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. 1984 Dec 20;3(13):3055–3062. doi: 10.1002/j.1460-2075.1984.tb02257.x

Cloned single- and double-stranded DNA copies of potato spindle tuber viroid (PSTV) RNA and co-inoculated subgenomic DNA fragments are infectious.

M Tabler, H L Sänger
PMCID: PMC557816  PMID: 6549294

Abstract

A set of monomeric and oligomeric potato spindle tuber viroid (PSTV) specific DNA forms representing complete DNA copies of the circular PSTV RNA genome were constructed and cloned in plasmid pBR322 and bacteriophage M13. Both single- and double-stranded PSTV DNAs are capable of initiating viroid replication in mechanically inoculated tomato plants where it normally proceeds via the RNA-RNA pathway without DNA being involved. All dimeric and higher multimeric forms were infectious irrespective of their polarity in the case of single-stranded DNA and regardless of their orientation in the vector DNA in the case of double-stranded DNA. The vector-inserted monomeric PSTV DNA units were also found to be infectious but of low specific infectivity which was increased when these monomers had been excised. Even two subgenomic DNA fragments, representing together the 359 nucleotides of the PSTV RNA genome, initiated the synthesis of viroid RNA progeny when co-inoculated although each fragment by itself is non-infectious. These results are discussed with respect to the infectivity previously observed with certain cloned DNAs of conventional RNA and DNA viruses.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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