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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 11 species in this genus. Diseases associated with this genus include: stunting, severe necrosis and early plant death.^[1]^[2]^[3]

Taxonomy

The following 11 species are assigned to the genus:^[3]

Structure and genome

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]^[4]

Genus	Structure	Symmetry	Capsid	Genomic arrangement	Genomic segmentation
Nanovirus	Icosahedral	T=1	Non-enveloped	Circular	Segmented

Life cycle

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]