ICTV Virus Taxonomy Profile: Potyviridae 2022

Abstract

The family Potyviridae includes plant viruses with single-stranded, positive-sense RNA genomes of 8-11 kb and flexuous filamentous particles 650-950 nm long and 11-20 nm wide. Genera in the family are distinguished by the host range, genomic features and phylogeny of the member viruses. Most genomes are monopartite, but those of members of the genus Bymovirus are bipartite. Some members cause serious disease epidemics in cultivated plants. This is a summary of the International Committee on Taxonomy of Viruses (ICTV) Report on the family Potyviridae, which is available at ictv.global/report/potyviridae.

Keywords: ICTV Profile; Potyviridae; taxonomy.

Fig. 1.. (Left) Cryo-electron microscopy reconstruction of a section of a virion of turnip mosaic virus (TuMV). Depicted are the ssRNA (red), and the central globular domain (pale yellow), N-terminal arm (blue) and C-terminal region (grey) of the capsid protein. In the upper section some of the densities are cut-away. (Right) Cryo-electron micrograph of TuMV virions where the periodic organization of the helical filaments is apparent. Bar, ~500 nm. Images are courtesy of R. Cuesta and M. Valle, CIC bioGUNE, Spain, based on [7].

Fig. 2.. Schematic diagram of the genome organization of potato virus Y. VPg, virus protein genome-linked (indicated by an ellipse at the 5′-terminus); P1, protein 1 protease; HC-Pro, helper component protease; P3, protein 3; PIPO, pretty interesting Potyviridae ORF; 6K1, 6 kDa peptide 1; CI, cylindrical inclusion; 6K2, 6 kDa peptide 2; NIa-Pro, nuclear inclusion a-protease; NIb, nuclear inclusion b, RNA-directed RNA polymerase; CP, capsid protein. Arrowheads indicate cleavage sites of P1 (blue), HC-Pro (red) and NIa-Pro (black).