Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Spinach latent
ilarvirus
Index
Data collated by L. Bos, 1987.
Nomenclature
Synonyms
GE 36 virus (Van der Meer, 1968; Maat and Vink,
1971).
Acronym
ICTV decimal code
Host range and symptoms
First reported
in Spinacia oleracea; from plants grown from seed of spinach (Spinacia
oleracea) from several countries; by Bos et al. (1980).
Natural host range and symptoms
Symptoms disappear soon
after infection.
- Spinacia oleracea - symptomless or transient faint mosaic and
vein clearing.
Transmission
Transmitted by means not involving a vector.
Virus transmitted by mechanical inoculation; transmitted by seed; transmitted by
pollen to the seed and transmitted by pollen to the pollinated plant
(Stefanac and Wrischer, 1983).
Ecology and control
Studies reported by Bos et al. (1980).
Geographical
distribution
Spreads in the Netherlands, the USA, and the former
Yugoslavia.
Experimental host range
Many (>9) families
susceptible.
Diagnostically susceptible host species and
symptoms
- Beta vulgaris - small chlorotic or etched
rings.
- Celosia cristata - symptomless.
- Chenopodium
amaranticolor - pin-point desiccated chlorotic local lesions.
- Chenopodium quinoa - diffuse chlorotic local lesions then systemic
leaf rolling, chlorotic vein banding, mottling, stunting and tip blight.
- Cucumis sativus cv. Gele Tros - transient chlorotic local lesions.
- Phaseolus vulgaris cv. Bataaf - necrotic local lesions.
- Nicotiana clevelandii, N. rustica, N. glutinosa, N. tabacum, Tetragonia
tetragonioides, Gomphrena globosa - symptomless systemic infection.
Diagnostically insusceptible host species
Apium
graveolens, Cyamopsis tetragonoloba, Datura stramonium, Lactuca sativa,
Lycopersicon esculentum, Pisum sativum.
Maintenance and
propagation hosts
Chenopodium quinoa, Nicotiana spp.
Assay hosts (Local lesions or Whole plants)
Chenopodium amaranticolor (L),
C. quinoa (L) and (W), Phaseolus vulgaris (L).
Susceptible host species
Insusceptible host species
Families containing susceptible hosts
Families containing
insusceptible hosts
Comments on host-range
Infection in
most species is symptomless.
Sources of host-range data
Physical and
biochemical properties
Properties of particles in sap
TIP:
60-65 °C. LIV: 6-8 days. DEP: log10 minus 3-4. Electron microscopy: virions
are labile and difficult to locate without fixation.
Purification method
Particle morphology
Virions isometric; not enveloped; 27
nm in diameter; rounded in profile; without a conspicuous capsomere arrangement.
Physical properties
Three sedimenting components in
purified preparations; sedimentation coefficient of the fastest 103 S
(B); of the other(s) 87 and 98 S (T and (M), respectively). Density 1.269
in Cs2SO4.
Biochemical properties
Genome consists of RNA;
single-stranded; linear. Total genome size 11.295 kb. Genome of five parts;
largest (or only) genome part the largest 3.662 kb; the 2nd largest 3.324 kb;
the 3rd largest 2.563 kb; the 4th largest 0.986 kb; the 5th largest 0.76 kb.
Genomic nucleic acid isolated by Bos et al. (1980). Additional factor
required for infectivity; one or two of the two smallest RNA segments or coat
protein required for infectivity of the three largest segments.
Features of proteins
Virion protein(s) one;
Mr 20000. Method of preparation: Bos et al. (1980).
Replication
Replication does not depend on a helper
virus.
Cytopathology
Virions found in leaves and mesophyll.
Inclusions absent from infected cells. Other cellular changes: groups of
vesicles surrounded by a unit membrane in cytoplasm and small vacuoles of leaf
parenchyma cells (Stefanac and Wrischer, 1983).
Taxonomy and
relationships
Virus(es) with serologically unrelated virions
Apple mosaic, elm mottle, lilac ring mottle, prunus necrotic ringspot
and tobacco streak viruses (but ilarviruses are poorly immunogenic).
Best tests for diagnosis
Cucumber
mosaic virus induces characteristic local lesions in Chenopodium quinoa
and infects cucumber and Nicotiana spp. systemically. Cucumber mosaic
virus and tobacco rattle virus rarely infect Chenopodium quinoa
systemically. Spinach latent virus induces characteristic local and systemic
reactions in Chenopodium quinoa.
Comments and
References
References
- Bos, L. (1984).
CMI/AAB Descr. Pl. Viruses No. 281, 4 pp.
- Bos, L., Huttinga, H. and
Maat, D.Z. (1980). Neth. J. Pl. Path. 86: 79.
- Maat, D.Z. and
Vink, J. (1971). Neth. J. Pl. Path. 77: 93.
- Stefanac, Z.
(1978). Acta bot. Croat. 37: 39.
- Stefanac, Z. and
Wrischer, M. (1983). Acta bot. Croat. 42: 1.
- Van der Meer,
F.A. (1968). TagBer. dt. Akad. Landw. Berlin 97: 27.
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