Oryzavirus

Oryzavirus
Virus classification
Group:	Group III (dsRNA)
Family:	Reoviridae
Subfamily:	Spinareovirinae
Genus:	Oryzavirus
Type Species
Rice ragged stunt virus

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

Order: Unassigned

• Family: Reoviridae

  • Sub-Family: Spinareovirinae

    • Genus: Oryzavirus

      • Echinochloa ragged stunt virus
      • Rice ragged stunt virus

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 (total size around 26 kb). The genome codes for 12 proteins.

Genus	Structure	Symmetry	Capsid	Genomic Arrangement	Genomic Segmentation
Oryzavirus	Icosahedral	T=13, T=2	Non-Enveloped	Linear	Segmented

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 (delphacid planthoppers). Transmission routes are vector.

Genus	Host Details	Tissue Tropism	Entry Details	Release Details	Replication Site	Assembly Site	Transmission
Oryzavirus	Plants: graminae, Oryza sativa; planthoppers	None	Viral movement; mechanical inoculation	Cell death	Cytoplasm	Cytoplasm	Delphacid planthoppers

External links

• Viralzone: Oryzavirus
• ICTV