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Electron micrograph of narcissus mosaic virus (NMV) filamentous virions
Virus classification Edit this classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Kitrinoviricota
Class: Alsuviricetes
Order: Tymovirales
Family: Alphaflexiviridae

Alphaflexiviridae is a family of viruses in the order Tymovirales.[1] Plants and fungi serve as natural hosts. There are 65 species in this family, assigned to six genera.[2][3] Diseases associated with this family include: mosaic and ringspot symptoms.[3][4]


The following genera are recognized:[2]


Viruses in the genus Alphaflexiviridae are non-enveloped, with flexuous and filamentous geometries. The diameter is around 12-13 nm. Genomes are linear, around 5.4-9kb in length. The genome codes for 1 to 6 proteins.[3][4]

Life cycle[edit]

Viral replication is cytoplasmic, and is lysogenic. Entry into the host cell is achieved by penetration into the host cell. Replication follows the positive stranded RNA virus replication model. Positive stranded RNA virus transcription is the method of transcription. Translation takes place by leaky scanning. The virus exits the host cell by tripartite non-tubule guided viral movement. Plants and fungi serve as the natural host. The virus is transmitted via a vector (insects). Transmission routes are vector and mechanical.[3][4]


  1. ^ Kreuze, JF; Vaira, AM; Menzel, W; Candresse, T; Zavriev, SK; Hammond, J; Hyun Ryu, K; ICTV Report Consortium (July 2020). "ICTV Virus Taxonomy Profile: Alphaflexiviridae". The Journal of General Virology. 101 (7): 699–700. doi:10.1099/jgv.0.001436. PMC 7660234. PMID 32525472.
  2. ^ a b "Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. Retrieved 15 May 2021.
  3. ^ a b c d "ICTV Report Alphaflexiviridae".
  4. ^ a b c "Viral Zone". ExPASy. Retrieved 12 June 2015.

External links[edit]