Similar to cheraviruses, torradoviruses have a bipartite genome with two open reading frames in RNA2 and three capsid proteins.
See discussion under family description.
Members of the genus Cheravirus have bipartite genomes and encode three capsid proteins and are transmitted by nematodes and through seeds.
See discussion under family description.
Marc Fuchs, Jean-Michel Hily, Karel Petrzik, Hélène Sanfaçon, Jeremy R. Thompson, René van der Vlugt and Thierry Wetzel
The citation for this ICTV Report chapter is the summary published as Fuchs M, Hily JM, Petrzik K, Sanfaçon H, Thompson JR, van der Vlugt R, Wetzel T. and ICTV Report Consortium (2022):
ICTV Virus Taxonomy Profile: Secoviridae 2022, Journal of General Virology (2022) 103:001807
The genus includes a single species, Bellflower veinal mottle virus; members of this species, like macluraviruses and arepaviruses, lack the P1 region present in most potyvirids. The HC-Pro lacks the conserved potyvirus aphid transmission motifs R/KITC and PTK. Isolates of bellflower veinal mottle virus share low (22–27%) nucleotide and amino acid sequence identities to macluraviruses.
The largest genus in the family contains viruses transmitted by aphids in a non-persistent manner.
Virions are flexuous filaments, 680–900 nm long and 11–13 nm wide, with helical symmetry and a pitch of about 3.4 nm. Particles of some viruses are longer in the presence of divalent cations than in the presence of EDTA.
