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Journal of Virology, December 2002, p. 13094-13096, Vol. 76, No. 24
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.24.13094-13096.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Two Chloroplastic Viroids Induce the Accumulation of Small RNAs Associated with Posttranscriptional Gene Silencing

A. E. Martínez de Alba, R. Flores,* and C. Hernández

Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), Universidad Politécnica de Valencia, 46022 Valencia, Spain

Received 16 May 2002/ Accepted 18 September 2002

In plants, posttranscriptional gene silencing (PTGS) has been reported for cytoplasmic RNAs from endogenous nuclear genes, transgenes, viruses, and, recently, for a viroid with nuclear replication and accumulation. However, phenomena of this kind have not been described for mitochondrial or chloroplastic RNAs. Here we show that viroids that replicate and accumulate in the chloroplast are also targets of PTGS and this process may control viroid titer.

* Corresponding author. Mailing address: Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), Universidad Politécnica de Valencia, Ave. de los Naranjos s/n, 46022 Valencia, Spain. Phone: 34-96-3877861. Fax: 34-96-3877859. E-mail: rflores{at}ibmcp.upv.es.

Journal of Virology, December 2002, p. 13094-13096, Vol. 76, No. 24
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.24.13094-13096.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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