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00.018.0.02. Fabavirus
Cite this publication as: ICTVdB Management (2006).
00.018.0.02. Fabavirus. In: ICTVdB - The Universal Virus Database,
version 4. Büchen-Osmond, C. (Ed), Columbia University, New York, USA
Cite this site as: ICTVdB - The Universal Virus Database, version 4.
http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/
This is a description of a
plant virus at the genus level.
ICTVdB Virus Code: 00.018.0.02. Virus accession number:
018002GE. Obsolete virus code: 18.0.2.; superceded accession number: 18020000.
NCBI Taxon Identifier NCBI Taxonomy ID:
12269.
Name, Synonyms and Lineage
Synonym(s): Broad
bean wilt virus group. Virus is of the family
00.018.
Comoviridae.
Virions consist of a capsid. Virus capsid is not
enveloped, round with icosahedral
symmetry. The isometric capsid has a diameter of
(22-)30(-32) nm. Capsids appear hexagonal in outline. The capsomer
arrangement is not obvious. Virus preparations contain more than one particle
component.
Capsids all have the same appearance.
Electron microscopic preparation and references: Virus preparation
contains many virions.
Virions have a buoyant density in CsCl of 1.39-1.44 g
cm-3. There are 3 sedimenting component(s) found in purified
preparations. The sedimentation coefficient is 126 S20w; of
the other(s) are 63-81.5-100 S20w.
A260/A280 ratio is 0.86-1.525-1.79. The thermal
inactivation point (TIP) is at 55-57.5-60°C. The longevity in
vitro (LIV) is 3-3.5-4 days. Although the titer is dependent on
the host, the decimal exponent (DEX) of the dilution end point is usually around
4-5. The infectivity is retained when deproteinized with phenol or
detergent.
The Mr
of the genome constitutes 0% of the virion by weight (T component), or 25% of
the virion by weight (M component), or 35% of the virion by weight (B
component). The genome is segmented; bipartite, segements are distributed among
2 particle types of linear, positive-sense,
single-stranded RNA. The complete genome is 10800 nucleotides
long, is sequenced and complete
sequence is about 6300 nucleotides long, is sequenced, but only an estimate is
available, complete sequence is 4500 nucleotides long. The genome has a
base ratio of 26 % guanine; 30 % adenine; 17.5 % cytosine; 26.5 % uracil. The
multipartite genome is divided among different particles, each segment
encapsidated separately and the segments are distributed between 2
different types of particles. The largest particles contain each one molecule of
RNA-1 (sedimenting component B). The medium sized particles contain each one
molecule of RNA-2 (sedimenting component M). The smallest particles contain no
nucleic acid and are found in the top (sedimenting component T) band after
sedimentation.
GenBank records for
nucleotide sequences;
complete genome sequences.
Proteins
constitute about 67-83.5-100% of the particle weight.
The viral genome encodes structural proteins and non-structural proteins.
Virions consist of 2 structural protein(s).
Lipids are not
reported.
Genome Organization and Replication
Natural Host
Domain
Viral hosts belong to the Domain
Eucarya.
Domain Eucarya
Kingdom Plantae.
Kingdom Plantae
Phylum Magnoliophyta
(Angiosperms, Class Magnoliopsida (Dicotyledonae).
Severity and Occurrence of
Disease
Host: Signs and symptoms vary
seasonally.
Virus is transmitted by a vector. Virus is transmitted by
mechanical inoculation; not transmitted by seeds.
Vector Transmission:
Virus is transmitted by arthropods, by insects
of the order Hemiptera, family Aphididae. Virus is transmitted in a
non-persistent manner.
Experimental Hosts and Symptoms
Under
experimental conditions susceptibility to infection by virus is found in many
families, several families. Susceptible host species are found in the Family
Amaranthaceae, Chenopodiaceae, Compositae,
Cruciferae, Cucurbitaceae, Labiatae,
Leguminosae-Papilionoideae, Plantaginaceae,
Primulaceae, Scrophulariaceae, Solanaceae,
Tetragoniaceae, Tropaeolaceae, Umbelliferae. The
following species were susceptible to experimental virus infection:
Amaranthus caudatus, Antirrhinum majus, Ballota
nigra, Beta vulgaris, Brassica campestris,
Brassica campestris ssp. rapa, Calendula officinalis,
Capsella bursa-pastoris, Capsicum frutescens, Chenopodium
album, Chenopodium amaranticolor, Chenopodium foliosum,
Chenopodium hybridum, Chenopodium quinoa, Cucumis
sativus, Cyamopsis tetragonoloba, Datura metel,
Datura stramonium, Glycine max, Gomphrena globosa,
Lactuca sativa, Lamium album, Lamium purpureum,
Lathyrus odoratus, Lupinus angustifolius, Marrubium
peregrinum, Marrubium vulgare, Matthiola incana,
Nicandra physalodes, Nicotiana clevelandii, Nicotiana
debneyi, Nicotiana glutinosa, Nicotiana megalosiphon,
Nicotiana rustica, Nicotiana sylvestris, Nicotiana
tabacum, Nicotiana x edwardsonii, Ocimum basilicum,
Petroselinum crispum, Petunia x hybrida, Phaseolus
vulgaris, Physalis floridana, Physalis peruviana,
Pisum sativum, Plantago lanceolata, Primula obconica
(1), Solanum nigrum, Spinacia oleracea, Tetragonia
tetragonioides, Tropaeolum majus, Vicia faba,
Vigna unguiculata.
Experimentally infected insusceptible Hosts: Families
containing insusceptible hosts: Chenopodiaceae,
Compositae,
Cruciferae, or
Cucurbitaceae,
Geraniaceae,
Labiatae,
Leguminosae-Papilionoideae, or
Solanaceae. Species inoculated with virus that do not show signs of
susceptibility: Beta vulgaris, Brassica campestris ssp.
chinensis, Brassica oleracea var. botrytis,
Cajanus cajan, Capsicum annuum, Chenopodium
amaranticolor, Coleus blumei, Cucumis melo,
Helianthus annuus, Lycopersicon esculentum, Lycopersicon
pimpinellifolium, Pelargonium zonale, Phaseolus lunatus,
Raphanus sativus, Solanum capsicastrum, Solanum
melongena, Solanum tuberosum, Sonchus oleraceus,
Vigna unguiculata, Zinnia elegans.
Histopathology: Virions are found in the cytoplasm.
Cytopathology: Inclusions are present in infected cells.
Inclusion bodies in the host cell are found in the cytoplasm. Cytoplasmic
inclusions are crystals, or amorphous X-bodies. Inclusions contain mature
virions.
The virus spreads in Africa, or Eurasia, or the Middle
East, or North America, or Australasia and Pacific Islands. The virus occurs in
Australia, or China, or the United Kingdom.
Type species 00.018.0.02.001.
Broad bean wilt virus 1 .
List of Species in the
Genus.
Data Sources and
Contributions
The
following generic references are cited in the most recent ICTV Report.
PubMed References.
Taxon images: • EM from IACR Rothamsted.
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