Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Humulus
japonicus ilarvirus
Index
Data collated by A.N. Adams, 1991.
Nomenclature
Acronym
ICTV decimal code
Host range and symptoms
First reported
in Humulus japonicus; from the U.K. in seedlings grown from seed imported
from the Peoples Republic of China; by Adams et al. (1989).
Natural host range and symptoms
- Humulus japonicus,
H. lupulus - symptomless.
Transmission
Virus transmitted by mechanical inoculation;
transmitted by seed.
Ecology and control
Studies reported by
Adams et al. (1989).
Geographical distribution
Spreads
in China (probably; it was detected by serology in a few samples from China).
Found, but with no evidence of spread, in samples imported to the U.K., but is
now thought to have been eradicated.
Experimental host range
Many (>9) families
susceptible. Experimentally infected plants mostly show necrotic local lesions,
chlorotic mottle or mosaic in systemic leaves.
Diagnostically
susceptible host species and symptoms
- Chenopodium quinoa
- necrotic local lesions, systemic chlorosis and necrosis.
- Chenopodium
amaranticolor - pin-point necrotic local lesions, systemic chlorosis.
- Nicotiana clevelandii - etched necrotic local lesions, systemic
chlorosis and necrosis.
Diagnostically insusceptible host species
Lactuca sativa, Brassica oleracea, Vigna unguiculata, Nicotiana
glutinosa.
Maintenance and propagation hosts
Assay hosts (Local
lesions or Whole plants)
Chenopodium
quinoa (L) and C. amaranticolor (L).
Susceptible host
species
Insusceptible host
species
Families containing susceptible hosts
Families containing
insusceptible hosts
Sources of host-range data
Physical and
biochemical properties
Properties of particles in sap
LIV:
less than 0.25 days. Infectivity of sap not changed by treatment with
di-ethyl ether. Leaf sap contains many virions.
Purification method
Particle morphology
Virions isometric; not enveloped;
24-33 nm in diameter; rounded in profile; with a conspicuous capsomere
arrangement.
Physical properties
Four sedimenting components in
purified preparations. Density 1.364 g cm-3 in CsCl (fixed with 2%
formaldehyde).
Biochemical properties
Genome consists of RNA;
single-stranded. Total genome size 9.866 kb. Genome of four parts; largest
(or only) genome part the largest 3.393 kb; the 2nd largest 2.958 kb; the 3rd
largest 2.113 kb; the 4th largest 1.099 kb. Genomic nucleic acid isolated by
Adams et al. (1989). Infectivity retained when deproteinised with phenol
or detergent.
Features of proteins
Virion protein(s) one;
Mr 26350. Method of preparation: Adams et al. (1989).
Replication
Replication does not depend on a helper
virus.
Cytopathology
Taxonomy and
relationships
Virus(es) with serologically related virions
Prunus necrotic ringspot virus, but distantly.
Virus(es)
with serologically unrelated virions
Apple
mosaic, prune dwarf, American plum line pattern, tobacco streak, asparagus 2,
citrus leaf rugose, citrus variegation, elm mottle and lilac ring mottle
viruses.
Best tests for diagnosis
Its only
known natural hosts are species of Humulus. Test plant reactions could be
confused with those of prunus necrotic ringspot virus which is widespread in
hops and hence diagnosis is best confirmed by serology. Clear results obtained
with ISEM and decoration.
Comments and
References
References
- Adams, A.N., Clark, M.F.
and Barbara, D.J. (1989). Ann. appl. Biol. 114: 497.
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