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00.015.0.05.007. Kalanchoe top-spotting virus

Cite this publication as: ICTVdB Management (2006). 00.015.0.05.007. Kalanchoe top-spotting 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: the United States of America.

Host of Isolate and Habitat Details
Source of isolate: Kalanchoe blossfeldiana.

Natural host and symptoms
Kalanchoe blossfeldiana — sunken circular yellow spots and occasional leaf deformation in intolerant cultivars.

Reference to Isolation Report
Hearon and Locke (1984).

Classification

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

ICTVdB Virus Code: 00.015.0.05.007. Virus accession number: 15005007. Obsolete virus code: 15.0.5.0.007; 07.0.1.0.007; superceded accession number: 15050007; 07010007.
NCBI Taxon Identifier NCBI Taxonomy ID: 218387.

Name, Synonyms and Lineage

Synonym(s): kalanchoe 'Commelina yellow mottle badnavirus'. ICTV approved acronym: KTSV. Virus is an ICTV approved species of the genus 00.015.0.05. Badnavirus in the family 00.015. Caulimoviridae.

Virion Properties

Morphology

Virions consist of a capsid. Virus capsid is not enveloped. Capsid is elongated and exhibits icosahedral symmetry. The capsid is bacilliform. The capsid shells of virions are composed of multiple layers. With a length of 130 nm and a width of 30 nm.

Electron microscopic preparation and references: Reference for electron microscopic methods: Lockhart and Ferji (1988).

Nucleic Acid

The genome is not segmented and contains a single molecule of circular. The genome is -RT. The genome is double-stranded DNA. The complete genome is 7350 nucleotides long. Genome is sequenced, but only an estimate is available, complete sequence is 7350 nucleotides long. The genome has terminally redundant sequences. The terminally redundant sequences have direct terminal repeats; are reiterated internally in inverted form.

GenBank records for nucleotide sequences; complete genome sequences.

Proteins

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

Non-Structural Proteins: The virus codes for an RNA-dependent DNA polymerase.

Lipids

Lipids are not reported.

Transcription: The virus codes for 3 ORF(s).

Translation: Replication involves a reverse transcription step.

Antigenicity

The virus does not show serological relationships to banana streak, cacao swollen shoot, Commelina yellow mottle, Dioscorea bacilliform, rice tungro bacilliform and sugarcane viruses.

The viral genome shows weak homology with those of banana streak and badnaviruses.

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 a vector. Virus is transmitted by mechanical inoculation; transmitted by seeds; transmitted by pollen to the seed.

Vector Transmission:
Virus is transmitted by arthropods, by insects of the order Hemiptera, family Pseudococcidae; Planococcus citri.

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 Crassulaceae. The following species were susceptible to experimental virus infection: Kalanchoe blossfeldiana.

Experimentally infected insusceptible Hosts: Families containing insusceptible hosts: Chenopodiaceae, Cucurbitaceae, or Leguminosae-Papilionoideae, Solanaceae. Species inoculated with virus that do not show signs of susceptibility: Chenopodium quinoa, Cucumis sativus, Nicotiana benthamiana, Nicotiana glutinosa, Phaseolus vulgaris, Pisum sativum.

Diagnostic Hosts

Diagnostic host species and symptoms:

Kalanchoe blossfeldiana — circular yellow spots in systemically infected leaves. Diagnostic host: insusceptible host species Chenopodium quinoa, Cucumis sativus, Nicotiana benthamiana, N. glutinosa, Phaseolus vulgaris.

Maintenance and Propagation Hosts

Most commonly used maintenance and propagation host species are Kalanchoe blossfeldiana.

Assay Hosts

Host: Assay hosts (for Local lesions or Whole plants):
Kalanchoe blossfeldiana (W).

Histopathology: Virus can be best detected in leaves and mesophyll. Virions are found in the cytoplasm.

Geographical Distribution

The virus occurs in the United Kingdom and the United States of America.

References

Hearon, S.S. and Locke, JC (1984). Phytopathology 74: 347.

Lockhart, B.E. and Ferji, Z. (1988). Acta Hort. 234: 73.

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 427 by A.A. Brunt, 1992.

Taxonomic Proposals and Changes

A taxonomic proposal has been submitted to the ICTV by the Plant Virus Subcommittee, Study Group for Caulimoviridae at the meeting in Strasburg, April 1997. The proposal has been approved at the meeting of the Executive Committee in Strasburg, 1997, the taxon has been removed from the Species (Badnavirus).



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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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