Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Umbraviruses
Index
Nomenclature
ICTV reference
Definitive species
Tentative species
Host range and
symptoms
Natural host range and symptoms
Symptoms
persist (3/4), or vary seasonally (1/4).
Transmission
Transmitted by a vector (7/7); an insect
(7/7); Aphididae (7/7). Transmitted in a persistent manner (6/6). Virus retained
when the vector moults (3/3); does not multiply in the vector (2/2); not
transmitted congenitally to the progeny of the vector (2/2); requires, for
vector transmission, a helper virus (7/7); transmitted by mechanical inoculation
(7/7); transmitted by grafting (1/1); not transmitted by contact between plants
(1/1); not transmitted by seed (2/2); not transmitted by pollen (1/1).
Experimental host range
Many (>9) families susceptible
(1/7), or several (3-9) families susceptible (3/7), or few (<3) families
susceptible (3/7).
Susceptible host species
Insusceptible host
species
Families containing susceptible hosts
Families containing
insusceptible hosts
Physical and
biochemical properties
Properties of particles in sap
TIP:
55-62.5-70 °C. LIV: 0.2-1.533-2 days. DEP: log10 minus 2 (1/2), or 3 (2/2).
Infectivity of sap decreased by treatment with di-ethyl ether (1/2), or not
changed by treatment with di-ethyl ether (1/2). Leaf sap contains few virions
(1/1).
Particle morphology
Virions isometric (1/2), or unusually
shaped (1/2); not enveloped (1/1); 50-70-90 nm in diameter; rounded in profile
(1/1).
Physical properties
One sedimenting component in purified
preparations (2/2); sedimentation coefficient 270 S. Density 1.15 g
cm-3 in CsCl.
Biochemical properties
Genome consists of RNA (4/4);
single-stranded (4/4); linear (3/3). Total genome size 4.203-5.284-6.9 kb.
Genome unipartite (3/3); largest (or only) genome part 2.05-3.667-4.75 kb. Base
composition 27 % G; 25 % A; 25.5 % C; 22.4 % U. Infectivity retained when
deproteinised with proteases (1/1); retained when deproteinised with phenol or
detergent (1/1). Poly A region absent (1/1). Additional factor not required for
infectivity (2/2). Genome has no tRNA-like activity (1/1).
Features of the genome
Non-genomic nucleic acid
found in the virions (2/2); is subgenomic mRNA (1/2), or satellite RNA
(1/2). Sub-genomic mRNA found in infected cells (2/2). 2 virus
specified dsRNA species found in infected cells. Size of largest virus specified
dsRNA 4.2 kbp; 2nd largest 1.5 kbp.
Features of proteins
Virion protein(s) none (1/1).
Replication
Genome replicates in cytoplasm (1/1).
Replication depends on co-infection with a helper virus (1/2), or does not
depend on a helper virus (1/2). Acts as helper for a satellite virus (1/1).
Cytopathology
Inclusions present in infected cells (1/1);
are membranous bodies (1/1); they do not contain virions (1/1).
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