Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Zygocactus Montana X (?) potexvirus

Index

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

Data collated by M. Chessin, 1989.

Nomenclature

Synonyms

zygocactus virus X, ZyV-58, cactus zygocactus virus.

ICTV decimal code

56.0.1.T.D.13

Host range and symptoms

Natural host range and symptoms

Symptoms persist.
• Zygocactus truncatus - reddening of pads.

Transmission

Virus transmitted by mechanical inoculation.

Geographical distribution

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

Experimental host range

Few (<3) families susceptible. Experimentally infected plants mostly show systemic mosaics, mottles, ringspots or necrosis.

Diagnostically susceptible host species and symptoms

• Atriplex hastata - systemic leaf mottling.
• Chenopodium quinoa - necrotic local lesions, systemic mosaic.
• Chenopodium polyspermum - systemic leaf mottling.
• Chenopodium album, C. giganteum, C. urbicum - chlorotic or necrotic local lesions; not systemic.
• Hablitzia tamnoides - chlorotic local lesions; systemic green flecking.

Diagnostically insusceptible host species

Amaranthus tricolor, Chenopodium capitatum, C. hybridum, C. foliosum, Datura stramonium, Gomphrena globosa, Nicotiana tabacum, N. rustica, N. sylvestris, Phaseolus vulgaris.

Maintenance and propagation hosts

Chenopodium quinoa.

Assay hosts (Local lesions or Whole plants)

Chenopodium quinoa (L).

Susceptible host species

• Amaranthus caudatus
• Atriplex hastata
• Chenopodium album
• Chenopodium giganteum
• Chenopodium polyspermum
• Chenopodium quinoa
• Chenopodium urbicum
• Hablitzia tamnoides
• Zygocactus truncatus

Insusceptible host species

• Amaranthus tricolor
• Chenopodium capitatum
• Chenopodium foliosum
• Chenopodium hybridum
• Datura stramonium
• Gomphrena globosa
• Nicotiana glutinosa
• Nicotiana rustica
• Nicotiana sylvestris
• Nicotiana tabacum
• Phaseolus vulgaris

Families containing susceptible hosts

• Amaranthaceae (1/3)
• Cactaceae (1/1)
• Chenopodiaceae (7/10)

Families containing insusceptible hosts

• Amaranthaceae (2/3)
• Chenopodiaceae (3/10)
• Leguminosae-Papilionoideae (1/1)
• Solanaceae (5/5)

Sources of host-range data

Giri (1974).

Physical and biochemical properties

Properties of particles in sap

TIP: 75-80 °C. LIV: 6-7 days. DEP: log₁₀ minus 5-6. Leaf sap contains many virions. Electron microscopy: PTA with 0.1% (w/v) bovine serum albumin.

Purification method

Cycles of differential and density gradient centrifugation in CsCl at c.100000 rpm for 12-18 hours.

Particle morphology

Virions filamentous; not enveloped; usually flexuous; with a clear modal length; of 519 nm (»10). Axial canal obscure. Basic helix obscure.

Physical properties

Two sedimenting components in purified preparations; sedimentation coefficient of the fastest 120-123 S (a component sedimenting at c.200S probably consists of virion aggregates).

Cytopathology

Virions found in mesophyll and epidermis; in cytoplasm. Inclusions present in infected cells; are unusual in shape; spindles; they contain virions.

Taxonomy and relationships

Possible Potexvirus

Virus(es) with serologically related virions

Potato X, cactus X and white clover mosaic viruses.

Virus(es) with serologically unrelated virions

Zygocactus potexvirus (Casper and Brandes, 1969), potato aucuba mosaic, clover yellow mosaic and narcissus mosaic viruses.

Comments and References

References

• Casper, R. and Brandes, J. (1969). J. gen. Virol. 5: 155.
• Chessin, M. and Giri, L. (1975). Phytopath. Z. 83: 40.
• Giri, L. (1974). Ph.D. Thesis, University of Montana, U.S.A.

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.