Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Ilarviruses:
Bromoviridae
Index
Nomenclature
ICTV reference
Definitive species
Tentative species
Host range and
symptoms
Natural host range and symptoms
Symptoms
persist (10/17), or vary cyclically over a few weeks (1/17), or vary seasonally
(7/17), or disappear soon after infection (3/17).
Transmission
Transmitted by a vector (1/6), or means not
involving a vector (5/6); an insect (1/1); Thysanoptera (1/1). Virus transmitted
by mechanical inoculation (19/19); transmitted by grafting (15/15); transmitted
by contact between plants (1/7), or not transmitted by contact between plants
(6/7); transmitted by seed (13/15), or not transmitted by seed (2/15);
transmitted by pollen to the seed (4/6), or transmitted by pollen to the
pollinated plant (6/6).
Experimental host range
Many (>9) families susceptible
(8/20), or several (3-9) families susceptible (8/20), or few (<3) families
susceptible (4/20).
Susceptible host species
Insusceptible host
species
Families containing susceptible hosts
Families containing
insusceptible hosts
Physical and
biochemical properties
Properties of particles in sap
TIP:
45-57.35-66 °C. LIV: 0.0069-3.036-21 days. DEP: log10 minus 1 (1/13), or 2
(3/13), or 3 (9/13), or 4 (6/13), or 5-7 (1/13). Infectivity of sap increased by
treatment with di-ethyl ether (1/4), or not changed by treatment with
di-ethyl ether (3/4). Leaf sap contains few virions (7/8), or contains many
virions (1/8).
Particle morphology
Virions isometric (18/20), or
bacilliform (1/20), or unusually shaped (2/20); not enveloped (16/16);
19-27.46-36 nm in diameter; 20-39.16-54.5 nm in length; rounded in profile
(14/16), or angular in profile (1/16), or neither clearly angular or nor rounded
in profile (1/16); with a conspicuous capsomere arrangement (2/15), or without a
conspicuous capsomere arrangement (13/15).
Physical properties
One sedimenting component in purified
preparations (2/16), or two sedimenting components in purified preparations
(2/16), or three sedimenting components in purified preparations (9/16), or four
sedimenting components in purified preparations (3/16), or five sedimenting
components in purified preparations (1/16); sedimentation coefficient
90-106.9-125 S; of the other(s) 72-92.33-114 S. Density
1.33-1.351-1.37 g cm-3 in CsCl. Isoelectric point pH 4.6. A260/A280
ratio 1.31-1.49-1.67.
Biochemical properties
Virions contain 12-15.43-24 %
nucleic acid; 76-84.56-88 % protein; 0 % lipid.
Genome consists of RNA (16/16); single-stranded (16/16); linear (7/7).
Total genome size 7.717-9.86-12.22 kb. Genome of three parts (6/14), or of four
parts (5/14), or of five parts (4/14); largest (or only) genome part
2.901-3.532-4.3 kb; the 2nd largest 2.366-3-3.7 kb; the 3rd largest
1.605-2.322-2.7 kb; the 4th largest 0.845-1.1-1.409 kb; the 5th largest
0.76-0.812-0.871 kb. Base composition 24-25.33-27 % G; 24-24.66-25 % A;
20-20.66-21 % C; 27-29.33-31 % U. 5´ terminus of RNA has a methylated
nucleotide cap (1/1). Infectivity retained when deproteinised with proteases
(2/3), or lost when deproteinised with proteases (1/3); retained when
deproteinised with phenol or detergent (5/6), or lost when deproteinised with
phenol or detergent (1/6). Poly A region present (1/1). Additional factor
required for infectivity (6/6). Genome has no tRNA-like activity
(1/1).
Features of the genome
Non-genomic nucleic acid
found in the virions (6/6); is subgenomic mRNA (6/6). Sub-genomic
mRNA found in infected cells (3/4), or not found in infected cells (1/4).
Features of proteins
Virion protein(s) one (14/14);
Mr 19000-25220-30000. Virion proteins not glycosylated (1/1).
Replication
Replication does not depend on a helper virus
(13/13).
Cytopathology
Virions found in cytoplasm (3/3), or in
nuclei (1/3). Inclusions present in infected cells (1/5), or absent from
infected cells (4/5); are unusual in shape (1/1); they do not contain virions
(1/1).
Taxonomy and
relationships
Viral family : Bromoviridae.
Illustrations
Cite this publication as:
Brunt, A.A., Crabtree, K., Dallwitz, M.J., Gibbs, A.J., Watson, L. and Zurcher, E.J. (eds.)
(1996 onwards).
`Plant Viruses Online: Descriptions and Lists from the VIDE Database.
Version: 20th August 1996.' URL
http://biology.anu.edu.au/Groups/MES/vide/
Dallwitz (1980)
and
Dallwitz, Paine and Zurcher (1993)
should also be cited.
Please send comments, corrections and suggestions to:
vide-manager@biology.anu.edu.au
