Parsnip yellow fleck and rice tungro spherical viruses resemble picornaviruses and represent two genera in a proposed new plant picornavirus family (Sequiviridae)

Reavy, B.; Mayo, M. A.; Turnbull-Ross, A. D.; Murant, A. F.

doi:10.1007/bf01378644

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…The same was observed for LeCV1 (Svanella-Dumas et al 2018). These observations are consistent with the notion that waikaviruses are not mechanically sap-transmissible because they are confined to phloem tissue (Reavy et al 1993). On the other hand, variants JG1-A and JG1-B were readily transmitted from the JG1 plant and induced systemic mosaic and star chlorosis symptoms on inoculated lettuce (cv.…”

Section: Comparative Host Range Analysis For Various Sequiviral Isolatessupporting

confidence: 91%

“…For the Waikavirus found in the cultivated JG1 lettuce, its genome characterization and phylogenetic analysis show that it belongs to a new species, for which the name lettuce waikavirus 1 is proposed. The unsuccessful results at mechanical transmission suggest that like RTSV, this new virus could be confined to phloem tissues and not mechanically transmissible (Reavy et al 1993). The biology and epidemiology of waikaviruses remain poorly understood, likely in part due to their phloem restriction and reliance on specific arthropod vectors for efficient transmission (Reddick et al 1997).…”

Section: Discussionmentioning

confidence: 99%

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Molecular and Biological Characterization of Novel and Known Family Secoviridae Members Infecting Lettuce

et al. 2023

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High-throughput sequencing of two lettuces showing virus-like symptoms in France provided evidence of infection by members of the Secoviridae family. One plant (JG1) had a complex mixed infection that involved, among others, a novel Waikavirus (lettuce waikavirus 1) and two isolates of a sequivirus related to lettuce mottle virus (LeMoV). The second lettuce plant (JG2) was single infected by LeMoV. Complete genomic sequences were obtained for all four isolates and, in addition, near complete genome sequences were obtained for other LeMoV or LeMoV-related isolates (from French cultivated and wild lettuces, and from a Brazilian cultivated lettuce) and for two isolates of another Asteraceae-infecting sequivirus, dandelion yellow mosaic virus (DaYMV). Analysis of these genomic sequences allows to propose tentative genome organization for the various viruses and to clarify their phylogenetic relationships. Sequence and host range comparisons point to significant differences between the two sequivirus isolates identified in the JG1 plant and LeMoV isolates from France and Brazil, suggesting they belong to a novel species for which the name lettuce star mosaic virus is proposed.

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Section: Comparative Host Range Analysis For Various Sequiviral Isolatessupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Molecular and Biological Characterization of Novel and Known Family Secoviridae Members Infecting Lettuce

et al. 2023

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“…HaRNAV is most similar to viruses belonging to the Sequiviridae , which are 30 nm in diameter, have a genome size ranging from 9 to 12 kb, and have at least three capsid proteins ranging from 22.5 to 34 kDa (Hemida and Murant 1989, Hemida et al 1989, Reavy et al 1993). In addition, the genomes of some sequiviruses are not polyadenylated (Turnbull‐Ross et al 1992, Mayo et al 1995), as the results of the poly(A) purification experiment suggest for HaRNAV.…”

Section: Discussionmentioning

confidence: 99%

CHARACTERIZATION OF HaRNAV, A SINGLE‐STRANDED RNA VIRUS CAUSING LYSIS OF HETEROSIGMA AKASHIWO (RAPHIDOPHYCEAE)¹

Tai

Lawrence

Lang

et al. 2003

Journal of Phycology

116

119

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HaRNAV, a novel virus that infects the toxic bloom‐forming alga Heterosigma akashiwo (Hada) Hada ex Hada et Chihara, was characterized based on morphology, pathology, nucleic acid type, structural proteins, and the range of host strains that it infects. HaRNAV is a 25‐nm single‐stranded RNA (ssRNA) virus with a genome size of approximately 9100 nucleotides. This is the first report of an ssRNA virus that causes lysis of a phytoplankton species. The virus particle is sensitive to chloroform and contains at least five structural proteins ranging in apparent size from 24 to 34 kDa. HaRNAV infection causes swelling of the endoplasmic reticulum and progeny virus particles assemble in the cytoplasm of the host, frequently in crystalline arrays. The infectivity of HaRNAV was tested against 15 strains of H. akashiwo isolated from Japanese waters, the Northeast Pacific, and the Northwest Atlantic. HaRNAV caused lysis of three strains from the Northeast Pacific and two strains from Japan but none from the Northwest Atlantic. The characterization of HaRNAV demonstrates that HaRNAV is a novel type of phytoplankton virus but has some similarities with plant viruses belonging to the Sequiviridae and to other known ssRNA viruses. Further genomic analysis, however, is necessary to determine any phylogenetic relationships. The discovery of HaRNAV emphasizes the diversity of H. akashiwo viral pathogens and, more importantly, algal–virus pathogens and the complexity of virus–host interactions in the environment.

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Secoviridae: The Amalgamation of the Families Sequiviridae and Comoviridae

Sanfaçon¹

2009

Encyclopedia of Life Sciences

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Several plant viruses share features with animal and human viruses of the family Picornaviridae , including a conserved structure of both the virus particle and the viral genome, expressing viral proteins by proteolytic cleavage of large polyproteins and encoding replication proteins with conserved sequence motifs. Members of the family Comoviridae were originally described as the only plant picorna‐like viruses. Other plant picorna‐like viruses were later discovered and classified in the family Sequiviridae . Sequiviridae and Comoviridae are related to each other in phylogenetic studies and share the common property of encoding specialized proteins to enable their movement in the plant. Recently, it was proposed to regroup plant picorna‐like viruses into a single family termed ‘secoviridae’. The proposed family amalgamates the families Comoviridae and Sequiviridae , and incorporates other plant picorna‐like viruses currently classified in the genera Sadwavirus and Cheravirus , and the proposed genus ‘ Torradovirus ’. Key concepts: Many plant viruses are related to the animal and human picornaviridae and to other picorna‐like viruses infecting algae and arthropods. A recent update in the taxonomy of plant picorna‐like viruses has lead to the creation of the family ‘secoviridae’ which amalgamates the families Comoviridae and Sequiviridae as well as the existing genera Cheravirus , Sequivirus and the proposed genus ‘torradovirus’. Secoviridae share many common characteristics including having both similar virus particle structures and genomic organizations, and requiring a specialized protein to facilitate their movement within the host plant. Secoviridae produce their proteins in the form of large polyproteins that are cleaved at specific sites by a viral proteinase. Replication of the viral RNA occurs in large protein complexes in association with intracellular membranes from the host. Plant cells infected with secoviridae generally display tubular structures that are composed of the viral movement protein, contain virus‐like particles and traverse the cell wall. These tubular structures are probably involved in the movement of the virus from cell to cell. Secoviridae can be transmitted through seeds and pollen or with the help of nematode or arthropod vectors and their spread in the field is largely dependent on their mode of transmission.

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Parsnip yellow fleck and rice tungro spherical viruses resemble picornaviruses and represent two genera in a proposed new plant picornavirus family (Sequiviridae)

Abstract: Parsnip yellow fleck and rice tungro spherical viruses, with monopartite ss RNA genomes, resemble picornaviruses in the polymerase and NTP-binding domains of their encoded polyproteins. Though in separate genera, they may comprise a new family.

Cited by 9 publications

References 11 publications

Molecular and Biological Characterization of Novel and Known Family Secoviridae Members Infecting Lettuce

Molecular and Biological Characterization of Novel and Known Family Secoviridae Members Infecting Lettuce

CHARACTERIZATION OF HaRNAV, A SINGLE‐STRANDED RNA VIRUS CAUSING LYSIS OF HETEROSIGMA AKASHIWO (RAPHIDOPHYCEAE)¹

Secoviridae: The Amalgamation of the Families Sequiviridae and Comoviridae

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Parsnip yellow fleck and rice tungro spherical viruses resemble picornaviruses and represent two genera in a proposed new plant picornavirus family (Sequiviridae)

Abstract: Parsnip yellow fleck and rice tungro spherical viruses, with monopartite ss RNA genomes, resemble picornaviruses in the polymerase and NTP-binding domains of their encoded polyproteins. Though in separate genera, they may comprise a new family.

Cited by 9 publications

References 11 publications

Molecular and Biological Characterization of Novel and Known Family Secoviridae Members Infecting Lettuce

Molecular and Biological Characterization of Novel and Known Family Secoviridae Members Infecting Lettuce

CHARACTERIZATION OF HaRNAV, A SINGLE‐STRANDED RNA VIRUS CAUSING LYSIS OF HETEROSIGMA AKASHIWO (RAPHIDOPHYCEAE)1

Secoviridae: The Amalgamation of the Families Sequiviridae and Comoviridae

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CHARACTERIZATION OF HaRNAV, A SINGLE‐STRANDED RNA VIRUS CAUSING LYSIS OF HETEROSIGMA AKASHIWO (RAPHIDOPHYCEAE)¹