Genus Polerovirus
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Type Species |
Potato leafroll virus |
(PLRV) |
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; S20w 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
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Beet mild yellowing virus |
[X83110] |
(BMYV) |
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Beet western yellows virus (89) |
[X13062, X13063] |
(BWYV) |
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(Malva yellows virus) |
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(Turnip mild yellows virus) |
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Cereal yellow dwarf virus - RPV (32) |
[Y07496] |
(CYDV-RPV) |
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Cucurbit aphid-borne yellows virus |
[X76931] |
(CABYV) |
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Potato leafroll virus (291) |
[X14600, X74789, D13954, |
(PLRV) |
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(Solanum yellows virus) |
D00734, D13953, D00733, |
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(Tomato yellow top virus) |
D00530, X14600] |
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Tentative Species in the Genus
None reported.
