Virus classification
Group: Group IV ((+)ssRNA)
Order: Tymovirales
Family: Betaflexiviridae

Betaflexiviridae is a family of viruses in the order Tymovirales. Plants and fungi serve as natural hosts. There are currently 87 species in this family, divided among 7 genera. Diseases associated with this family include: mosaic and ringspot symptoms.[1][2]


Group: ssRNA(+)



Viruses in Betaflexiviridae are non-enveloped, with flexuous and Filamentous geometries. The diameter is around 12-13 nm. Genomes are linear, around 6.5-9kb in length. The genome codes for 2 to 6 proteins.[1]

Genus Structure Symmetry Capsid Genomic Arrangement Genomic Segmentation

Life Cycle

Viral replication is cytoplasmic, and is lysogenic. 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. The virus exits the host cell by tripartite non-tubule guided viral movement, and tubule-guided viral movement. Plants and fungi serve as the natural host. The virus is transmitted via a vector (insects). Transmission routes are vector and mechanical.[1]

Genus Host Details Tissue Tropism Entry Details Release Details Replication Site Assembly Site Transmission
CarlavirusPlantsNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmMechanical: insects
CitrivirusPlantsNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmUnknown
CapillovirusPome fruits; citrus; pearNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmMechanical: seeds
VitivirusPlantsNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmMechanical inoculation: pseudococcid mealybugs; Mechanical inoculation: aphids
FoveavirusPlantsNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmGrafting
TepovirusPome fruits; citrus; pearNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmGrafting; propagating material
TrichovirusPome fruits; citrus; pearNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmGrafting; propagating material


  1. 1 2 3 "Viral Zone". ExPASy. Retrieved 12 June 2015.
  2. 1 2 ICTV. "Virus Taxonomy: 2014 Release". Retrieved 12 June 2015.

External links

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