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 the virus bellflower veinal mottle virus in a single species, Bevemovirus campanulae; 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.
Triticum mosaic virus (TriMV) is transmitted by the wheat curl mite (Aceria tosichella) and has an unusually long 5´-untranslated region. Vectors are unknown for the other members of the genus.
Virions of sugarcane streak mosaic virus (SCSMV) are flexuous filaments 890 nm×15 nm in size.
Ipomoviruses are distinguished from members of other genera by their mode of transmission being by whiteflies, and by their separate branching on phylogenetic analyses.
Virions are flexuous filaments 800–950 nm long.
Compared with other viruses in the family, members of the genus Bymovirus are distinct in having a divided (bipartite) genome and in being transmitted by the root-infecting parasite, Polymyxa graminis (Plasmodiophorales), a fungoid protist.
