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 |
|
 |
Download
the full article |
