Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Tamus latent (?) potexvirus

Index

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

Data collated by A.A. Brunt and D.-E. Lesemann, 1991.

Nomenclature

ICTV decimal code

56.0.1.T.D.12

Host range and symptoms

Natural host range and symptoms

• Tamus communis - symptomless.

Transmission

Virus transmitted by mechanical inoculation.

Geographical distribution

Found, but with no evidence of spread, in the U.K.

Experimental host range

Several (3-9) families susceptible. Experimentally infected plants mostly show local lesions, then systemic vein chlorosis or necrosis.

Diagnostically susceptible host species and symptoms

• Nicotiana benthamiana, N. megalosiphon - systemic chlorotic and necrotic vein banding.
• Chenopodium amaranticolor, C. murale, C. quinoa, Gomphrena globosa, Tetragonia tetragonioides - local chlorotic or necrotic lesions.
• Datura stramonium, Lycopersicon esculentum, Nicotiana clevelandii - symptomless systemic infection.

Diagnostically insusceptible host species

Cucumis sativus, Nicotiana tabacum, Petunia × hybrida, Phaseolus vulgaris, Physalis floridana.

Maintenance and propagation hosts

Nicotiana benthamiana, N. megalosiphon.

Assay hosts (Local lesions or Whole plants)

Chenopodium amaranticolor (L), C. quinoa (L).

Susceptible host species

• Antirrhinum majus
• Chenopodium amaranticolor
• Chenopodium murale
• Chenopodium quinoa
• Datura metel
• Datura stramonium
• Gomphrena globosa
• Lycopersicon esculentum
• Nicotiana benthamiana
• Nicotiana clevelandii
• Nicotiana debneyi
• Nicotiana glutinosa
• Nicotiana megalosiphon
• Solanum demissum
• Tamus communis
• Tetragonia tetragonioides

Insusceptible host species

• Cucumis sativus
• Nicotiana tabacum
• Petunia × hybrida
• Phaseolus vulgaris
• Physalis floridana

Families containing susceptible hosts

• Amaranthaceae (1/1)
• Chenopodiaceae (3/3)
• Dioscoreaceae (1/1)
• Scrophulariaceae (1/1)
• Solanaceae (9/12)
• Tetragoniaceae (1/1)

Families containing insusceptible hosts

• Cucurbitaceae (1/1)
• Leguminosae-Papilionoideae (1/1)
• Solanaceae (3/12)

Physical and biochemical properties

Properties of particles in sap

Leaf sap contains many virions.

Purification method

Vetten et al. (1987).

Particle morphology

Virions filamentous; not enveloped; usually flexuous; with a clear modal length; of 553 nm. Axial canal obscure. Basic helix obvious.

Physical properties

A₂₆₀/A₂₈₀ ratio 1.26.

Features of proteins

Virion protein(s) one; M_r 27700; and it is coat protein. Method of preparation: Vetten et al. (1987).

Replication

Replication does not depend on a helper virus.

Cytopathology

Virions found in leaves, mesophyll and all parts of the host plant; in cytoplasm. Inclusions present in infected cells; are unusual in shape; cytoplasmic masses of filamentous virions mainly parallel or in whorls; they contain virions.

Taxonomy and relationships

Possible Potexvirus

Virus(es) with serologically related virions

Papaya mosaic (Argentine plantago and boussingaultia mosaic strains), hydrangea ringspot and potato X viruses.

Virus(es) with serologically unrelated virions

Brazilian cassava common mosaic, cymbidium mosaic, dioscorea latent, lily X, narcissus mosaic, potato aucuba mosaic, potato X and white clover mosaic potexviruses.

Best tests for diagnosis

In Tamus communis in England, potyviruses related to yam mosaic virus are common, but may be distinguished from this virus by serology and virion morphology.

Comments and References

References

• Vetten, H.J., Lesemann, D.-E. and Allen, D.J. (1987). Pl. Path. 36: 492.

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.