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.
The genus includes a single species, members of which are distinguished from all other members of the family in that they encode a very large P1 protein (83.6 kDa) containing an AlkB domain, and are also phylogenetically distinct (Susaimuthu et al., 2008).
Adams, M. J., J. F. Antoniw and F. Beaudoin (2005a). Overview and analysis of the polyprotein cleavage sites in the family Potyviridae. Mol Plant Pathol 6: 471-87. [PubMed]
A summary of this ICTV Report chapter has been published as an ICTV Virus Taxonomy Profile article in the Journal of General Virology, and should be cited when referencing this online chapter as follows:
Alice Kazuko Inoue-Nagata, Ramon Jordan, Jan Kreuze, Fan Li, Juan José López-Moya, Kristiina Mäkinen, Kazusato Ohshima, and Stephen J Wylie
The citation for this ICTV Report chapter is the summary published as Inoue-Nagata et al. (2022):
ICTV Virus Taxonomy Profile: Potyviridae 2022, Journal of General Virology, (2022) 103:001738.
Cricket paralysis virus, Israeli acute paralysis virus, and triatoma virus possess a conserved ternary motif (Asp-Asp-Phe) thought to catalyze the cleavage of VP0 into VP3 and VP4. In triatoma virus, a second identical triad exposed to the capsid interior is present in VP3. This motif is conserved in black queen cell virus, Himetobi P virus, and Plautia stali intestine virus.
Members of the Cripavirus genus exhibit the Type I intergenic untranslated region (IGR) internal ribosome entry site (IRES) structure (Jan et al. 2006). The type I IRES is characterized by the presence of a conserved consensus bulge sequence (UGAUCU/UGC), absence of a third stem loop in Pseudoknot I, and the presence of a consensus sequence (UUAC) downstream of stem loop I.
