Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Tomato top necrosis (?) nepovirus

Index

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

Data collated by R. Stace-Smith, 1986.

Nomenclature

Acronym

ToTNV

ICTV decimal code

18.0.3.T.008

Host range and symptoms

Natural host range and symptoms

Symptoms disappear soon after infection.
• Lycopersicon esculentum - rings and lines on young leaves; stripes on the stem; concentric rings on the fruit.

Geographical distribution

Spreads in the USA.

Experimental host range

Many (>9) families susceptible.

Diagnostically susceptible host species and symptoms

• Chenopodium quinoa - local lesions and systemic necrosis.
• C. murale - local lesions only.
• Nicotiana tabacum - mild ring and line patterns.
• N. affinis - numerous faint small rings.
• Datura stramonium - indefinite rings and lines.

Diagnostically insusceptible host species

Tetragonia tetragonioides, Beta vulgaris, Zinnia elegans, Brassica campestris ssp. rapa, Cucumis sativus.

Maintenance and propagation hosts

Chenopodium quinoa, Nicotiana tabacum.

Assay hosts (Local lesions or Whole plants)

Chenopodium quinoa (L), Nicotiana tabacum (L), Lycopersicon esculentum (W).

Susceptible host species

• Amaranthus retroflexus
• Chenopodium murale
• Chenopodium quinoa
• Datura stramonium
• Datura tatula
• Lycopersicon esculentum
• Lycopersicon pimpinellifolium
• Nicandra physalodes
• Nicotiana affinis
• Nicotiana tabacum
• Petunia × hybrida
• Solanum melongena
• Solanum tuberosum

Insusceptible host species

• Beta vulgaris
• Brassica campestris ssp. rapa
• Brassica oleracea var. capitata
• Chenopodium album
• Cucumis melo
• Cucumis sativus
• Cucurbita maxima
• Cucurbita moschata
• Nicotiana glutinosa
• Nicotiana sylvestris
• Tetragonia tetragonioides
• Zinnia elegans

Families containing susceptible hosts

• Amaranthaceae (1/1)
• Chenopodiaceae (2/4)
• Solanaceae (10/12)

Families containing insusceptible hosts

• Chenopodiaceae (2/4)
• Compositae (1/1)
• Cruciferae (2/2)
• Cucurbitaceae (4/4)
• Solanaceae (2/12)
• Tetragoniaceae (1/1)

Sources of host-range data

Imle and Samson (1942).

Physical and biochemical properties

Properties of particles in sap

TIP: 58 °C. LIV: 2 days. DEP: log₁₀ minus 1:500.

Purification method

Bancroft (1968).

Particle morphology

Virions isometric; not enveloped; 26 nm in diameter; angular in profile; without a conspicuous capsomere arrangement.

Physical properties

Three sedimenting components in purified preparations; sedimentation coefficient of the fastest 126 S (B); of the other(s) 52 S (T), or 102 S (M). A₂₆₀/A₂₈₀ ratio 1.71 (M), or 1.82 (B).

Taxonomy and relationships

Possible Nepovirus: Comoviridae

Virus(es) with serologically unrelated virions

Arabis mosaic, raspberry ringspot, strawberry latent ringspot, tobacco ringspot, tomato black ring and tomato ringspot viruses.

Comments and References

General comments

This virus was isolated and studied in the 1960's. Stace-Smith obtained an isolate from Purdue University, where it was last studied. However, the culture was not infective, and no other source is known.

References

• Bancroft, J.B. (1968). Phytopathology 32: 1037.
• Harrison, B.D. and Murant A.F. (1977). CMI/AAB Descr. Pl. Viruses No. 185, 4 pp.
• Imle, E.P. and Samson, R.W. (1942). Phytopathology 58: 1360. .

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.