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Viroids: sequence variability and evolution of pathogenic RNA

Author

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  • J. Matoušek

    (Institute of Plant Molecular Biology Academy of Sciences of the Czech Republic, 370 05 České Budějovice, Czech Republic)

Abstract

Viroids as the smallest pathogenic circular single-stranded pathogenic RNAs form populations of quasi-species, whichhas been recently identified by thermodynamic methods like TGGE pre-selection and heteroduplex analysis. It was foundthat replication under thermal stress led to enormously high level of viroid mutagenesis. Mostly multiple mutants havingnon-random distribution of base changes were found. A specific "hot spots" were identified in the regions, wherea characteristic "pathogenicity domains" are localised in different viroids of the pospiviroidae family. Specific viroidmicroevolution was observed upon artificial inoculation of non-host plant species. Our results suggest that viroid propagationunder physiological stress can be assumed as important factor, which is among others, responsible for an appearanceof viroid quasi-species in the nature. Evolution and new viroid patotypes could accumulate due to environmental stressincluding various pollutants may be a potential danger for cultured plants.

Suggested Citation

  • J. Matoušek, 2002. "Viroids: sequence variability and evolution of pathogenic RNA," Plant Protection Science, Czech Academy of Agricultural Sciences, vol. 38(SI1-6thCo), pages 173-176.
    • Handle: RePEc:caa:jnlpps:v:38:y:2002:i:si1-6thconfefpp:id:10348-pps
    DOI: 10.17221/10348-PPS
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