Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Carmoviruses:
Tombusviridae
Index
Nomenclature
ICTV reference
Definitive species
Tentative species
Host range and
symptoms
Natural host range and symptoms
Symptoms
persist (7/13), or vary seasonally (3/13), or disappear soon after infection
(1/13), or none (4/13).
Transmission
Transmitted by a vector (6/10), or means not
involving a vector (4/10); an insect (4/6), or a fungus (2/6); Coleoptera (3/3);
Chytridiales (2/2). Transmitted in a non-persistent manner (1/1). Virus does
not require a helper virus for vector transmission (1/1); transmitted by
mechanical inoculation (19/20), or not transmitted by mechanical inoculation
(1/20); transmitted by grafting (4/5), or not transmitted by grafting (1/5);
transmitted by contact between plants (5/9), or not transmitted by contact
between plants (4/9); transmitted by seed (4/11), or not transmitted by seed
(7/11); not transmitted by pollen (1/1).
Experimental host range
Many (>9) families susceptible
(2/19), or several (3-9) families susceptible (10/19), or few (<3) families
susceptible (7/19).
Susceptible host species
Insusceptible host species
Families containing susceptible hosts
Families containing
insusceptible hosts
Physical and
biochemical properties
Properties of particles in sap
TIP:
55-77.62-95 °C. LIV: 1-48.3-395 days. DEP: log10 minus 4 (3/15), or 5 (6/15),
or 6 (9/15), or 7-8 (2/15). Infectivity of sap not changed by treatment with
di-ethyl ether (3/3). Leaf sap contains few virions (3/14), or contains many
virions (12/14).
Particle morphology
Virions isometric; not enveloped
(19/19); 27-30.5-34 nm in diameter; rounded in profile (11/16), or angular in
profile (5/16), or neither clearly angular or nor rounded in profile (1/16);
with a conspicuous capsomere arrangement (11/16), or without a conspicuous
capsomere arrangement (5/16).
Physical properties
One sedimenting component in purified
preparations (17/19), or two sedimenting components in purified preparations
(2/19); sedimentation coefficient 112-124.6-143 S; of the other(s) 48
S. Density 1.33-1.348-1.364 g cm-3 in CsCl. Isoelectric point pH
3.5-4.833-5.5. A260/A280 ratio 1.48-1.548-1.64.
Biochemical properties
Virions contain 14-19.13-23 %
nucleic acid; 77-80.93-86 % protein; 0 % lipid.
Genome consists of RNA; single-stranded; linear (7/7). Total genome size
3.94-4.45-5.3 kb. Genome unipartite (19/19); largest (or only) genome part
3.94-4.402-5.3 kb. Base composition 21.7-26.33-32 % G; 23-25.72-30 % A;
19-24.11-31.5 % C; 21-23.95-27 % U. 5´ terminus of RNA has a methylated
nucleotide cap (1/1). Infectivity retained when deproteinised with proteases
(1/1); retained when deproteinised with phenol or detergent (2/2). Poly A region
absent (3/3). Additional factor not required for infectivity (1/1). Genome has
no tRNA-like activity (1/1).
Features of the genome
Non-genomic nucleic acid
found in the virions (3/5), or not found in the virions (2/5); is subgenomic
mRNA (3/3). Sub-genomic mRNA found in infected cells (2/2). 3
virus specified dsRNA species found in infected cells. Size of largest virus
specified dsRNA 4-4.2-4.4 kbp; 2nd largest 1.5-1.7-1.9 kbp; 3rd largest
1.35-1.525-1.7 kbp.
Features of proteins
Virion protein(s) one (19/19);
Mr 36400-40610-47000. Virion proteins not glycosylated (1/1). Virion
proteins not phosphorylated (1/1).
Virus-coded non-virion proteins isolated (2/3), or identified by
genomic sequence analysis (1/3); two proteins found (2/3), or three proteins
found (1/3), or four proteins found (1/3). Mr 50000-71610-85830.
Mr of 2nd largest 26840-26940-27000. Mr of 3rd
8000-9500-11000. Mr of 4th 6900.
Replication
Genome replicates in cytoplasm (2/2).
Replication does not depend on a helper virus (8/8). Acts as helper for a
satellite RNA (1/1).
Cytopathology
Virions found in cytoplasm (11/11), or in
nuclei (1/11), or in chloroplasts (1/11), or in mitochondria (2/11), or in cell
vacuoles (4/11). Inclusions present in infected cells (5/11), or absent from
infected cells (6/11); are crystals in the cytoplasm (2/5), or unusual in shape
(3/5); they contain virions (3/5), or they do not contain virions (2/5).
Taxonomy and
relationships
Viral family : Tombusviridae.
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
