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Virus classification
Group: Group IV ((+)ssRNA)
Order: Picornavirales
Family: Secoviridae
Genus: Sequivirus
Type Species

Sequivirus is a genus of viruses in the order Picornavirales, in the family Secoviridae. Plants serve as natural hosts. There are currently three species in this genus including the type species Parsnip yellow fleck virus. Diseases associated with this genus include: PYFV: vein-yellowing, yellow flecks and yellow/green mosaic symptoms in parsnip, and ‘yellow net', followed by yellow spots and leaf distortion in celery.[1][2]


Group: ssRNA(+)



Viruses in Sequivirus are non-enveloped, with icosahedral geometries, and T=pseudo3 symmetry. The diameter is around 25-30 nm. Genomes are linear and non-segmented, around 9kb in length.[1]

Genus Structure Symmetry Capsid Genomic Arrangement Genomic Segmentation
Sequivirus Icosahedral Pseudo T=3 Non-Enveloped Linear Monopartite

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 (insects (aphids). Transmission routes are vector and mechanical.[1]

Genus Host Details Tissue Tropism Entry Details Release Details Replication Site Assembly Site Transmission
Sequivirus Plants None Viral movement; mechanical innoculation Viral movement Cytoplasm Cytoplasm Mechanical innoculation: aphids; Mechanical innoculation: Cavariella aegopodii; Mechanical innoculation: Cavariella pastinacae


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

External links[edit]