Fabavirus

Fabavirus is a genus of plant viruses in the order Picornavirales, in the family Secoviridae, in the subfamily Comovirinae. Plants serve as natural hosts. There are 13 species in this genus.

Taxonomy

The genus contains the following species, listed by scientific name and followed by the exemplar virus of the species:Fabavirus alphaviciae, Broad bean wilt virus 1Fabavirus avii, Cherry virus FFabavirus betaviciae, Broad bean wilt virus 2Fabavirus betavitis, Grapevine secovirusFabavirus cirsii, Cirsium virus AFabavirus cucurbitaceae, Cucurbit mild mosaic virusFabavirus gentianae, Gentian mosaic virusFabavirus gynostemmae, Gynostemma pentaphyllum secovirusFabavirus lamii, Lamium mild mosaic virusFabavirus persicae, Peach leaf pitting-associated virus AFabavirus pruni, Prunus virus FFabavirus vitis, Grapevine fabavirusFabavirus yuccae, Yucca gloriosa secovirus

Structure

Viruses in Fabavirus are non-enveloped, with icosahedral geometries, and T=pseudo3 symmetry. The diameter is around 28-30 nm. Genomes are linear and segmented, bipartite, around 23.4kb in length.

Genus	Structure	Symmetry	Capsid	Genomic arrangement	Genomic segmentation
Fabavirus	Icosahedral	Pseudo T=3	Non-enveloped	Linear	Segmented

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. The virus is transmitted via a vector. Transmission routes are vector and mechanical.

Genus	Host details	Tissue tropism	Entry details	Release details	Replication site	Assembly site	Transmission
Fabavirus	Plants	-	Viral movement; mechanical inoculation	Viral movement	Cytoplasm	Cytoplasm	Mechanical inoculation: aphids

History

Proposed in 1987, as the Fabavirus group, it was originally unassigned but given genus status in 1993 as a member of the Comoviridae, of the Picornavirales in 2008, and reached its current taxonomic status in 2009. There are seven species. The genus is named after the broad bean.