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00.077.0.02.002. Bermuda grass etched-line virus

Cite this publication as: ICTVdB Management (2006). 00.077.0.02.002. Bermuda grass etched-line 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: Morocco.

Host of Isolate and Habitat Details
Source of isolate: Cynodon dactylon and Sorghum halepense.

Natural host and symptoms
Cynodon dactylon — white etched lines and spots in leaves; plants stunted.

Sorghum halepense — chlorotic streaks in leaves.

Reference to Isolation Report
Lockhart et al. (1985).

Classification

This is a description of a plant virus at the species level with data on all virus properties from morphology to genome, replication, antigenicity and biological properties.

ICTVdB Virus Code: 00.077.0.02.002. Virus accession number: 77002002. Obsolete virus code: 00.041.0.01.002.; 41.0.1.0.002; superceded accession number: 41001002; 41010002.
NCBI Taxon Identifier NCBI Taxonomy ID: 167478.

Name, Synonyms and Lineage

ICTV approved acronym: BELV. Virus is an ICTV approved species of the genus 00.077.0.02. Marafivirus in the family 00.077. Tymoviridae.

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped, round with icosahedral symmetry. The isometric capsid has a diameter of c. 30 nm. Capsids appear round. The capsomer arrangement is clearly visible.

Electron microscopic preparation and references: Virus preparation contains many virions. Reference for electron microscopic methods: Lockhart et al. (1985).

Physicochemical and Physical Properties

Virions have a buoyant density in CsCl of 1.44 g cm-3 ((B)), or 1.29 g cm-3 ((T)). The density of virions is in Cs2SO4 1.40 g/ml (B) and 1.26 g/ml (T). There are 2 sedimenting component(s) found in purified preparations. The sedimentation coefficient is of the fastest 119 S20w ((B), of the other(s) are 57 S20w ((T)). A260/A280 ratio is 1.53 (B), or 0.88 (T).

Nucleic Acid

The genome is monopartite. Only one particle size of linear, single-stranded RNA is recovered. The complete genome is 7500 nucleotides long, is sequenced and complete sequence is about 7500 nucleotides long. The 3'-terminus has a subgenomic promoter, a conserved region known as "tymobox". Reference to nucleotide sequence isolation method by Lockhart: use standard phenol-SDS procedure.

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

The viral genome encodes structural proteins and non-structural proteins. Virions consist of 1 structural protein(s) located in the capsid.

Lipids

Lipids are not reported.

Antigenicity

The virus is serologically related to maize rayado fino and oat blue dwarf 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).

General Symptoms in Plants Virus affects the photosynthetic system. Symptoms are expressed in the leaf include chlorosis and development of patterns or markings that are visible in the leaf margin and venation. Intercostal regions show change in color. Leaf margin can be changed in color. Leaf veins are changed in color. Include vein banding. Leaves with striations.

Severity and Occurrence of Disease

Host: Signs and symptoms persist and vary seasonally.

Transmission and Vector Relationships

Virus is transmitted by a vector. Virus is not transmitted by mechanical inoculation; not transmitted by seeds.

Vector Transmission:
Virus is transmitted by arthropods, by insects of the order Hemiptera, family Cicadellidae; Aconurella prolixa. Virus is transmitted in a persistent manner; replicates in the vector.

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: Avena sativa, Bromus inermis, Cynodon dactylon, Festuca arundinacea, Sorghum bicolor, Sorghum halepense, Triticum durum, Zea mays.

Host:
Experimentally infected hosts mainly show symptoms of streaks.

Experimentally infected insusceptible Hosts: Families containing insusceptible hosts: Gramineae. Species inoculated with virus that do not show signs of susceptibility: Agrostis alba, Echinochloa crus-galli, Elytrigia repens, Hordeum vulgare, Lolium perenne, Panicum dichotomiflorum, Phalaris arundinacea, Saccharum officinarum, Secale cereale, Setaria viridis.

Diagnostic Hosts

Diagnostic host species and symptoms:

Avena sativa, Cynodon dactylon, Triticum durum, Zea mays, Sorghum bicolor, S. halepense — chlorotic spots and lines. Diagnostic host: insusceptible host species Agrostis alba, Elytrigia repens, Hordeum vulgare, Lolium perenne, Saccharum officinarum, Setaria viridis.

Maintenance and Propagation Hosts

Most commonly used maintenance and propagation host species are Cynodon dactylon, Zea mays.

Assay Hosts

Host: Assay hosts (for Local lesions or Whole plants):
Cynodon dactylon (W), Zea mays (W).

References to host data: Lockhart et al. (1985).

Histopathology: Virus can be best detected in leaves, mesophyll, epidermis, vascular parenchyma and all parts of the host plant. Virions are found in the cytoplasm and cell vacuole.

Cytopathology: Inclusions are not present in infected cells.

Geographical Distribution

The virus occurs in Morocco.

Ecology, Epidemiology and Control

Studies reported by Lockhart et al. (1985).

References

Lockhart, B.E.L., Khaless, N., Lennon, AM. and El Maataoui, M. (1985). Phytopathology 75: 1258.

Khaless, N. (1988). M.Sc. Thesis, University of Minnesota, 53 pp.

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 95 by A.A Brunt and B.E.L. Lockhart, 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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