Evidence for contemporary plant mitoviruses

Nibert, Max L.; Vong, Minh; Fugate, Karen Klotz; Debat, Humberto Julio

doi:10.1016/j.virol.2018.02.005

Cited by 96 publications

(107 citation statements)

References 66 publications

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“…Viruses belonging to Narnaviridae are divided into Narnavirus and Mitovirus genera, which are thought to differ for the site of replication: viruses belonging to Narnavirus genus replicate in cytosol whereas the majority of viruses belonging to Mitovirus genus replicate in mitochondria (Hillman and Cai, ). Viruses belonging to the latter genus were believed to be hosted only by fungi, but recent reports demonstrated that they are widespread also in plants (Nibert et al ., ). In the present work, we identified five viruses belonging to Mitovirus and four viruses belonging to Narnavirus genus.…”

Section: Resultsmentioning

confidence: 97%

Isolation, molecular characterization and virome analysis of culturable wood fungal endophytes in esca symptomatic and asymptomatic grapevine plants

Nerva

Turina

Zanzotto

et al. 2019

Environmental Microbiology

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Summary Europe is the world largest grape producer, but in recent years, the report of diseases due to infection by grapevine trunk pathogens (GTPs) is becoming one of the main constraints for viticulture. Among grapevine trunk diseases (GTDs), esca syndrome is one of the most complex, characterized by simultaneous infection of several fungi, which leads to important reduction in yield and quality. Previous characterization of fungal isolates associated with esca syndrome leads to the recognition of at least three important players: Phaeocremonium minimum, Phaemoniella chlamydospora and Fomitiporia mediterranea. Here we isolated and characterized molecularly fungal endophytes directly from field wood tissues of plants showing or not esca symptoms. In addition, to better characterize such collection, a deep RNA sequencing (100 M reads in paired‐end) to screen for mycovirus presence was performed. Thirty‐nine viral genomes were detected, 38 of which were putative new viral species; some of these viruses infected GTPs, including P. minimum and F. mediterranea. In this work, we reported for the first time a curated collection of grapevine fungal endophytes identifying the associated mycoviruses some of which could be employed in future biotechnological exploitation as biological control agents for sustainable plant protection.

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Section: Resultsmentioning

confidence: 97%

Isolation, molecular characterization and virome analysis of culturable wood fungal endophytes in esca symptomatic and asymptomatic grapevine plants

Nerva

Turina

Zanzotto

et al. 2019

Environmental Microbiology

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“…2B) and replicate in mitochondria and in the cytosol of the host cells of fungal and invertebrate hosts, respectively (the latter hosts were identified in metaviromic holobiont analyses) (14,53). Recently, the existence of plant "mitoviruses" has been reported although it is not known whether these viruses reproduce in the mitochondria (54). The "narnavirus" RdRp is also the ancestor of the RdRp of the expanding group of "ourmiaviruses" ( Fig.…”

Section: Evolution Of the 5 Major Branches Of Rna Viruses And Reconstmentioning

confidence: 99%

Origins and Evolution of the Global RNA Virome

Wolf

Kazlauskas

Iranzo

et al. 2018

mBio

427

333

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Viruses with RNA genomes dominate the eukaryotic virome, reaching enormous diversity in animals and plants. The recent advances of metaviromics prompted us to perform a detailed phylogenomic reconstruction of the evolution of the dramatically expanded global RNA virome. The only universal gene among RNA viruses is the gene encoding the RNA-dependent RNA polymerase (RdRp). We developed an iterative computational procedure that alternates the RdRp phylogenetic tree construction with refinement of the underlying multiple-sequence alignments. The resulting tree encompasses 4,617 RNA virus RdRps and consists of 5 major branches; 2 of the branches include positive-sense RNA viruses, 1 is a mix of positive-sense (ϩ) RNA and double-stranded RNA (dsRNA) viruses, and 2 consist of dsRNA and negative-sense (Ϫ) RNA viruses, respectively. This tree topology implies that dsRNA viruses evolved from ϩRNA viruses on at least two independent occasions, whereas ϪRNA viruses evolved from dsRNA viruses. Reconstruction of RNA virus evolution using the RdRp tree as the scaffold suggests that the last common ancestors of the major branches of ϩRNA viruses encoded only the RdRp and a single jelly-roll capsid protein. Subsequent evolution involved independent capture of additional genes, in particular, those encoding distinct RNA helicases, enabling replication of larger RNA genomes and facilitating virus genome expression and virus-host interactions. Phylogenomic analysis reveals extensive gene module exchange among diverse viruses and horizontal virus transfer between distantly related hosts. Although the network of evolutionary relationships within the RNA virome is bound to further expand, the present results call for a thorough reevaluation of the RNA virus taxonomy. IMPORTANCE The majority of the diverse viruses infecting eukaryotes have RNA genomes, including numerous human, animal, and plant pathogens. Recent advances of metagenomics have led to the discovery of many new groups of RNA viruses in a wide range of hosts. These findings enable a far more complete reconstruction of the evolution of RNA viruses than was attainable previously. This reconstruction reveals the relationships between different Baltimore classes of viruses and indicates extensive transfer of viruses between distantly related hosts, such as plants and animals. These results call for a major revision of the existing taxonomy of RNA viruses.

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“…In addition, all of the integrated plant mitochondrial sequences are very similar, and hence are likely monophyletic (Bruenn et al ., ). The congruence between the phylogenies of the recently described putative plant mitoviruses and those of the plant hosts implies an ancient origin, but it does not shed light on the ultimate origin of mitoviruses or transmission among plants and fungi (Nibert et al ., ).…”

Section: Lineages Shared By Plant and Fungal Virusesmentioning

confidence: 97%

“…Analyses of these transcripts support the idea that they are indeed mitoviruses of plants, rather than sequences integrated into the plant mitochondrial genomes. They were found in a wide range of plants, some of which diverged > 30 Ma (Nibert et al, 2018).…”

Section: The Mitovirusesmentioning

confidence: 99%

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Evolutionary and ecological links between plant and fungal viruses

Roossinck

2018

New Phytologist

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Contents Summary 86 I. Introduction 86 II. Lineages shared by plant and fungal viruses 87 III. Virus transmission between plants and fungi 90 IV. Additional plant virus families identified in fungi by metagenomics 91 Acknowledgements 91 References 91 SUMMARY: Plants and microorganisms have been interacting in both positive and negative ways for millions of years. They are also frequently infected with viruses that can have positive or negative impacts. A majority of virus families with members that infect fungi have counterparts that infect plants, and in some cases the phylogenetic analyses of these virus families indicate transmission between the plant and fungal kingdoms. These similarities reflect the host relationships; fungi are evolutionarily more closely related to animals than to plants but share very few viral signatures with animal viruses. The details of several of these interactions are described, and the evolutionary implications of viral cross-kingdom interactions and horizontal gene transfer are proposed.

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Evidence for contemporary plant mitoviruses

Cited by 96 publications

References 66 publications

Isolation, molecular characterization and virome analysis of culturable wood fungal endophytes in esca symptomatic and asymptomatic grapevine plants

Isolation, molecular characterization and virome analysis of culturable wood fungal endophytes in esca symptomatic and asymptomatic grapevine plants

Origins and Evolution of the Global RNA Virome

Evolutionary and ecological links between plant and fungal viruses

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