|
Showing 1 - 2 of
2 matches in All Departments
It has been known for a long time that the majority of plant
viruses contain RNA and in the past decade and a half it has been
realized that many have genomes consisting of three molecules of
single-stranded RNA with positive polarity. Among these are viruses
belonging to four groups recognized by the International Committee
for Virus Taxonomy: the Bromovirus and Cucumovirus groups whose
genomes are encapsi dated in small icosahedral particles or the
Ilarvirus and alfalfa mosaic virus groups with spheroidal or
bacilliform particles. In addition to their tripartite genomes,
these viruses share a number of other properties and it has been
proposed that they should perhaps be grouped in a single virus
family for which the name Tricornaviridae has been suggested, the
tri indicating the tripartite nature of the genome, the co
emphasizing the cooperation of the three genome parts required to
initiate infection, and the rna indicating that the genome is
composed of RNA. Viruses of this "family" are less uniform in their
biological proper ties. A number of them are widespread, causing
very destructive plant diseases. Viruses such as those of cucumber
mosaic and alfalfa mosaic have very extensive host ranges and are
responsible for serious crop losses in many parts of the world.
Others such as prunus necrotic ringspot or prune dwarf viruses are
more restricted in their host ranges but never theless infect
important perennial hosts such as stone fruits and reduce
productivity considerably."
The Fifth Report of the International Committee on Taxonomy of
Viruses (ICTV), summarizes the proceedings and decisions reached by
the ICTV at its meetings held at the International Congresses of
Virology in Sendai (1984), Edmonton (1987) and Berlin (1990). This
report has been organized in the same way as the previous ones
(Wildy, 1971; Fenner, 1976; Matthews, 1979; 1982), yet it
encompasses many more families and groups of viruses than previous
reports, and it includes new tables, diagrams and keys. The
officers and members of the ICTV study groups from 1984 to 1990 are
listed, as the current ICTV statutes and rules of nomenclature.
Information on the format for submission of new taxonomic proposals
to the ICTV is also provided. Since the Fourth Report of the ICTV
(1982), 19 new virus families and groups have been described. This
report includes 2,430 viruses belonging to 73 families or groups,
as well as virus satellites and viroids descriptions, but it does
not include descriptions not approved by the ICTV. It now will be
possible to publish such preliminary, and in some cases
controversial, descriptions in the Virology Division pages of the
Archives of Virology --this will allow virologists to carry on the
kind of interim dialogue that is necessary for arriving at broad
agreement on taxonomic matters.
|
You may like...
Loot
Nadine Gordimer
Paperback
(2)
R398
R330
Discovery Miles 3 300
Loot
Nadine Gordimer
Paperback
(2)
R398
R330
Discovery Miles 3 300
|