Tobravirus

Tobravirus is a genus of viruses, in the family Virgaviridae.[1] Plants serve as natural hosts. There are three species in this genus. Diseases associated with this genus include: SBWMV: green and yellow mosaic.[1][2][3]

Tobravirus
Virus classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Kitrinoviricota
Class: Alsuviricetes
Order: Martellivirales
Family: Virgaviridae
Genus: Tobravirus

Taxonomy

The following three species are assigned to the genus:[3]

  • Pea early-browning virus
  • Pepper ringspot virus
  • Tobacco rattle virus

Structure

Viruses in the genus Tobravirus are non-enveloped, with rod-shaped geometries, and helical symmetry. The diameter is around 22 nm, with two lengths: 46-115 nm and 180–215 nm.[1][2] Genomes are linear and segmented, bipartite, positive-sense, single-stranded RNA around 26.84.5kb in total length (8600–11300 nucleotides for each length).[1][2][4]

GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
TobravirusRod-shapedHelicalNon-envelopedLinearSegmented

Life cycle

Viral replication is cytoplasmic. Entry into the host cell is achieved by penetration into the host cell. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. Translation takes place by suppression of termination. The virus exits the host cell by monopartite non-tubule guided viral movement. Plants serve as the natural host. The virus is transmitted via a vector (mechanical nematodes trichodorus and paratrichodorus). Transmission routes are vector and mechanical.[1][2]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
TobravirusPlantsNoneUnknownViral movementCytoplasmCytoplasmMechanical inoculation: nematodes

References
  1. "ICTV Online (10th) Report Virgaviridae".
  2. "Viral Zone". ExPASy. Retrieved 15 June 2015.
  3. "Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. Retrieved 14 May 2021.
  4. Index of Viruses—Tobravirus (2006). In: ICTVdB—The Universal Virus Database, version 4. Büchen-Osmond, C (Ed), Columbia University, New York, USA.
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