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00.065.0.02. Waikavirus

Cite this publication as: ICTVdB Management (2006). 00.065.0.02. Waikavirus. 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 virus at the genus level.

ICTVdB Virus Code: 00.065.0.02. Virus accession number: 065002GE. Obsolete virus code: 65.0.2.; superceded accession number: 65020000.
NCBI Taxon Identifier NCBI Taxonomy ID: 12050.

Name, Synonyms and Lineage

Synonym(s): rice tungro spherical virus group. Virus is of the family 00.065. Sequiviridae.

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped, round with polyhedral symmetry. The isometric capsid has a diameter of 29-29.66-30 nm. Capsids appear round, or hexagonal in outline. The capsomer arrangement is clearly visible, or is not obvious.

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

Physicochemical and Physical Properties

Virions have a buoyant density in CsCl of 1.48-1.55 g cm-3. There are 1 sedimenting component(s) found in purified preparations, or 2 sedimenting component(s) found in purified preparations. The sedimentation coefficient is 175-179-183 S20w. A260/A280 ratio is 0.73-1.28-1.83. The longevity in vitro (LIV) is 45 days.

Nucleic Acid

The Mr of the genome constitutes 0-28.5-42% of the virion by weight. The genome is monopartite. Only one particle size of linear, positive-sense, single-stranded RNA is recovered. The complete genome is 10600-10630-10670 nucleotides long. Genome is sequenced, but only an estimate is available, complete sequence is 10420-10560-10670 nucleotides long. The genome has a base ratio of 24 % guanine; 30 % adenine; 17 % cytosine; 29 % uracil. The 5'-end of the genome has a probably genome-linked protein (VPg). The 3'-terminus has a poly (A) tract.

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

Proteins constitute about 58-71.5-100% of the particle weight.

The viral genome encodes structural proteins. Virions consist of 1 structural protein(s), or 2 structural protein(s), or 4 structural protein(s).

Lipids

Lipids are not reported.

Genome Organization and Replication

By itself, genomic nucleic acid is infectious (however, infectivity is protease-sensitive).

Translation: Virions are associated with helper virus, but independent from its functions during replication. Virion acts as helper for another virus.

Biological Properties

Natural Host

Domain
Viral hosts belong to the Domain Eucarya.

Domain Eucarya
Kingdom Plantae.

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

Class Magnoliopsida (Dicotyledonae)
Subclass ROSIDAE.

Severity and Occurrence of Disease

Host: Signs and symptoms persist.

Transmission and Vector Relationships

Virus is transmitted by a vector. Virus is not transmitted by mechanical inoculation; 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 Aphididae, Cicadellidae. Virus is transmitted in a semi-persistent manner; lost by the vector when it moults; does not replicate in the vector; not transmitted congenitally to the progeny of the vector; can facilitate the vector transmission of another virus.

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 Cyperaceae, Gramineae, Pontederiaceae, Umbelliferae. The following species were susceptible to experimental virus infection: Anthriscus cerefolium, Anthriscus sylvestris, Axonopus compressus, Brachiaria mutica, Coriandrum sativum, Cynodon dactylon, Cyperus brevifolius, Cyperus difformis, Cyperus rotundus, Digitaria ciliaris, Digitaria sanguinalis, Echinochloa colona, Eleusine indica, Eragrostis tenella, Fimbristylis miliacea, Imperata cylindrica, Leersia hexandra, Monochoria vaginalis, Oryza australiensis, Oryza barthii, Oryza glaberrima, Oryza latifolia, Oryza longistaminata, Oryza nivara, Oryza perennis, Oryza sativa, Panicum miliaceum, Pennisetum glaucum, Setaria faberi, Setaria halepense, Setaria lutescens, Sorghum bicolor, Sorghum halepense, Sorghum vulgare var. sudanense, Triticum aestivum, Zea mays.

Experimentally infected insusceptible Hosts: Families containing insusceptible hosts: Gramineae, Umbelliferae. Species inoculated with virus that do not show signs of susceptibility: Avena sativa, Bupleurum rotundifolium, Cynodon dactylon, Dactylis glomerata, Daucus carota, Elytrigia repens, Eragrostis cilianensis, Eryngium planum, Hordeum vulgare, Lolium perenne, Oryza sativa, Paspalum dilatatum, Pastinaca sativa, Phleum pratense, Pimpinella anisum, Saccharum officinarum, Secale cereale, Stenotaphrum secundatum, Trinia glauca, Triticum aestivum.

Histopathology: Virions are found in the cytoplasm.

Cytopathology: Inclusions are present in infected cells, or not present in infected cells. Inclusion bodies in the host cell are found in the cytoplasm. Cytoplasmic inclusions are amorphous X-bodies, or viroplasma. Inclusions contain mature virions, or do not contain mature virions.

Geographical Distribution

The virus spreads in East Asia, or Eurasia. The virus occurs in China, or Japan, or the United Kingdom, or the United States of America.

Taxonomic Structure of the Genus

Type species 00.065.0.02.001. Rice tungro spherical 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 Mayo MA, Murant AF, Turnbull-Ross AD, Reavy B, Hamilton RI, Gingery RE.

References

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

PubMed References.

Images

Taxon images: • EM from IACR Rothamsted.



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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

ICTVdB and DELTA related References

Comments to ICTVdB Management
Last updated on 25 April 2006 by Cornelia Büchen-Osmond
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