Biology
Barley yellow dwarf virus (BYDV) is a positive sense single-stranded RNA virus; the viron is not enveloped in a lipid coating. The virus is transmitted by aphids, and the taxonomy of the virus is based on genome organisation, serotype differences and on the primary aphid vector of each isolate.
The isolates and their major vectors (in parentheses) are:
- Subgroup I
- MAV, a less severe strain carried by aphids (Grain aphid, Sitobion avenae), SGV (Schizaphis graminum), and PAV, a less severe strain carried by aphids (bird-cherry aphid, Rhopalosiphum padi, grain aphid, S. avenae, and others including Rose-grain aphid, Metopolophium dirhodum).
- Subgroup II, called Cereal Yellow Dwarf Virus, however CYDV is now recognised as a separate species belonging to the Polerovirus genus of the Luteoviridae family
- RPV, the most severe strain carried by aphids (Bird-cherry aphid, Rhopalosiphum padi), RMV (Rhopalosiphum maidis)
Read more about this topic: Barley Yellow Dwarf
Famous quotes containing the word biology:
“Nothing can be more incorrect than the assumption one sometimes meets with, that physics has one method, chemistry another, and biology a third.”
—Thomas Henry Huxley (1825–95)
“The “control of nature” is a phrase conceived in arrogance, born of the Neanderthal age of biology and the convenience of man.”
—Rachel Carson (1907–1964)