This family of plant viruses is part of the Picornavirales. Many members are important plant pathogens, infecting crops like grapevine or rice (e.g. Grapevine fanleaf virus and Rice tungro spherical virus). The viruses have icosahedral, non-enveloped particles, 25-30 nm in diameter, with a positive-sensed ssRNA genome, ranging in size from 9 to 13.7 kb. Two RNA molecules, RNA1 and RNA2, are present which translate directly into a polyprotein. The viruses are transmitted by insects and nematodes.
The family has been created in 2009 to combine the closely related families of Comoviridae and Sequiviridae, as well as several unassigned virus genera, like the Torradovirus. The viruses use specialized proteins or protein domains to move through their host. See Sanfaçon et al., 2009.
For a taxonomic review of this family, see Thompson et al. (2017).
The following genera and species are currently entered under Secoviridae: