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ICTVdB
Virus Descriptions

Descriptions are generated automatically from the ICTVdB database including links. Some descriptions are only very basic and links may therefore be pointing to sections that are not yet described. Links to other descriptions may also point to a document that has not yet been published.
80.0.1 Viroids

Introduction

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 characterized 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. Description is on the taxonomic level of order (possibly). Taxa included in this taxon: Groups: 80.0.1 PSTV Potato spindle tuber viroid; 80.0.2 ASSVd Apple scar skin viroid; 80.0.3 ASBVd Avocado sunblotch viroid. Type species: 80.0.1.0.01 Potato spindle tuber viroid (PSTV). Viroids are grouped using core sequence affinities: 80.0.2.0.01 Apple scar skin (ASSVd) 330 nt, ASSVd group; 80.0.2.0.02 Australian grapevine (AGVd) 369 nt, ASSVd group; 80.0.3.0.01 Avocado sunblotch (254) (ASBVd) 247 nt, ASBVd group; 80.0.U.0.01 Burdock stunt (BSVd) n.a.; 80.0.1.0.02 Chrysanthemum stunt (CSVd) 356 nt, PSTVd group; 80.0.1.0.03 Citrus exocortis (226) (CEVd) 370- 375 nt, PSTVd group; 80.0.1.0.04 Coconut cadang-cadang (287) (CCCVd) 246 nt, PSTVd group; 80.0.1.0.05 Coconut tinangaja (CTiVd) 254 nt, PSTVd group; 80.0.U.0.02 Coleus blumei (CbVd1) n.a.; 80.0.U.0.03 Coleus blumei (CbVd2) n.a.; 80.0.U.0.04 Coleus blumei (CbVd3) 248 nt; 80.0.U.0.05 Coleus blumei (CbVd) n.a.; 80.0.1.0.06 Columnea latent (CLVd) 370 nt, PSTVd group; 80.0.2.0.03 Grapevine yellow speckle 1 (GYSVd 1) 367 nt, ASSVd group; 80.0.2.0.04 Grapevine yellow speckle 2 (GYSVd 2 +) 363 nt, ASSVd group; 80.0.1.0.06 Hop latent (HLVd) 256 nt, PSTVd group; 80.0.1.0.07 Hop stunt (326)* (HSVd) 297-303 nt, PSTVd group; 80.0.U.0.06 Peach latent mosaic (PLMVd) n.a.; 80.0.1.0.01 Potato spindle tuber (66) (PSTVd) 359 nt, PSTVd group; 80.0.1.0.07 Tomato apical stunt (TASVd) 360 nt, PSTVd group; 80.0.U.0.07 Tomato bunchy top (TBTVd) n.a.; 80.0.1.0.08 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 members: 80.0.T.0.01 Brazilian coleus viroid; 80.0.T.0.02 Carnation stunt viroid; 80.0.T.0.03 Chrysanthemum chlorotic mottle viroid; 80.0.T.0.04 Citrus viroids. Taxon infects plants.

Properties of Virion

Morphology. Virions not found.

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

ICTVdB and DELTA related References

Last updated: 15 June 2004 by Cornelia Büchen-Osmond
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