Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Comoviruses:
Comoviridae
Index
Nomenclature
ICTV reference
Definitive species
Host range and
symptoms
Natural host range and symptoms
Symptoms
persist (7/10), or vary cyclically over a few weeks (3/10), or vary seasonally
(2/10).
Transmission
Transmitted by a vector (10/10); an insect
(10/10); Coleoptera (10/10). Transmitted in a non-persistent manner (1/2), or
in a semi-persistent manner (1/2). Virus does not multiply in the vector
(1/1); not transmitted congenitally to the progeny of the vector (1/1);
transmitted by mechanical inoculation; transmitted by grafting (6/6);
transmitted by contact between plants (1/2), or not transmitted by contact
between plants (1/2); transmitted by seed (6/12), or not transmitted by seed
(6/12); transmitted by pollen to the seed (1/3), or not transmitted by pollen
(2/3).
Experimental host range
Many (>9) families susceptible
(1), or several (3-9) families susceptible (7), or few (<3) families
susceptible (6).
Susceptible host species
Insusceptible host species
Families containing susceptible hosts
Families containing
insusceptible hosts
Physical and
biochemical properties
Properties of particles in sap
TIP:
55-66.1-80 °C. LIV: 2-23.71-112 days. DEP: log10 minus 3 (2), or 4 (9), or 5
(6), or 6 (3), or 7-8 (1). Infectivity of sap decreased by treatment with
di-ethyl ether (1/6), or not changed by treatment with di-ethyl ether
(5/6). Leaf sap contains few virions (1/12), or contains many virions (11/12).
Particle morphology
Virions isometric; not enveloped
(13/13); 20-27.53-30 nm in diameter; rounded in profile (1/13), or angular in
profile (13/13); with a conspicuous capsomere arrangement (3/11), or without a
conspicuous capsomere arrangement (8/11).
Physical properties
Two sedimenting components in
purified preparations (1), or three sedimenting components in purified
preparations; sedimentation coefficient 112-118.5-130 S; of the other(s)
51-76.71-103 S. Density 1.288-1.401-1.463 g cm-3 in CsCl.
Isoelectric point pH 4.3-5.317-7. A260/A280 ratio 0.86-1.648-1.81.
Biochemical properties
Virions contain 0-17.87-38.6 %
nucleic acid; 62-82.19-100 % protein; 0 % lipid.
Genome consists of RNA (13/13); single-stranded (13/13); linear (7/7).
Total genome size 9.57-11.02-13.5 kb. Genome of two parts (12/12); largest (or
only) genome part 6-6.757-8.5 kb; the 2nd largest 3.54-4.279-5 kb. Base
composition 19.1-22.5-25 % G; 26.5-29.17-33.4 % A; 16.2-17.96-20.4 % C;
27-30.33-32.3 % U. 5´ terminus of RNA has a VPg (4/4). Infectivity retained
when deproteinised with proteases (2/2), or decreased when deproteinised with
proteases (1/2); retained when deproteinised with phenol or detergent (5/5).
Poly A region present (5/5). Genome has no tRNA-like activity (1/1).
Features of the genome
Non-genomic nucleic acid
not found in the virions (6/6). Sub-genomic mRNA not found in infected
cells (1/1).
Features of proteins
Virion protein(s) two (6/11), or
three (5/11); Mr 37500-40750-45100. Mr of 2nd largest
20700-22320-24500. Mr of 3rd largest 3538-11800-21000. Virion proteins
glycosylated (2/2).
Virus-coded non-virion proteins isolated (1/1); six proteins found
(1/1). Mr 189900. Mr of 2nd largest 51000. Mr of
3rd 32000. Mr of 4th 111900. Mr of 5th and smaller
22000-63500-104900.
Replication
Genome replicates in cytoplasm (1/1).
Replication does not depend on a helper virus (10/10).
Cytopathology
Virions found in cytoplasm (8/8), or in
cell vacuoles (2/8). Inclusions present in infected cells (8/8); are crystals in
the cytoplasm (4/8), or unusual in shape (8/8); they contain virions (5/5).
Taxonomy and
relationships
Viral family : Comoviridae.
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
