Genus Polerovirus

Distinguishing Features

Particles are thought to have 180 subunits arranged in a T = 3 icosahedron. Virion buoyant density in CsCl is 1.39-1.42; S_20w is 115-127S. Genome size is from 5600  nts (CYDV-RPV) to 5882  nts (PLRV). A VPg is linked to the genome RNA of PLRV and CYDV-RPV, presumably at the 5-end. Particles of some strains of CYDV-RPV contain a 322  nts satellite RNA. Poleroviruses and enamoviruses are distinguished from luteoviruses by genome features. The polerovirus genome has a VPg, an ORF0 and a non-coding region between ORF2 and ORF3 of about 200  nts. Frameshift from ORF1 into ORF2 occurs upstream of the termination of ORF1. Polerovirus genomes differ from those of enamoviruses in that ORF4 is present within ORF3 and ORF5 is about 1400  nts. A very recent paper provides evidence for a small ORF6 near the 3-end of the PLRV and CABYV genomes. Poleroviruses may invade non-phloem tissue to a limited extent in plants co-infected with other viruses, such as potyviruses.

List of Species Demarcation Criteria in the Genus

See above “List of Species Demarcation Criteria in the Family”.

List of Species in the Genus

Official virus species names are in italics. Tentative virus species names, alternative names ( ), strains or serotypes are not italicized. Virus names, CMI/AAB description numbers ( ), genome sequence accession numbers [ ], and assigned abbreviations ( ) are:

Species in the Genus

Tentative Species in the Genus

None reported.