Plant Viruses
Online 
Descriptions and Lists from
the VIDE Database
Sweet potato
ringspot (?) nepovirus
Index
Data collated by J.D. Brown and A.A. Brunt, 1988.
Nomenclature
ICTV decimal code
Host range and symptoms
First reported
in Ipomoea batatas cv. Wanmun; from the U.K. in a sweet potato imported
from Papua New Guinea; by Brown et al. (1988).
Natural host range and symptoms
Symptoms disappear soon
after infection.
- Ipomoea batatas - occasional chlorotic ringspots, then
symptomless.
Transmission
Virus transmitted by mechanical inoculation;
transmitted by grafting; not transmitted by contact between plants; transmitted
by seed.
Geographical distribution
Spreads in Papua New
Guinea.
Experimental host range
Several (3-9) families
susceptible.
Diagnostically susceptible host species and
symptoms
- Ipomoea batatas cvs Jasper and Rose Centennial
- chlorotic ringspots (after graft inoculation), then symptomless.
- Ipomoea setosa - faint systemic chlorotic leaf mottling.
- Nicotiana megalosiphon - necrotic rings, systemic leaf mottling.
- Nicotiana benthamiana - systemic leaf deformation.
- Glycine
max - systemic leaf chlorosis and stunting.
- Chenopodium quinoa, C.
murale - transient systemic chlorosis.
Diagnostically
insusceptible host species
Nicotiana debneyi, Trifolium
incarnatum, Vicia faba, Pisum sativum, Brassica campestris ssp.
pekinensis.
Maintenance and propagation hosts
Nicotiana megalosiphon, N. benthamiana, Ipomoea setosa.
Assay
hosts (Local lesions or Whole plants)
Nicotiana megalosiphon (W), Chenopodium murale (W),
C. quinoa (W).
Susceptible host species
Insusceptible host species
Families containing susceptible hosts
Families containing
insusceptible hosts
Sources of host-range data
Brunt
and Brown (unpublished information).
Physical and
biochemical properties
Properties of particles in sap
Leaf sap
contains few virions.
Purification method
Brunt and Brown
(unpublished information).
Particle morphology
Virions isometric; not enveloped; 28
nm in diameter; angular in profile; with a conspicuous capsomere arrangement.
Physical properties
Sedimentation coefficient 130
S (B); of the other(s) 87 S (M), or 47 S (T).
Biochemical properties
Genome consists of RNA;
single-stranded; linear. Total genome size 15.1 kb. Genome of two parts;
largest (or only) genome part the larger 8.4 kb; the 2nd largest 6.7 kb. Genomic
nucleic acid isolated by Brunt et al. (1989).
Features of proteins
Virion protein(s) one;
Mr 56500; coat protein. Method of preparation: Brunt: dissociation in
0.625 M Tris-HCl pH 6.8 containing 2% SDS and 5% 2-mercaptoethanol for 3 minutes
at 100ºC.
Cytopathology
Virions found in leaves and roots.
Taxonomy and
relationships
Virus(es) with serologically unrelated virions
Arabis mosaic, cassava green mottle, crimson clover latent, hibiscus
latent ringspot, cacao necrosis, grapevine chrome mosaic, cherry leaf roll,
peach rosette mosaic, raspberry ringspot, strawberry latent ringspot, tomato
black ring, tomato ringspot and tobacco ringspot viruses.
Comments and
References
References
- Brown, J.D., Brunt, A.A.
and Hugo, S.A. (1988). Rep. Glasshouse Crops Res. Inst. for 1986-1987, p.
104.
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