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]
Genome map of species Faba bean necrotic yellows virus (FBNYV) showing 8 segments.
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]
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
References
^ abc"ICTV Report Nanoviridae".
^ abc"Viral Zone". ExPASy. Retrieved 15 June 2015.
^ ab"Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. Retrieved 12 May 2021.
^Grigoras, Ioana (May 2014). "Genome diversity and evidence of recombination and reassortment in nanoviruses from Europe". Journal of General Virology. 95: 1178–1191. doi:10.1099/vir.0.063115-0. PMID 24515973.
