Abstract
The spotted wing Drosophila (Drosophila suzukii) is an invasive and serious economic pest to small and stone fruits and its control is difficult. RNA interference (RNAi) or double-stranded RNA (dsRNA)-mediated gene silencing is rapidly becoming a widely used functional genomics tool in insects and holds great potential for insect pest control. This study investigates whether RNAi is functional in D. suzukii and whether oral delivery of dsRNA can elicit gene silencing and insecticidal activity. Firstly, microinjection of dsRNA targeting two essential genes (alpha COP and shrb) into the haemolymph of adult flies was performed, confirming that the RNAi system is functional and that gene silencing results in mortality. Secondly, dsRNA targeting alpha-COP and two extra essential genes, rpl13 and vha26, was mixed with artificial diet and fed to the larval and adult stages of D. suzukii. With naked dsRNA, no clear silencing and mortality were scored. However, combining dsRNA with a transfection reagent led to a significant increase in gene silencing and insect mortality. The best results were obtained with ds-Vha26. The results are discussed in relation to future optimization of the production, formulation, combinations and delivery of dsRNA.
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This research was supported by the Special Research Fund of Ghent University, the Fund for Scientific Research, Flanders (FWO Vlaanderen) and the Institute for Agricultural and Fisheries Research (ILVO)
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a Gene silencing efficiency in D. suzukii larvae 48 h post feeding assay with bacterially synthesized gene specific dsRNA targeting a single gene in a single treatment. The bars in the figure indicate different silencing efficiencies for the different target gene dsRNA treatments relative to the control group (ds-GFP treated group) with a silencing efficiency of zero (0 ± 4, 0 ± 3 and 0 ± 3 % for RPS13, alpha COP and Vha26, respectively. Values are based on 3 technical repetitions from 3 biological repetitions of 2 pooled insects. All target gene silencing efficiencies differed significantly from the control (gfp) (Bootstrapped median regression, p < 0.05). b Mortality in D. suzukii larvae following feeding assay with bacterially synthesized dsRNA targeting a single gene in a single treatment. The bars in the figure indicate the mean mortality ± standard error for the different dsRNA treatments targeting single genes (rps13, alpha COP and vha26) in one dsRNA treatment. Bars labelled with different letters indicate a significant difference in mean mortality rates (GLM, p < 0.05). No mortality was observed in the ds-GFP treated control group. Supplementary material 1 (PPTX 172 kb)
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a–c Gene silencing efficiency in D. suzukii larvae, 48 h post feeding assay with bacterially synthesized gene specific dsRNAs targeting two genes in a single treatment. The bars in the figure indicate different silencing efficiencies for the different target gene dsRNA treatments relative to the control group (ds-GFP treated group) with a silencing efficiency of zero (0 ± 3 and 0 ± 2 % for RPS13, 0 ± 2 and 0 ± 5 % for alpha COP and 0 ± 5 % and 0 ± 3 % for Vha26, respective to the bars in the figure a–c). Values are based on 3 technical repetitions from 3 biological repetitions of 2 pooled insects. All target gene silencing efficiencies differed significantly from the control (gfp) (Bootstrapped median regression, p < 0.05). d Mortality in D. suzukii larvae following feeding assays with bacterially synthesized gene specific dsRNAs targeting two genes in a single treatment. The bars in the figure indicate the mean mortality ± standard error for the different dsRNA treatments targeting two genes (rps13 + alpha COP, rps13 + vha26 and alpha COP + vha26) in one dsRNA treatment. Bars labelled with different letters indicate a significant difference in mean mortality rates (GLM, p < 0.05). No mortality was observed in the ds-GFP treated control group. Supplementary material 2 (PPTX 400 kb)
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Taning, C.N.T., Christiaens, O., Berkvens, N. et al. Oral RNAi to control Drosophila suzukii: laboratory testing against larval and adult stages. J Pest Sci 89, 803–814 (2016). https://doi.org/10.1007/s10340-016-0736-9
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DOI: https://doi.org/10.1007/s10340-016-0736-9