Pathogen Profiles

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Molecular Plant Pathology - Pathogen Profiles


Barley yellow dwarf virus: Luteoviridae or Tombusviridae?

W. Allen Miller, Sijun Liu and Randy Beckett

351 Bessey Hall, Iowa State University, Ames, Iowa 50011, USA


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.
Disease 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 meetings / web sites: 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 animation: http://www.ppws.vt.edu/~sforza/tmv/bydv_aph.html
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