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BREAKTHROUGH TECHNOLOGIES

Potato Virus X-Induced Gene Silencing in Leaves and Tubers of Potato¹

Programmes of Cell-to-Cell Communication (E.M.G., K.H., C.L.), Quality, Health and Nutrition (O.F-R., M.T.), Genome Dynamics (I.H.), Gene Expression (S.M.), and Plant-Pathogen Interaction (E.M.G., P.B.), Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, United Kingdom; and Institute of Cellular and Molecular Biology, Edinburgh University, Edinburgh EH9 3JR, United Kingdom (E.M.G., G.J.L.)

Virus induced gene silencing (VIGS) is increasingly used to generate transient loss-of-function assays and has potential as a powerful reverse-genetics tool in functional genomic programs as a more rapid alternative to stable transformation. A previously described potato virus X (PVX) VIGS vector has been shown to trigger silencing in the permissive host Nicotiana benthamiana. This paper demonstrates that a PVX-based VIGS vector is also effective in triggering a VIGS response in both diploid and cultivated tetraploid Solanum species. We show that systemic silencing of a phytoene desaturase gene is observed and maintained throughout the foliar tissues of potato plants and was also observed in tubers. Here we report that VIGS can be triggered and sustained on in vitro micropropagated tetraploid potato for several cycles and on in vitro generated microtubers. This approach will facilitate large-scale functional analysis of potato expressed sequence tags and provide a noninvasive reverse-genetic approach to study mechanisms involved in tuber and microtuber development.

² Both authors contributed equally to the work.

www.plantphysiol.org/cgi/doi/10.1104/pp.103.037507.

^* Corresponding author; e-mail clacom{at}scri.sari.ac.uk; fax 44–0–1382–562426.

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