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00.049.0.03.013. Ryegrass cryptic virus

Cite this publication as: ICTVdB Management (2006). 00.049.0.03.013. Ryegrass cryptic virus. In: ICTVdB - The Universal Virus Database, version 4. Büchen-Osmond, C. (Ed), Columbia University, New York, USA

Cite this site as: ICTVdB - The Universal Virus Database, version 4. http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/

Table of Contents

Isolate Description

Location: the United Kingdom.

Host of Isolate and Habitat Details
Source of isolate: Lolium multiflorum, (unknown cultivar) which may have also contained ryegrass mosaic virus.

Natural host and symptoms
Lolium perenne, Lolium multiflorum, Lolium multiflorum x L. perenne — symptomless but may enhance symptoms of ryegrass mosaic virus in some cultivars.

Reference to Isolation Report
Plumb (1973).

Classification

This is a description of a plant virus at the species level.

ICTVdB Virus Code: 00.049.0.03.013. Virus accession number: 49003013. Obsolete virus code: 49.0.3.0.013; superceded accession number: 49030013.
NCBI Taxon Identifier NCBI Taxonomy ID: 319460.

Name, Synonyms and Lineage

Synonym(s): ryegrass spherical cryptic virus. ICTV approved acronym: RGCV. Virus is an ICTV approved species of the genus Alphacryptovirus ; family 00.049. Partitiviridae.

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped, round with icosahedral symmetry. The nucleocapsid is isometric and has a diameter of 29-30 nm. Capsids appear round. The capsomer arrangement is not obvious.

Electron microscopic preparation and references: Virus preparation contains few virions (or very few virions; more virions in plants also infected with ryegrass mosaic virus). Repeated testing with ISEM necessary to ensure that preparation is free of other viruses. Reference for electron microscopic methods: extract sap in distilled water, heat 40°C for 10 minutes, then purify through differential centrifugation.

Nucleic Acid

The genome is segmented; bipartite, segements are distributed among 2 particle types of linear, double -stranded RNA. The multipartite genome is possible packaged in one particle, but it is not known whether they are packaged together or separately.

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

The viral genome encodes structural proteins.

Lipids

Lipids are not reported.

Antigenicity

The virus does not show serological relationships to beet cryptic and carnation cryptic viruses.

Biological Properties

Natural Host

Domain
Viral hosts belong to the Domain Eucarya.

Domain Eucarya
Kingdom Plantae.

Kingdom Plantae
Phylum Magnoliophyta (Angiosperms, Class Liliopsida (Monocotyledonae).

Transmission and Vector Relationships

Virus is not transmitted by mechanical inoculation; not transmitted by contact between hosts; transmitted by seeds; transmitted by pollen to the seed.

Experimental Hosts and Symptoms

Under experimental conditions susceptibility to infection by virus is found in few families. Susceptible host species are found in the Family Gramineae. The following species were susceptible to experimental virus infection: Lolium multiflorum, Lolium multiflorum x L. perenne, Lolium perenne.

Histopathology: Virus can be best detected in leaves. Virions are found in the cytoplasm and nucleus.

Geographical Distribution

The virus occurs in Australia, Germany, Italy, and the United Kingdom.

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, AM. (1980). Proc. 3rd Conf. on Virus Diseases of Gramineae in Europe, p. 75. The following generic references are cited in the most recent ICTV Report.

PubMed References. A description of this taxon in VIDEdB, the plant virus database developed at the Australian National University by Adrian J. Gibbs and collaborators, contains an earlier description with the number 703 by P.L. Guy, 1987.



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DELTA - DEscription Language for TAxonomy developed by Dr Mike Dallwitz, Toni Paine and Eric Zurcher, CSIRO Entomology, Canberra, Australia. ICTVdB - The Universal Virus Database, developed for the International Committee on Taxonomy of Viruses by Dr Cornelia Büchen-Osmond is written in DELTA. The virus descriptions in ICTVdB are coded by, or using data from experts in the field of virology or members ICTV. The character list is the underlying code. All virus descriptions are based on the character list and natural language translations are automatically generated and formatted for display on the Web from the descriptions in DELTA-format. The description has been generated automatically from DELTA files. DELTA - DEscription Language for TAxonomy developed by Dr Mike Dallwitz, Toni Paine and Eric Zurcher, CSIRO Entomology, Canberra, Australia.

ICTVdB - The Universal Virus Database, developed for the International Committee on Taxonomy of Viruses (ICTV) by Dr Cornelia Büchen-Osmond, is written in DELTA. The virus descriptions in ICTVdB are coded by ICTV members and experts, or by the ICTVdB Management using data provided by the experts, the literature or the latest ICTV Report. The character list is the underlying code. All virus descriptions are based on the character list and natural language translations from the encoded descriptions are automatically generated and formatted for display on the Web.

Developer of the DELTA software: M. J. Dallwitz, T. Paine and E. Zurcher

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Last updated on 25 April 2006 by Cornelia Büchen-Osmond
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