Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Potexviruses
Index
Nomenclature
ICTV reference
Definitive species
Tentative species
Host range and
symptoms
Natural host range and symptoms
Symptoms
persist (23/29), or vary seasonally (3/29), or none (4/29).
Transmission
Transmitted by a vector (11/22), or means
not involving a vector (11/22); an insect (8/10), or a mite (2/10); Aphididae
(7/8), or an unusual insect group (1/8); Eriophyidae (2/2). Transmitted in a
non-persistent manner (6/6). Virus requires, for vector transmission, a
helper virus (2/3), or does not require a helper virus for vector transmission
(1/3); transmitted by mechanical inoculation (43/46), or not transmitted by
mechanical inoculation (3/46); transmitted by grafting (7/7); transmitted by
contact between plants (5/11), or not transmitted by contact between plants
(6/11); transmitted by seed (2/19), or not transmitted by seed (17/19); not
transmitted by pollen (4/4).
Experimental host range
Many (>9) families susceptible
(4/40), or several (3-9) families susceptible (23/40), or few (<3) families
susceptible (13/40).
Susceptible host species
Insusceptible host species
Families containing susceptible hosts
Families containing
insusceptible hosts
Physical and
biochemical properties
Properties of particles in sap
TIP:
55-69.3-100 °C. LIV: 0.25-80.59-365 days. DEP: log10 minus 3 (4/28), or 4
(7/28), or 5 (12/28), or 6 (14/28), or 7 (4/28), or 9 (2/28), or 10 (1/28).
Infectivity of sap not changed by treatment with di-ethyl ether (4/4). Leaf
sap contains few virions (10/31), or contains many virions (21/31).
Particle morphology
Virions filamentous (51/51); not
enveloped (38/38); usually flexuous (45/45); with a clear modal length (50/50);
of 445-523.1-775 nm; 11-12.8-15 nm wide. Axial canal obvious (2/35), or obscure
(33/35); 3.4-6.3-12 nm in diameter. Basic helix obvious (8/27), or obscure
(19/27); pitch of basic helix 2.8-3.331-3.5 nm.
Physical properties
One sedimenting component in purified
preparations (17/22), or two sedimenting components in purified preparations
(5/22); sedimentation coefficient 110-122-144 S; of the other(s)
102-111.6-122 S. Density 1.28-1.308-1.33 g cm-3 in CsCl.
Isoelectric point pH 4-4.75-5.3. A260/A280 ratio 1.18-1.229-1.4.
Biochemical properties
Virions contain 5-5.755-8 %
nucleic acid; 92-94.14-95 % protein; 0 % lipid.
Genome consists of RNA (25/25); single-stranded (25/25); linear (16/16).
Total genome size 5.845-6.725-8.1 kb. Genome unipartite (22/22); largest (or
only) genome part 5.845-6.725-8.1 kb. Base composition 15.5-21.12-25 % G;
26.4-29.9-33.8 % A; 23.4-26.02-30.3 % C; 20.5-22.92-25.7 % U. 5´ terminus of
RNA has a methylated nucleotide cap (1/3), or an unusual type (2/3). Infectivity
retained when deproteinised with proteases (1/1); retained when deproteinised
with phenol or detergent (6/6). Poly A region present (5/5). Additional factor
not required for infectivity (3/3).
Features of the genome
Non-genomic nucleic acid
found in the virions (3/9), or not found in the virions (6/9); is subgenomic
mRNA (3/3). Sub-genomic mRNA found in infected cells (4/4). 4
virus specified dsRNA species found in infected cells. Size of largest virus
specified dsRNA 6-11.55-17.1 kbp; 2nd largest 4.2-5.6-7 kbp; 3rd largest
1.7-3.7-5.7 kbp; 4th largest 0.5-2.55-4.6 kbp.
Features of proteins
Virion protein(s) one (25/26),
or two (1/26); Mr 14000-24340-30000. Mr of 2nd largest
30500. Virion proteins not glycosylated (2/2).
Virus-coded non-virion proteins isolated (2/4), or identified by
genomic sequence analysis (2/4); one protein found (2/4), or three proteins
found (1/4), or five proteins found (1/4). Mr 115900-141800-159900.
Mr of 2nd largest 25340-45670-66000. Mr of 3rd
11570-27780-44000. Mr of 4th 11210. Mr of 5th and smaller
8079.
Replication
Replication does not depend on a helper virus
(19/19).
Cytopathology
Virions found in cytoplasm (26/26), or in
nuclei (1/26), or in cell vacuoles (4/26). Inclusions present in infected cells
(23/27), or absent from infected cells (4/27); are crystals in the cytoplasm
(3/19), or crystals in the nucleus (1/19), or amorphous X-bodies (2/19), or
viroplasms (1/19), or unusual in shape (15/19); they contain virions (19/20), or
they do not contain virions (1/20).
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
