Plant Viruses Online   

Descriptions and Lists from the VIDE Database

Ryegrass alphacryptovirus

Index

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

Data collated by P.L. Guy, 1987.

Nomenclature

Synonyms

ryegrass spherical cryptic virus.

Acronym

RGCV

ICTV decimal code

49.0.3.0.013

Host range and symptoms

Natural host range and symptoms

• Lolium perenne, Lolium multiflorum, Lolium multiflorum × L. perenne - symptomless but may enhance symptoms of ryegrass mosaic virus in some cultivars.

Transmission

Virus not transmitted by mechanical inoculation; not transmitted by contact between plants; transmitted by seed; transmitted by pollen to the seed.

Geographical distribution

Spreads in Australia, Germany, Italy, and the UK.

Experimental host range

Few (<3) families susceptible.

Susceptible host species

• Lolium multiflorum
• Lolium multiflorum × L. perenne
• Lolium perenne

Families containing susceptible hosts

• Gramineae (3/3)

Physical and biochemical properties

Properties of particles in sap

Leaf sap contains few virions (or very few virions; more virions in plants also infected with ryegrass mosaic virus). Electron microscopy: repeated testing with ISEM necessary to ensure that preparation is free of other viruses.

Purification method

Extract sap in distilled water, heat 40ºC for 10 minutes, then purify through differential centrifugation.

Particle morphology

Virions isometric; not enveloped; 29-30 nm in diameter; rounded in profile; without a conspicuous capsomere arrangement.

Biochemical properties

Genome consists of RNA; double-stranded.

Cytopathology

Virions found in leaves; in cytoplasm and in nuclei.

Taxonomy and relationships

Alphacryptovirus: Partitiviridae

Virus(es) with serologically unrelated virions

Beet cryptic and carnation cryptic viruses.

Comments and References

References

• Luisoni, E. and Milne, R.G. (1980). Proc. 3rd Conf. on Virus Diseases of Gramineae in Europe, p. 73.
• Plumb, R.T. and Lennon, A.M. (1980). Proc. 3rd Conf. on Virus Diseases of Gramineae in Europe, p. 75.

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.