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Virus classification
Group: Group IV ((+)ssRNA)
Family: Virgaviridae
Genus: Tobravirus
Type Species

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


Group: ssRNA(+)



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][3]

Genus Structure Symmetry Capsid Genomic arrangement Genomic segmentation
Tobravirus Rod-shaped Helical Non-enveloped Linear Segmented

Life cycle[edit]

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]

Genus Host details Tissue tropism Entry details Release details Replication site Assembly site Transmission
Tobravirus Plants None Unknown Viral movement Cytoplasm Cytoplasm Mechanical inoculation: nematodes


  1. ^ a b c d e f "ICTV Online (10th) Report Virgaviridae". 
  2. ^ a b c d "Viral Zone". ExPASy. Retrieved 15 June 2015. 
  3. ^ Index of Viruses—Tobravirus (2006). In: ICTVdB—The Universal Virus Database, version 4. Büchen-Osmond, C (Ed), Columbia University, New York, USA.

External links[edit]