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00.056.0.00.006. Potato virus T

Cite this publication as: ICTVdB Management (2006). 00.056.0.00.006. Potato virus T. 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: Peru.

Host of Isolate and Habitat Details
Source of isolate: Solanum tuberosum.

Natural host and symptoms
Solanum tuberosum — usually symptomless but occasionally induces mild leaf mottling.

Reference to Isolation Report
Salazar and Harrison (1977).

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: 00.056.0.00.006. Virus accession number: 56000006. Obsolete virus code: 00.076.0.01.003.; 76.0.1.0.002; superceded accession number: 76001003; 76010002.
NCBI Taxon Identifier NCBI Taxonomy ID: 36403.

Name, Synonyms and Lineage

ICTV approved acronym: PVT. Virus has been taken out of the genus Trichovirus and has not been assigned to a particular genus. Virus is not assigned to a genus; of the 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 clear modal length with a length of 637 nm and a width of 12 nm. Axial canal is indistinct. Basic helix is obvious (when virions mounted in UA). Pitch of helix is 3.4 nm.

Electron microscopic preparation and references: Virus preparation contains few virions. Reference for electron microscopic methods: Salazar and Harrison (1978b).

Physicochemical and Physical Properties

There are 1 sedimenting component(s) found in purified preparations. The sedimentation coefficient is 99 S20w. The thermal inactivation point (TIP) is at 65°C (in Chenopodium quinoa sap). The longevity in vitro (LIV) is 2-4 days (at 20°C). Although the titer is dependent on the host, the decimal exponent (DEX) of the dilution end point is usually around 5.

Nucleic Acid

The Mr of the genome constitutes 95% of the virion by weight. The genome is monopartite. Only one particle size of linear, single-stranded RNA is recovered. The complete genome is 7500 nucleotides long, is partially sequenced and sequenced region is 7500 nucleotides long. Sequence has the accession number
[D10172] Gb(84)n:PVTGR Potato virus T genomic RNA, 3'-terminal region. 8/94 2,392bp. The genome has an intergenic poly (A) region at at the 3'terminus.

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

Proteins constitute about 5% of the particle weight.

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

Lipids

Lipids are not reported.

Transcription: The virus codes for 5-7 ORF(s).

Coding Strategy of Segment 1: Contains 5-7 ORF(s). Sequence has no gene blocks.

Antigenicity

The virus does not show serological relationships to apple chlorotic leafspot, potato M, potato S, potato X and potato Y viruses.

Biological Properties

Natural Host

Domain
Viral hosts belong to the Domain Eucarya.

Domain Eucarya
Kingdom Plantae.

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

Class Magnoliopsida (Dicotyledonae)
Subclass ASTERIDAE.

Severity and Occurrence of Disease

Host: Signs and symptoms disappear soon after infection.

Transmission and Vector Relationships

Virus is transmitted by mechanical inoculation; transmitted by grafting; not transmitted by contact between hosts; transmitted by seeds (10-72% in solanaceous hosts, transmitted by pollen to the seed.

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, Apocynaceae, Caryophyllaceae, Chenopodiaceae, Leguminosae-Papilionoideae, Solanaceae. The following species were susceptible to experimental virus infection: Beta vulgaris, Catharanthus roseus, Chenopodium album, Chenopodium amaranticolor, Chenopodium ambrosioides, Chenopodium foetidum, Chenopodium foliosum, Chenopodium murale, Chenopodium quinoa, Cyamopsis tetragonoloba, Datura metel, Datura stramonium, Datura tatula, Gomphrena globosa, Hyoscyamus niger, Lycopersicon chilense, Nicandra physalodes, Nicotiana benthamiana, Nicotiana clevelandii, Nicotiana debneyi, Nicotiana glutinosa, Nicotiana tabacum, Phaseolus vulgaris, Physalis floridana, Pisum sativum, Solanum rostratum, Solanum tuberosum, Spinacia oleracea, Stellaria media, Vicia faba, Vigna unguiculata, Vigna unguiculata ssp. sesquipedalis .

Experimentally infected insusceptible Hosts: Families containing insusceptible hosts: Amaranthaceae, Caryophyllaceae, or Compositae, Cruciferae, Cucurbitaceae, Gramineae, or Leguminosae-Papilionoideae, Solanaceae, Tetragoniaceae, Umbelliferae. Species inoculated with virus that do not show signs of susceptibility: Amaranthus caudatus, Apium graveolens, Brassica campestris, Cucumis sativus, Dianthus barbatus, Hordeum vulgare, Lactuca sativa, Lycopersicon esculentum, Petunia x hybrida, Tetragonia tetragonioides, Trifolium pratense, Triticum aestivum, Zea mays.

Diagnostic Hosts

Diagnostic host species and symptoms:

Chenopodium amaranticolor — systemic leaf necrosis.

C. quinoa — systemic leaf mosaic and tip necrosis.

Datura stramonium — mild systemic leaf chlorosis.

Nicotiana debneyi — leaf mottling and systemic necrosis.

Phaseolus vulgaris — necrotic local lesions and systemic necrosis.

Maintenance and Propagation Hosts

Most commonly used maintenance and propagation host species are Chenopodium quinoa.

Assay Hosts

Host: Assay hosts (for Local lesions or Whole plants):
Phaseolus vulgaris (L), Chenopodium amaranticolor (W).

References to host data: Salazar and Harrison (1978a).

Geographical Distribution

The virus spreads in South and Central Americas. The virus occurs in Bolivia and Peru.

Ecology, Epidemiology and Control

Studies reported by Salazar and Harrison (1978a).

References

Ochi, M., Kashiwazaki, S., Hiratsuka, K., Namba, S. and Tsuchizaki, T. (1992). Ann. Phytopath. Soc. Japan 58: 416.

Salazar, L.F. and Harrison, BD (1977). Nature, Lond. 265: 337.

Salazar, L.F. and Harrison, BD (1978a). Ann. appl. Biol. 89: 223.

Salazar, L.F. and Harrison, BD (1978b). CMI/AAB Descr. Pl. Viruses No. 187, 4 pp.
The following generic references are cited in the most recent ICTV Report.

PubMed References.

VIDEdB, the plant virus database developed at the Australian National University by Adrian J. Gibbs and collaborators, contains an earlier description with the number 648 by A.A. Brunt and L.F. Salazar, 1987.

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 187.



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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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