Abstract
Main conclusion
External application of dsRNA molecules from Tobacco mosaic virus (TMV) p126 and CP genes confers significant resistance against TMV infection. Exogenously applied dsRNA exhibits a rapid systemic trafficking in planta , and it is processed successfully by DICER-like proteins producing small interfering RNAs.
Abstract
RNA interference (RNAi) is a sequence-specific, post-transcriptional gene silencing mechanism, induced by double-stranded RNA (dsRNA), which protects eukaryotic cells against invasive nucleic acids like viruses and transposons. In the present study, we used a non-transgenic strategy to induce RNAi in Nicotiana tabacum cv. Xanthi plants against TMV. DsRNA molecules for the p126 (TMV silencing suppressor) and coat protein (CP) genes were produced by a two-step PCR approach followed by in vitro transcription. The application of TMV p126 dsRNA onto tobacco plants induced greater resistance against TMV infection as compared to CP dsRNA (65 vs. 50 %). This study also reported the fast systemic spread of TMV p126 dsRNA from the treated (local) to non-treated (systemic) leaves beginning from 1 h post-application, confirmed by both conventional and real-time RT-PCR. Furthermore, we employed a stem-loop RT-PCR and confirmed the presence of a putative viral siRNA for up to 9 days in local leaves and up to 6 days in systemic leaves post-application. The approach employed could represent a simple and environmentally safe way for the control of plant viruses in future agriculture.
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This work was supported by an Erasmus Mundus action BRAVE scholarship to Naga Charan Konakalla sponsored by European Union.
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Konakalla, N.C., Kaldis, A., Berbati, M. et al. Exogenous application of double-stranded RNA molecules from TMV p126 and CP genes confers resistance against TMV in tobacco. Planta 244, 961–969 (2016). https://doi.org/10.1007/s00425-016-2567-6
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DOI: https://doi.org/10.1007/s00425-016-2567-6