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
||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.
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.
||Most grasses. Most important in
oats, barley and wheat. Also infects maize and rice.
||Yellowing and dwarfing in barley,
stunting in wheat; reddening, yellowing and blasting in oats. Some
isolates cause leaf notching and curling.
||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.
Aphid transmission animation: http://www.ppws.vt.edu/~sforza/tmv/bydv_aph.html
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