Secoviridae

Secoviridae is a family of viruses in the order "Picornavirales". Plants serve as natural hosts. There are currently 86 species in this family, divided among 8 genera or not assigned to a genus. The family was created in 2009 with the grouping of families "Sequiviridae", now dissolved, and "Comoviridae", now subfamily "Comovirinae", along with the then unassigned genera "Cheravirus", "Sadwavirus", and "Torradovirus".
Structure.
Viruses in "Secoviridae" are non-enveloped, with icosahedral geometries, and T=pseudo3 symmetry. The diameter is around 25-30 nm. Genomes are linear and segmented, bipartite, around 24-7kb in length.
Life cycle.
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. Transmission routes are mechanical.
Taxonomy.
Group: ssRNA(+)
Evolution.
The subfamily "Comovirinae" evolved ~1,000 years ago with extant species diversifying between 50 and 250 years ago. This time period coincides with the intensification of agricultural practices in industrial societies.
The mutation rate has been estimated to be 9.29×10−3 to 2.74×10−3 subs/site/year.