Short communication proposed “life cycle” of carnation small viroid-like RNA

Balázs, E. and Hegedűs, Krisztina (2012) Short communication proposed “life cycle” of carnation small viroid-like RNA. Acta Phytopathologica et Entomologica Hungarica, 47 (1). pp. 1-5. ISSN 0238-1249

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Abstract

Molecular characterization of proliferating carnation plant tissues revealed association with a pararetroviroid-like agent. Carnation small virod-like RNA termed as CarSV RNA is unique among plant viroidlike RNA s by having a homologous DNA counterpart in the plant genome. Previously, CarSV DNA related sequences had been detected in the plant genome fused to microsatellite-like genomic sequences. Here we present data that tissue proliferation symptoms can be seen only on those plants that are expressing the RNA form of this agent. As CarSV RNA adopts a hammerhead structure in both polarities and the plant genome naturally encodes a functional hammerhead ribozyme, it can be concluded that these ribozyme sequences are cleaved out from the plant genome. This could lead to the evolution of small RNA s that replicate autonomously by the rolling circle mechanism and later could spread horizontally by vegetative propagation of the plant material, or by using a hitchhiked plant pararetrovirus fused to its genome.

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