Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Potato U nepovirus

Index

• Nomenclature
• Host range, transmission and symptoms
• Physical and biochemical properties
• Taxonomy and relationships
• Comments and References

Data collated by R.A.C. Jones, 1989.

Nomenclature

Acronym

PVU

ICTV decimal code

18.0.3.0.025

Host range and symptoms

Natural host range and symptoms

• Solanum tuberosum - yellow leaf markings (calico); it is difficult to infect potato, even by grafting, so it may normally infect another unidentified plant species, or may mostly infect potato roots and rarely infect systemically.

Transmission

Transmitted by a vector; a nematode; Longidorus sp. (P. Jatala and C.E. Fribourg, unpublished); Dorylamidae. Virus transmitted by mechanical inoculation; transmitted by grafting; not transmitted by contact between plants; transmitted by seed (in Nicotiana debneyi, N. tabacum, Chenopodium amaranticolor and C. quinoa. It is readily seed borne in some test plant species and, therefore, seed transmission may be important for natural spread).

Ecology and control

Studies reported by Jones et al. (1983).

Geographical distribution

Spreads in Peru.

Experimental host range

Many (>9) families susceptible.

Diagnostically susceptible host species and symptoms

• Chenopodium quinoa - chlorotic or necrotic spots, then systemic chlorotic mottle, leaf malformation and necrosis.
• C. murale - necrotic spots, systemic necrosis.
• C. amaranticolor - chlorotic and necrotic spots, systemic mottle and leaf malformation, later recovery.
• Nicotiana tabacum - systemic chlorotic ringspots and line patterns, recovery.
• Beta vulgaris (red beet) - red ringspots, then systemic red vein banding, plus red rings, spots and blotches.
• Cucumis sativus - chlorotic blotches, systemic vein clearing, chlorotic blotching and mosaic, later recovery.

Diagnostically insusceptible host species

Brassica campestris ssp. pekinensis, Phaseolus vulgaris, Capsicum sinensis.

Maintenance and propagation hosts

Nicotiana clevelandii, N. tabacum.

Assay hosts (Local lesions or Whole plants)

Chenopodium murale (L and W), C. amaranticolor (W), C. quinoa (W).

Susceptible host species

• Beta vulgaris
• Chenopodium album
• Chenopodium amaranticolor
• Chenopodium berthaultii
• Chenopodium capitatum
• Chenopodium ficifolium
• Chenopodium foliosum
• Chenopodium glaucum
• Chenopodium murale
• Chenopodium quinoa
• Cucumis sativus
• Datura metel
• Datura stramonium
• Gomphrena globosa
• Hyoscyamus niger
• Lycopersicon chilense
• Lycopersicon esculentum
• Lycopersicon pimpinellifolium
• Montia perfoliata
• Nicandra physalodes
• Nicotiana bigelovii
• Nicotiana clevelandii
• Nicotiana debneyi
• Nicotiana glutinosa
• Nicotiana occidentalis
• Nicotiana rustica
• Nicotiana tabacum
• Petunia × hybrida
• Physalis floridana
• Physalis peruviana
• Solanum chacoense
• Solanum chancayense
• Solanum demissum
• Solanum demissum × S. tuberosum
• Solanum goniocalyx
• Solanum megistacrolobum
• Solanum microdontum
• Solanum mochiquense
• Solanum stoloniferum
• Solanum tuberosum
• Solanum villosum
• Spinacia oleracea
• Tetragonia tetragonioides
• Vigna unguiculata
• Vigna unguiculata ssp. cylindrica

Insusceptible host species

• Brassica campestris ssp. pekinensis
• Capsicum sinensis
• Phaseolus vulgaris

Families containing susceptible hosts

• Amaranthaceae (1/1)
• Chenopodiaceae (11/11)
• Cucurbitaceae (1/1)
• Leguminosae-Papilionoideae (2/3)
• Portulacaceae (1/1)
• Solanaceae (28/29)
• Tetragoniaceae (1/1)

Families containing insusceptible hosts

• Cruciferae (1/1)
• Leguminosae-Papilionoideae (1/3)
• Solanaceae (1/29)

Sources of host-range data

Jones et al. (1983).

Physical and biochemical properties

Properties of particles in sap

TIP: 60-65 °C. LIV: 7-8 days. DEP: log₁₀ minus 3-4. Leaf sap contains few virions.

Purification method

Jones et al. (1983); Fribourg et al. (1978).

Particle morphology

Virions isometric; not enveloped; c. 28 nm in diameter; angular in profile; without a conspicuous capsomere arrangement.

Physical properties

Four sedimenting components in purified preparations (three major but one subdivides into two); sedimentation coefficient of the fastest 135 S (B); of the other(s) 117 S (M), or 55 S (Tb), or 40 S (Ta).

Features of proteins

Virion protein(s) one; M_r 58000; coat protein. Method of preparation: Koenig et al. (1970).

Taxonomy and relationships

Nepovirus: Comoviridae

Virus(es) with serologically unrelated virions

Arracacha A, arabis mosaic, artichoke Italian latent, artichoke vein banding, grapevine chrome mosaic, grapevine fan leaf, hibiscus latent ringspot, myrobalan latent ringspot, olive ringspot, potato black ringspot, raspberry ringspot, strawberry latent ringspot, tobacco ringspot (eucharis mottle strain), tomato black ring (beet, bouquet and potato pseudo aucuba strains) and tomato ringspot viruses.

Best tests for diagnosis

To distinguish from other potato viruses use gel diffusion and ISEM.

Comments and References

References

• Fribourg, C.E., Jones, R.A.C. and Koenig, R. (1978). Phytopathology 67: 969.
• Jones, R.A.C., Fribourg, C.E. and Koenig, R. (1983). Phytopathology 73: 195.
• Koenig, R., Stegemann, H., Francksen, H. and Paul, H.L. (1970). Biochim. biophys. Acta 207: 184.

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: 20^th August 1996.' URL http://biology.anu.edu.au/Groups/MES/vide/

Dallwitz (1980) and Dallwitz, Paine and Zurcher (1993) should also be cited.