Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Beet 2 alphacryptovirus

Index

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

Data collated by R.F. White, 1986.

Nomenclature

Synonyms

beet cryptic virus.

Acronym

BCV-2

ICTV decimal code

49.0.3.0.004

Host range and symptoms

Natural host range and symptoms

Symptoms none.
• Beta vulgaris - no symptoms.

Transmission

Transmitted by means not involving a vector. Virus not transmitted by mechanical inoculation; not transmitted by grafting; not transmitted by contact between plants; transmitted by seed (up to 100% in sugar beet); transmitted by pollen to the seed.

Geographical distribution

Spreads in the Eurasian region. Found, but with no evidence of spread, in Australia, the Eurasian region, Japan and the U.S.A.

Experimental host range

Few (<3) families susceptible.

Maintenance and propagation hosts

Beta vulgaris.

Assay hosts (Local lesions or Whole plants)

none.

Susceptible host species

• Beta vulgaris

Insusceptible host species

• Chenopodium amaranticolor
• Chenopodium capitatum
• Chenopodium foetidum
• Chenopodium hybridum
• Chenopodium murale
• Chenopodium quinoa
• Cucumis sativus
• Gomphrena globosa
• Nicotiana clevelandii
• Nicotiana glutinosa
• Nicotiana tabacum
• Petunia × hybrida
• Vigna unguiculata ssp. sesquipedalis

Families containing susceptible hosts

• Chenopodiaceae (1/7)

Families containing insusceptible hosts

• Amaranthaceae (1/1)
• Chenopodiaceae (6/7)
• Cucurbitaceae (1/1)
• Leguminosae-Papilionoideae (1/1)
• Solanaceae (4/4)

Physical and biochemical properties

Properties of particles in sap

Leaf sap contains few virions.

Purification method

Kassanis et al. (1977); Accotto and Boccardo (1986).

Particle morphology

Virions isometric; not enveloped; 30 nm in diameter; rounded in profile, or angular in profile; without a conspicuous capsomere arrangement.

Physical properties

Usually one sedimenting component in purified preparations; sedimentation coefficient 120 S. Density 1.36-1.38 g cm^-3 in CsCl.

Biochemical properties

Genome consists of RNA; double-stranded. Total genome size 3.06 kb (pairs). Genome of two parts; largest (or only) genome part the larger 1.74 kb (pairs); the 2nd largest 1.32 kb (pairs).

Features of proteins

Virion protein(s) one; M_r 52500-54500. Method of preparation: Accotto and Boccardo (1986).

Cytopathology

Virions found in all parts of the host plant.

Taxonomy and relationships

Alphacryptovirus: Partitiviridae

Virus(es) with serologically unrelated virions

Alfalfa 1, carnation 1, carrot 1, fescue cryptic, garland chrysanthemum temperate, hop trefoil 1, radish yellow edge, red clover 1, rhubarb temperate, ryegrass, spinach temperate, vicia and white clover cryptic 1 and 3 alphacryptoviruses.

Additional comments on relationships

The genomic dsRNAs have no detectable homology with those of beet 1 alphacryptovirus.

Best tests for diagnosis

CDNA probes can be used to detect this virus in infected beet plants.

Comments and References

References

• Accotto, G.P. and Boccardo, G. (1986). J. gen. Virol. 67: 367.
• Antoniw, J.F., Linthorst, H.J.M., White, R.F. and Bol, J.F. (1989). J. gen. Virol. 67: 2047.
• Kassanis, B., White, R.F. and Woods, R.D. (1977). Phytopath. Z. 90: 350.
• Kassanis, B., Russell, G.E. and White, R.F. (1978). Phytopath. Z. 91: 6.
• Natsuaki, T., Natsuaki, K.T., Okuda, S., Teranaka, M., Milne, R.G., Boccardo, G. and Luisoni, E. (1986). Intervirology 31: 69.
• Xie, W., Antoniw, J.F. and White, R.F. (1989). Pl. Path. 38: 527.

Illustrations

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: 16^th January 1997.' URL http://biology.anu.edu.au/Groups/MES/vide/

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