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00.056.0.81.010. Malva veinal necrosis virus

Cite this publication as: ICTVdB Management (2006). 00.056.0.81.010. Malva veinal necrosis 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: Brazil.

Host of Isolate and Habitat Details
Source of isolate: Malva parviflora.

Natural host and symptoms
Malva parviflora, other Malva ssp. — veinal necrosis.

Reference to Isolation Report
Costa and Kitajima (1970).

Classification

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

ICTVdB Virus Code: 00.056.0.81.010. Virus accession number: 56081010. Obsolete virus code: 56.0.1.T.010; superceded accession number: 5601t010.

Name, Synonyms and Lineage

Synonym(s): malva veinal chlorosis virus. ICTV approved acronym: MVNV. Virus is a tentative member of the genus 00.056.0.01. Potexvirus; family 00.056. Flexiviridae.

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped. Capsid/nucleocapsid is elongated with helical symmetry. The capsid is filamentous, flexuous with a length of 525 nm and a width of 13 nm. Basic helix is obscure.

Electron microscopic preparation and references: Virus preparation contains few virions.

Physicochemical and Physical Properties

The thermal inactivation point (TIP) is at 70-75°C. Although the titer is dependent on the host, the decimal exponent (DEX) of the dilution end point is usually around 6.

Nucleic Acid

The genome is monopartite. Only one particle size of linear, positive-sense, single-stranded RNA is recovered.

Proteins

The viral genome encodes structural proteins and non-structural proteins.

Lipids

Lipids are not reported.

Transcription: The virus codes for 5 ORF(s).

Coding Strategy of Segment 1: Sequence has a gene block. Sequence has triple gene block sequence (TGB). Encodes proteins involved in cell to cell movement.

Biological Properties

Natural Host

Domain
Viral hosts belong to the Domain Eucarya.

Domain Eucarya
Kingdom Plantae.

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

Severity and Occurrence of Disease

Host: Signs and symptoms persist.

Transmission and Vector Relationships

Virus is transmitted by mechanical inoculation.

Experimental Hosts and Symptoms

Under experimental conditions susceptibility to infection by virus is found in several families. Susceptible host species are found in the Family Amaranthaceae, Chenopodiaceae, Malvaceae, Pedaliaceae, Tetragoniaceae. The following species were susceptible to experimental virus infection: Chenopodium amaranticolor, Chenopodium quinoa, Gomphrena globosa, Malva parviflora, Malva rotundifolia, Sesamum indicum, Tetragonia tetragonioides.

Host:
Experimentally infected hosts mainly show symptoms of systemic mosaics, mottles, ringspots or necrosis.

Experimentally infected insusceptible Hosts: Families containing insusceptible hosts: Malvaceae, Solanaceae. Species inoculated with virus that do not show signs of susceptibility: Abelmoschus esculentus, Datura stramonium, Gossypium hirsutum, Nicotiana glutinosa, Nicotiana tabacum, Physalis floridana, Solanum tuberosum.

Diagnostic Hosts

Diagnostic host species and symptoms:

Malva parviflora, M. rotundifolia — necrotic local lesions, then systemic veinal necrosis.

Gomphrena globosa — necrotic local lesions.

Chenopodium amaranticolor, C. quinoa — local lesions.

Sesamum indicum, Tetragonia tetragonioides.

Maintenance and Propagation Hosts

Most commonly used maintenance and propagation host species are Malva parviflora.

Assay Hosts

Host: Assay hosts (for Local lesions or Whole plants):
Malva parviflora (L,W), Chenopodium amaranticolor (L), Gomphrena globosa (L).

Geographical Distribution

The virus occurs in Brazil.

References

Costa, AS. and Kitajima, E.W. (1970). Bragantia 29: 51.

The following generic references are cited in the most recent ICTV Report.
VIDEdB, the plant virus database developed at the Australian National University by Adrian J. Gibbs and collaborators, contains an earlier description with the number 480 by A.A. Brunt, 1990 and E.W. Kitajima, 1991.



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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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