathology of Hubei Province, Huazhong Agricultural University, Wuhan 430070, China
- Correspondence: ; Tel.: +86-27-8728-2130; Fax: +86-27-8738-4670
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Abraham A, Vetten HJ. Chickpea chlorotic stunt virus: a threat to cool-season food legumes. Arch Virol 2021; 167:21-30. [PMID: 34729666 DOI: 10.1007/s00705-021-05288-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Accepted: 09/16/2021] [Indexed: 11/26/2022]
Abstract
Chickpea chlorotic stunt virus (CpCSV, genus Polerovirus, family Solemoviridae), first reported in Ethiopia in 2006, causes an economically important yellowing and stunting disease in legume crops such as chickpea, faba bean, field pea, and lentil in most production areas of North Africa and Central and West Asia. Disease epidemics have been reported in Ethiopia, Syria, and Tunisia. The virus is transmitted persistently by aphids of the species Aphis craccivora and Acyrthosiphon pisum and naturally infects several legume and non-legume hosts. CpCSV exists as at least two geographic strain groups that differ in their genome sequence and serological and biological properties. In addition, a genetically divergent isolate proposed to be a member of a distinct polerovirus species has been reported from pea and faba bean in China. The ssRNA genome of the Ethiopian isolate has 5900 nucleotides, is encapsidated in isometric particles of ~ 28 nm diameter, and is suggested to have evolved by recombination of cucurbit aphid-borne yellows virus- and soybean dwarf virus-like parents. Moreover, a number of newly reported poleroviruses are suggested to have evolved by recombination between CpCSV and other parental poleroviruses. Identification of sources of resistance and further knowledge on disease epidemiology, including specific strains, vectors, and alternate hosts in different growing areas, are required for devising effective disease management strategies. Modern biotechnology tools such as next-generation sequencing, molecular markers, and agroinoculation-based resistance screening techniques can expedite future research and management efforts. This review addresses various aspects of CpCSV, including its properties, ecology, the disease it causes, management options, and future research perspectives.
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Affiliation(s)
- Adane Abraham
- Department of Biological Sciences and Biotechnology, Botswana International University of Science and Technology, Private Bag 16, Palapye, Botswana
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Pasin F, Menzel W, Daròs J. Harnessed viruses in the age of metagenomics and synthetic biology: an update on infectious clone assembly and biotechnologies of plant viruses. PLANT BIOTECHNOLOGY JOURNAL 2019; 17:1010-1026. [PMID: 30677208 PMCID: PMC6523588 DOI: 10.1111/pbi.13084] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 12/09/2018] [Accepted: 01/15/2019] [Indexed: 05/12/2023]
Abstract
Recent metagenomic studies have provided an unprecedented wealth of data, which are revolutionizing our understanding of virus diversity. A redrawn landscape highlights viruses as active players in the phytobiome, and surveys have uncovered their positive roles in environmental stress tolerance of plants. Viral infectious clones are key tools for functional characterization of known and newly identified viruses. Knowledge of viruses and their components has been instrumental for the development of modern plant molecular biology and biotechnology. In this review, we provide extensive guidelines built on current synthetic biology advances that streamline infectious clone assembly, thus lessening a major technical constraint of plant virology. The focus is on generation of infectious clones in binary T-DNA vectors, which are delivered efficiently to plants by Agrobacterium. We then summarize recent applications of plant viruses and explore emerging trends in microbiology, bacterial and human virology that, once translated to plant virology, could lead to the development of virus-based gene therapies for ad hoc engineering of plant traits. The systematic characterization of plant virus roles in the phytobiome and next-generation virus-based tools will be indispensable landmarks in the synthetic biology roadmap to better crops.
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Affiliation(s)
- Fabio Pasin
- Agricultural Biotechnology Research CenterAcademia SinicaTaipeiTaiwan
| | - Wulf Menzel
- Leibniz Institute DSMZ‐German Collection of Microorganisms and Cell CulturesBraunschweigGermany
| | - José‐Antonio Daròs
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas‐Universitat Politècnica de València)ValenciaSpain
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