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Virus classification
Group: Group IV ((+)ssRNA)
Family: Potyviridae
Genus: Ipomovirus
Type Species

Ipomovirus is a genus of viruses, in the family Potyviridae. There are currently six species in this genus including the type species Sweet potato mild mottle virus.[1][2] They infect plants and are transmitted by whiteflies (Bemisia tabaci). The name of the genus is derived from Ipomoea - the generic name of sweet potato.


Group: ssRNA(+)



Viruses in Ipomovirus are non-enveloped, with flexuous and filamentous geometries. The diameter is around 12-15 nm, and may have a variety of lengths depending on the species (200-300 nanometers (nm): 500-600 nm: 650-900 nm).[1] The capsid has helical symmetry with a pitch of 3.4 nm. They induce characteristic inclusion bodies (pinwheels) within infected plant cells.

Genus Structure Symmetry Capsid Genomic arrangement Genomic segmentation
Ipomovirus Filamentous Helical Non-enveloped Linear Segmented

Life cycle[edit]

Viral replication is cytoplasmic. 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. The virus exits the host cell by tubule-guided viral movement. Plants serve as the natural host. The virus is transmitted via a vector (white fly). Transmission routes are vector and mechanical.[1]

Genus Host details Tissue tropism Entry details Release details Replication site Assembly site Transmission
Ipomovirus Plants None Viral movement; mechanical inoculation Viral movement Cytoplasm Cytoplasm Mechanical inoculation: white fly


The genome is a monpartite linear, single stranded RNA genome of positive polarity about 10-11 kilobases in length. The 3’ terminus has a poly (A) tract and the 5’ terminus has a genome linked protein (VPg).[1]

It encodes a single polypeptide with a predicted molecular weight of 390 kiloDaltons (kDa) which is cleaved into ~10 proteins. In 5'-3' order these proteins are

There may be some variation in the number of the proteins depending on the species.


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

External links[edit]