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Nanovirus is a genus of viruses, in the family Nanoviridae. Legume plants serve as natural hosts. There are currently six species in this genus including the type species Subterranean clover stunt virus. Diseases associated with this genus include: stunting, severe necrosis and early plant death.[1][2]

Virus classification
Group II (ssDNA)
Type Species



Viruses in 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 genera) are circular, around 1kb in length, essentially carry only one gene, and are individually encapsidated forming small icosahedral virions (18–20 nm).[1][3]

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

Life cycleEdit

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]

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


  1. ^ a b c "Viral Zone". ExPASy. Retrieved 15 June 2015.
  2. ^ a b ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015.
  3. ^ 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.

External linksEdit