Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Tymoviruses
Index
Nomenclature
ICTV reference
Definitive species
Tentative species
Host range and
symptoms
Natural host range and symptoms
Symptoms
persist (18/20), or vary seasonally (1/20), or disappear soon after infection
(1/20), or none (2/20).
Transmission
Transmitted by a vector (11/12), or means
not involving a vector (2/12); an insect (10/10); Coleoptera (10/10).
Transmitted in a non-persistent manner (3/5), or in a semi-persistent
manner (2/5). Virus transmitted by mechanical inoculation (20/20); transmitted
by grafting (8/9), or not transmitted by grafting (1/9); transmitted by contact
between plants (1/7), or not transmitted by contact between plants (6/7);
transmitted by seed (4/16), or not transmitted by seed (12/16); not transmitted
by pollen (5/5).
Experimental host range
Many (>9) families susceptible
(3), or several (3-9) families susceptible (9), or few (<3) families
susceptible (9).
Susceptible host species
Insusceptible host species
Families containing susceptible hosts
Families containing insusceptible
hosts
Physical and
biochemical properties
Properties of particles in sap
TIP:
55-70.62-90 °C. LIV: 2-22.1-100 days. DEP: log10 minus 2 (1), or 3 (2), or 4
(5), or 5 (4), or 6 (7), or 7 (5), or 8 (4), or 9 (1). Infectivity of sap not
changed by treatment with di-ethyl ether (11/11). Leaf sap contains few
virions (1/19), or contains many virions (18/19).
Particle morphology
Virions isometric; not enveloped
(20/20); 25-28.03-32 nm in diameter; rounded in profile (18/20), or angular in
profile (4/20); with a conspicuous capsomere arrangement (15/19), or without a
conspicuous capsomere arrangement (4/19).
Physical properties
Two sedimenting components in
purified preparations (20/20); sedimentation coefficient 106-114.2-125 S;
of the other(s) 42-53.87-64 S. Density 1.26-1.358-1.45 g cm-3 in
CsCl. Isoelectric point pH 3.3-5.893-9.46. A260/A280 ratio
0.64-2.075-8.51.
Biochemical properties
Virions contain 23-34.73-39 %
nucleic acid; 61-64.85-77 % protein; 0 % lipid.
Genome consists of RNA; single-stranded; linear (16/16). Total genome
size 2-5.028-6.5 kb. Genome unipartite (16/16); largest (or only) genome part
2-5.028-6.5 kb. Base composition 13.6-16.35-20.5 % G; 17-21.91-24.1 % A;
31.3-35.55-41 % C; 22.15-26.24-29.4 % U. 5´ terminus of RNA has a methylated
nucleotide cap (5/6), or an unusual type (1/6). Infectivity retained when
deproteinised with proteases (3/3); retained when deproteinised with phenol or
detergent (10/10). Poly A region present (1/4), or absent (3/4). Additional
factor not required for infectivity (5/5). Genome has tRNA-like
activity (5/7), or has no tRNA-like activity (2/7).
Features of the genome
Non-genomic nucleic acid
found in the virions (4/4); is subgenomic mRNA (3/4), or of an unusual
type of structure (1/4). Sub-genomic mRNA found in infected cells
(4/4).
Features of proteins
Virion protein(s) one (16/16);
Mr 19420-20600-22200. Virion proteins not glycosylated (3/3). Virion
proteins not phosphorylated (3/3).
Virus-coded non-virion proteins identified by genomic sequence
analysis (1/1); two proteins found (1/1). Mr 48490. Mr of
2nd largest 193800.
Replication
Genome replicates in association with
chloroplasts (9/9). Replication does not depend on a helper virus (15/15).
Cytopathology
Virions found in cytoplasm (15/16), or in
nuclei (5/16), or in nucleoli (1/16), or in chloroplasts (3/16), or in
mitochondria (2/16), or in cell vacuoles (4/16). Inclusions present in infected
cells (5/11), or absent from infected cells (6/11); are crystals in the
cytoplasm (4/5), or crystals in the nucleus (2/5), or unusual in shape (2/5);
they contain virions (5/5).
Taxonomy and relationships
No data available.
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
