Oryzavirus


Oryzavirus is a genus of viruses, in the family Reoviridae, in the subfamily Spinareovirinae. There are currently only two species in this genus including the type species Rice ragged stunt virus. Diseases associated with this genus include: RRSV: stunting, enations on veins of leaves and leaf sheaths, ragged leaves, flower suppression; FDV: Fiji disease, with severe stunting, deformation and death.

Taxonomy

Group: dsRNA

Structure

Viruses in Oryzavirus are non-enveloped, with icosahedral and Round geometries, and T=13, T=2 symmetry. The diameter is around 70 nm. Genomes are linear and segmented, segments are around 1162 to 3849 base pairs. The genome codes for 12 proteins.
GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
OryzavirusIcosahedralT=13, T=2Non-envelopedLinearSegmented

Life cycle

Viral replication is cytoplasmic. Entry into the host cell is achieved by penetration into the host cell. Replication follows the double-stranded RNA virus replication model. Double-stranded RNA virus transcription is the method of transcription. The virus exits the host cell by monopartite non-tubule guided viral movement.
The virus is transmitted via a vector. Transmission routes are vector.
GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
OryzavirusPlants: graminae, Oryza sativa; planthoppers-Viral movement; mechanical inoculationCell deathCytoplasmCytoplasmDelphacid planthoppers