| Autor: |
Worrall EA; Centre of Horticultural Science, Queensland Alliance of Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia., Bravo-Cazar A; Department of Plant Sciences, Cambridge University, Cambridge, United Kingdom., Nilon AT; Centre of Horticultural Science, Queensland Alliance of Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia., Fletcher SJ; Centre of Horticultural Science, Queensland Alliance of Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia., Robinson KE; Centre of Horticultural Science, Queensland Alliance of Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia., Carr JP; Department of Plant Sciences, Cambridge University, Cambridge, United Kingdom., Mitter N; Centre of Horticultural Science, Queensland Alliance of Agriculture and Food Innovation, The University of Queensland, Brisbane, QLD, Australia. |
| Abstrakt: |
Plant viruses are difficult to control, and they decrease both the quality and yield of crops, thus threatening global food security. A new approach that uses topical application of double-stranded RNA (dsRNA) to induce antiviral RNA-interference has been shown to be effective at preventing virus infection in a range of plants following mechanical inoculation. In this study, topical application of dsRNA was effective against mechanical inoculation and aphid-mediated inoculation with the potyvirus bean common mosaic virus (BCMV). Topical application of dsRNAs targeting either the coding region of the potyviral nuclear inclusion b (NIb) protein (BCMVNIb-dsRNA) or the coat protein (CP) coding region (BCMVCP-dsRNA) protected Nicotiana benthamiana and cowpea ( Vigna unguiculata ) plants against mechanical inoculation with BCMV. BCMVCP-dsRNA was selected for subsequent aphid transmission experiments. BCMVCP-dsRNA was loaded onto layered double hydroxide nanoparticles to form BCMVCP-BioClay which is a more stable formulation for delivering dsRNA than naked dsRNA. BCMVCP-BioClay was shown to be successful in protecting plants against BCMV transmission by the aphid Myzus persicae . Spraying detached N. benthamiana leaves with BCMVCP-BioClay 5 days prior to exposure to viruliferous aphids protected the leaves from infection by BCMV. Importantly, spraying of intact N. benthamiana and cowpea plants with BCMVCP-BioClay 5 days prior to exposure to viruliferous aphids protected plants of both species from BCMV infection. This study demonstrates that topical application of dsRNA using BioClay protects plants from aphid-mediated virus transmission, which is an important first step toward developing practical application of this approach in crop protection. |
