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]

Betaflexiviridae
Virus classification
(unranked): Virus
Realm: Riboviria
Phylum: incertae sedis
Order: Tymovirales
Family: Betaflexiviridae
Genera

Taxonomy

Group: ssRNA(+)

[2]

Structure

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]

GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
CarlavirusFilamentousNon-envelopedLinearMonopartite
CitrivirusFilamentousNon-envelopedLinearMonopartite
CapillovirusFilamentousNon-envelopedLinearMonopartite
VitivirusFilamentousNon-envelopedLinearMonopartite
FoveavirusFilamentousNon-envelopedLinearMonopartite
TepovirusFilamentousNon-envelopedLinearMonopartite
TrichovirusFilamentousNon-envelopedLinearMonopartite

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]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
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

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