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80. Viroids

Table ofContents

Taxonomy

Original Source and History of Virus
Virion Properties


Morphology
Physicochemical and Physical Properties
Nucleic Acid
Proteins
Lipids
Carbohydrates

Genome Organization and Replication

Infectivity
Replication
Function of Helper and Satellite Viruses
Cytopathology

Antigenic Properties

Serological Relationships
Diagnosis

Biological Properties

Symptoms and Host Range
Transmission
Geographic Distribution
Ecology and Control
Diagnostic and Methods

Taxonomic Structure
General Comments
References
Data sources and Contributors
Related Databases
Additional Data Sources and Teaching aids

Taxonomy

Virus Code. 80. Virus Accession number 80000000.


Comments: Viroids are unencapsidated, low molecular weight, circular, single-stranded infectious RNAs pathogenic to plants.

Sequences are the primary basis for comparison. The sequence of the central conserved region allows all characterised viroids to be classed into four groups. Variation occurs within each viroid "species" and an arbitrary level of 90% sequence similarity currently separates variants from species.

Virus infects plants.

Description is on taxonomic level of order (possibly), or family.

Properties of Virion

Morphology

No viral structures observed.

Biological Properties

Symptoms and Host Range

Host of virus belongs to the Domain Eucarya. Host of virus belongs to the Kingdom Plantae.

Taxonomic Structure

Taxonomic structure of the order, or family.
Genus Apscaviroid (VC 80.0.2. ),
Genus Avoviroid (VC 81.0.1. ) (was 80.0.3.0.001),
Genus Cocaviroid (VC 80.0.5. ),
Genus Coleviroid (VC 80.0.4. ),
Genus Hopstuviroid (VC 80.0.3. ), and
Genus Pospiviroid (VC 80.0.1. ).
Type species: 80.0.1.0.001 potato spindle tuber viroid (PSTV).
Species: Viroids are grouped using core sequence affinities: 80.0.2.0.001 apple scar skin (ASSVd) 330 nt, ASSVd group; 80.0.2.0.002 Australian grapevine (AGVd) 369 nt, ASSVd group; 80.0.3.0.001 avocado sunblotch (254) (ASBVd) 247 nt, ASBVd group; 80.0.U.0.001 Burdock stunt (BSVd) n.a.; 80.0.1.0.002 Chrysanthemum stunt (CSVd) 356 nt, PSTVd group; 80.0.1.0.003 citrus exocortis (226) (CEVd) 370- 375 nt, PSTVd group; 80.0.1.0.004 coconut cadang-cadang (287) (CCCVd) 246 nt, PSTVd group; 80.0.1.0.005 coconut tinangaja (CTiVd) 254 nt, PSTVd group; 80.0.U.0.002 Coleus blumei (CbVd1) n.a.; 80.0.U.0.003 Coleus blumei (CbVd2) n.a.; 80.0.U.0.004 Coleus blumei (CbVd3) 248 nt; 80.0.U.0.005 Coleus blumei (CbVd) n.a.; 80.0.1.0.006 Columnea latent (CLVd) 370 nt, PSTVd group; 80.0.2.0.003 grapevine yellow speckle 1 (GYSVd 1) 367 nt, ASSVd group; 80.0.2.0.004 grapevine yellow speckle 2 (GYSVd 2 +) 363 nt, ASSVd group; 80.0.1.0.006 hop latent (HLVd) 256 nt, PSTVd group; 80.0.1.0.007 hop stunt (326)* (HSVd) 297-303 nt, PSTVd group; 80.0.U.0.006 peach latent mosaic (PLMVd) n.a.; 80.0.1.0.001 potato spindle tuber (66) (PSTVd) 359 nt, PSTVd group; 80.0.1.0.007 tomato apical stunt (TASVd) 360 nt, PSTVd group; 80.0.U.0.007 tomato bunchy top (TBTVd) n.a.; 80.0.1.0.008 tomato planto macho (TPMVd) 360 nt, PSTVd group; (* Agent also of cucumber pale fruit, dapple fruit of plum and peach, and isolated from citrus and grapevine; n.a. not available; + synonymous with GVd1B (Koltunow et al., 1989).
Tentative species: 80.0.T.0.001 Brazilian coleus viroid; 80.0.T.0.002 carnation stunt viroid; 80.0.T.0.003 Chrysanthemum chlorotic mottle viroid; 80.0.T.0.004 citrus viroids.

References

The following references are cited in the ICTV Report : rf_viroi.htm.

Data sources and contributors.

The above description has been compiled from the data presented in the Sixth ICTV Report by Flores R.

The description has been generated automatically from DELTA files.

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

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Last updated: 15 June 2004 by Cornelia Büchen-Osmond
Web Page generated from ICTVdB by the DELTA systems.

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