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00.060.0.09. Oryzavirus

Cite this publication as: ICTVdB Management (2006). 00.060.0.09. Oryzavirus. 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

Classification

This is a description of a plant and invertebrate (viruses replicate in both hosts and are transmitted by viruliferous planthoppers to Poacea) virus at the genus level.

ICTVdB Virus Code: 00.060.0.09. Virus accession number: 060009GE. Obsolete virus code: 60.0.9.; superceded accession number: 60090000.
NCBI Taxon Identifier NCBI Taxonomy ID: 10992.

Name, Synonyms and Lineage

Synonym(s): Plant reovirus subgroup 3. Virus is of the family 00.060. Reoviridae.

Virion Properties

Morphology

Virions consist of a capsid, a core, and a nucleoprotein complex. Virus capsid is not enveloped. Capsid/nucleocapsid is round and exhibits icosahedral symmetry. The capsid is isometric. The capsid shells of virions are composed of a single inner capsid layer. The outer shell is not present. Capsids appear round. The capsid surface structure reveals a regular pattern with distinctive features. The capsomer arrangement is clearly visible, or is not obvious. Surface projections are distinct "B"-type spikes protruding from the 12 vertices. The spikes are 8-10 nm long, 23-26 nm wide at the base and 14-17 nm at the top, that overlie the core). Inner capsids consist of a 65-80 nm. The core subcore is spherical (and smooth with no spikes) with a diameter of 50 nm.

Only one species is recovered in preparations.

Electron microscopic preparation and references: Virus preparation contains few virions, or many virions.

Physicochemical and Physical Properties

There are 1 sedimenting component(s) found in purified preparations, or 2 sedimenting component(s) found in purified preparations. A260/A280 ratio is 1.8. The thermal inactivation point (TIP) is at 70-75-80°C. The longevity in vitro (LIV) is 3 days. Although the titer is dependent on the host, the decimal exponent (DEX) of the dilution end point is usually around 6-7.

Nucleic Acid

The genome is segmented and consists of ten segments of linear double-stranded RNA. Minor species of non-genomic nucleic acid are not found in virions. The complete genome is 26640-26650-26660 nucleotides long. RNA-1 is sequenced, and complete sequence is about 3850-3875-3900 nucleotides long. RNA-2 is sequenced, but only an estimate is available, complete sequence is 3820-3860-3900 nucleotides long. RNA-3 is sequenced, but only an estimate is given, complete sequence is 3800 nucleotides long. RNA-4 has been sequenced, but only an estimate is provided; complete sequence is 3700-3750-3800 nucleotides long. RNA-5 has been sequenced, but only an estimate is presented, complete sequence is 2700-2725-2750 nucleotides long. RNA-6 has been sequenced, but only an estimate is given, complete sequence is 2300-2450-2600 nucleotides long, has been sequenced, but only an estimate is presented; complete sequence is 1950 nucleotides long. RNA-8 has been sequenced, but only an estimate is available, complete sequence is 1900 nucleotides long. RNA-9 has been sequenced, complete sequence is about 1200 nucleotides long. RNA-10 has been sequenced, but only an estimate is available; complete sequence is 1160 nucleotides long. The 5'-terminal sequence has conserved regions; terminal repeats at the 5'-end are 6 nucleotides long (5' GAUAAA....GUGC 3'). The 3'-terminus has conserved nucleotide sequences; of 4 nucleotides in length; sequence has conserved regions; in some RNA segments (but different from those of phytoreoviruses or Fijiviruses).

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

The viral genome encodes structural proteins and non-structural proteins. Virions consist of 6 structural protein(s), or 8 structural protein(s).

Lipids

Lipids are absent.

Genome Organization and Replication

By itself, genomic nucleic acid is not infectious.

Translation: The genome replicates in cytoplasmic viroplasma.

Biological Properties

Natural Host

Domain
Viral hosts belong to the Domain Eucarya.

Domain Eucarya
Kingdom Plantae.

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

Severity and Occurrence of Disease

Host: Signs and symptoms persist.

Transmission and Vector Relationships

Virus is transmitted by a vector. Virus is transmitted by mechanical inoculation, or not transmitted by mechanical inoculation; not transmitted by grafting; not transmitted by contact between hosts; not transmitted by seeds; not transmitted by pollen.

Vector Transmission:
Virus is transmitted by arthropods, by insects of the order Hemiptera, family Delphacidae. Virus is transmitted in a persistent manner; retained when the vector moults; replicates in the vector; not transmitted congenitally to the progeny of the vector; does not require a helper virus for vector transmission.

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: Alopecurus aequalis, Echinochloa crus-galli, Echinochloa crus-galli var. formosensis, Echinochloa crus-galli var. oryzicola, Eleusine coracana, Hordeum vulgare, Imperata cylindrica, Imperata cylindrica var. major, Lolium multiflorum, Oryza latifolia, Oryza nivara, Oryza sativa, Setaria italica, Triticum aestivum, Zea mays.

Experimentally infected insusceptible Hosts: Families containing insusceptible hosts: Gramineae. Species inoculated with virus that do not show signs of susceptibility: Cynodon dactylon, Echinochloa colona, Eleusine indica, Hordeum vulgare, Leersia hexandra, Saccharum officinarum, Sorghum bicolor, Triticum aestivum.

Histopathology: Virions are found in the cytoplasm.

Cytopathology: Inclusions are present in infected cells. Inclusion bodies in the host cell are found in the cytoplasm. Cytoplasmic inclusions are viroplasma. Inclusions contain mature virions.

Geographical Distribution

The virus occurs in Bangladesh, or China, or India, or Indonesia, or Japan, or Malaysia, or the Philippines, or Sri Lanka, or Taiwan, or Thailand.

Taxonomic Structure of the Genus

Type species 00.060.0.09.001. Rice ragged stunt virus .

Species in the Genus

List of Species in the Genus.

Data Sources and Contributions

The description has been compiled from data in the ICTV Report presented by Holmes IH, Boccardo G, Estes MK, Furuichi MK, Hoshino Y, Joklik WK, McCrae M, Mertens PPC, Milne RG, Samal KSK, Shikata E, Winton JR, Uyeda I, Nuss DL.

References

The following generic references are cited in the most recent ICTV Report.

PubMed References.
A description of the virus is found in DPV, a database for plant viruses developed by the Association of Applied Biologists (AAB), with the number 294.

Taxonomic Proposals and Changes

Rice ragged stunt was suggested as new genus because it has a distinct morphology unlike any other reo-like virus (though it somewhat resembles 60.0.6. Cypovirus without the matrix protein). The size distribution of the 10 dsRNA segments is unlike that of other Reoviridae. No serological relationships with any other plant reo-like virus. On the other hand, the symptoms, cytopathology, vector type and number of RNA segments, are similar to those of Fijivirus.



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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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