Tombusviridae

Tombusviridae is a family of single-stranded positive sense RNA plant viruses. The family contains 19 genera in 3 subfamilies. The name is derived from Tomato bushy stunt virus (TBSV).

==Genome== thumb|Tombusviridae genome map All viruses in the family have a non-segmented (monopartite) linear genome, with the exception of Dianthoviruses, whose genome is bipartite. The genome is approximately 4.6–4.8kb in length, lacks a 5' cap and a poly(A) tail, and it encodes 4–6 ORFs. The polymerase encodes an amber stop codon which is the site of a readthrough event within ORF1, producing two products necessary for replication. There is no helicase encoded by the virus.