| Nanovirus | |
|---|---|
 | |
| Faba bean necrotic yellows virus (FBNYV) | |
Virus classification  | |
| (unranked): | Virus |
| Realm: | Monodnaviria |
| Kingdom: | Shotokuvirae |
| Phylum: | Cressdnaviricota |
| Class: | Arfiviricetes |
| Order: | Mulpavirales |
| Family: | Nanoviridae |
| Genus: | Nanovirus |
Nanovirus is a genus of viruses, in the family Nanoviridae . [1] Legume plants serve as natural hosts. There are 12 species in this genus. Diseases associated with this genus include: stunting, severe necrosis and early plant death. [1] [2] [3]
The genus contains the following species, listed by scientific name and followed by the exemplar virus of the species: [3] [4]
Virions in the genus Nanovirus are non-enveloped, with icosahedral and round geometries, and T=1 symmetry. The diameter is around 18-19 nm.
The genome is multipartite, and the genome components (6 or 8, depending on the genus) are circular, around 1kb in length, essentially carry only one gene, and are individually encapsidated forming small icosahedral virions (18–20 nm). [2] [5]
| Genus | Structure | Symmetry | Capsid | Genomic arrangement | Genomic segmentation |
|---|---|---|---|---|---|
| Nanovirus | Icosahedral | T=1 | Non-enveloped | Circular | Segmented |
Viral replication is nuclear. Entry into the host cell is achieved by penetration into the host cell. Replication follows the ssDNA rolling circle model. DNA-templated transcription is the method of transcription. The virus exits the host cell by nuclear pore export, and tubule-guided viral movement. Legume plants serve as the natural host. The virus is transmitted via a vector (the virus does not replicate in this). Transmission routes are vector. [1] [2]
| Genus | Host details | Tissue tropism | Entry details | Release details | Replication site | Assembly site | Transmission |
|---|---|---|---|---|---|---|---|
| Nanovirus | Plants: legumes | Phloem | Viral movement; mechanical inoculation | Secretion; viral movement | Nucleus | Nucleus | Aphids |