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A Method for Developing RNAi-Derived Resistance in Cowpea Against Geminiviruses. | LitMetric
In plants, RNA interference (RNAi) is triggered by double-stranded RNA (dsRNA). Accordingly, various RNA silencing technologies involving hpRNA, artificial microRNA (miRNA), and virus-induced gene silencing (VIGS) are used for controlling the expression of genes. Such manipulations help understanding gene functions and crop improvement biotechnology. A typical hpRNA construct is comprised of an intron splicable perfect inverted repeat of the target gene sequences under the control of a strong promoter. Geminiviruses, especially Mungbean Yellow Mosaic India Virus (MYMIV) cause devastating diseases in legume plants including cowpea, incurring severe crop loss. RNAi, involving hpRNA construct as transgene, is used to control these diseases at the early stages of geminivirus infection in the host, preventing symptom development and viral DNA accumulation. In this chapter, we describe a detailed protocol for the identification of geminivirus isolates from the filed grown cowpea plants, characterization of virus isolates under the laboratory conditions, design and construct RNAi vectors for effective suppression of viral target genes, and consequent development of transgenic cowpea using Agrobacterium-mediated transformation protocol. These transgenics are subsequently evaluated for resistance to MYMIV.
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