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- Title
Barley yellow dwarf virus: Luteoviridae or Tombusviridae?
- Authors
Miller, W. Allen; Liu, Sijun; Beckett, Randy
- Abstract
Barley yellow dwarf virus (BYDV), the most economically important virus of small grains, features highly specialised relationships with its aphid vectors, a plethora of novel translation mechanisms mediated by long-distance RNA interactions, and an ambiguous taxonomic status. The structural and movement proteins of BYDV that confer aphid transmission and phloem-limitation properties resemble those of the Luteoviridae, the family in which BYDV is classified. In contrast, many genes and cis-acting signals involved in replication and gene expression most closely resemble those of the Tombusviridae. Taxonomy: BYDV is in genus Luteovirus, family Luteoviridae. BYDV includes at least two serotypes or viruses: BYDV-PAV and BYDV-MAV. The former BYDV-RPV is now Cereal yellow dwarf virus-RPV (CYDV-RPV). CYDV is in genus Polerovirus, family Luteoviridae. Genus Luteovirus shares many features with family Tombusviridae. Physical properties: ∼25 nm icosahedral (T = 3) virions. One major (22 kDa) and one minor (50-55 kDa) coat protein. 5.6-5.8 kb positive sense RNA genome with no 5′-cap and no poly(A) tail. Host range: Most grasses. Most important in oats, barley and wheat. Also infects maize and rice. Symptoms: Yellowing and dwarfing in barley, stunting in wheat; reddening, yellowing and blasting in oats. Some isolates cause leaf notching and curling. Key attractions: Model for the study of circulative transmission of aphid-transmitted viruses. Plethora of unusual translation mechanisms. Evidence of recombination in recent evolutionary history creates taxonomic ambiguity. Economically important virus of wheat, barley and oats, worldwide. Useful websites/meetings: International symposium: 'Barley Yellow Dwarf Disease: Recent Advances and Future Strategies', CIMMYT, El Batan, Mexico, 1-5 September 2002, http://www.cimmyt.cgiar.org/Research/wheat/Conf_BYD_02/ invitation.htm http://www.cimmyt.org/Research/wheat/BYDVNEWS/htm/ BYDVNEWS.htm Aphid transmission...
- Subjects
BARLEY yellow dwarf viruses; PLANT genetics; APHIDS
- Publication
Molecular Plant Pathology, 2002, Vol 3, Issue 4, p177
- ISSN
1464-6722
- Publication type
Article
- DOI
10.1046/j.1364-3703.2002.00112.x