Abstract
Groundnut bud necrosis disease and Papaya ring spot disease are devastating disease of tomato and papaya/cucumber. In order to develop transgenic resistance against these viruses, gene silencing approach was followed to target the conserved viral sequences for obtaining wide spectrum of resistance. Viral derived small non coding RNA was used to silence viral gene. To have efficient processing of hairpins, microRNA backbone has been used to harbour viral derived siRNA. An artificial microRNA having miRNA159a backbone harbouring 21-nt siRNA sequences from RNAi suppressor (GBNV–NSs and PRSV–Hc-Pro) genes were constructed. To establish the efficacy of these amiRNA constructs, transient expression assay were performed and attenuation of viral symptoms were observed on expression of artificial microRNA construct in infected plants. Our data demonstrate that expression of virus-specific siRNAs using artificial-miRNA is an effective and predictable approach to silence Groundnut bud necrosis virus (GBNV) and Papaya ringspot virus (PRSV).
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The financial support received from Indian Agricultural Research Institute (IARI), New Delhi for the facilities and financial support provided.
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SG, SP: conceived and designed the experiments. SG RRK: involved in designing of viral derived siRNAs, isolation of miR159a backbone from A. thaliana, construction of plant expression vectors, mobilization of constructs into Agrobacterium tumefaciens, transient expression assay, and virus bioassay. SG RRK VC SP: wrote the paper and edited the manuscript.
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Goswami, S., Kumar, R.R., Chinnusamy, V. et al. In planta silencing of NSs and Hc-Pro through RNAi constructs: to develop durable resistance. Ind J Plant Physiol. 22, 577–586 (2017). https://doi.org/10.1007/s40502-017-0344-6
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DOI: https://doi.org/10.1007/s40502-017-0344-6