Selection of lethal genes for ingestion RNA interference against western flower thrips, Frankliniella occidentalis, via leaf disc-mediated dsRNA delivery.
Pestic Biochem Physiol
; 161: 47-53, 2019 Nov.
Article
em En
| MEDLINE
| ID: mdl-31685195
ABSTRACT
The western flower thrips, Frankliniella occidentalis, is a major pest that damages a wide variety of crops and vegetables. Following extensive use of insecticides, it has developed high levels of resistance to almost all groups of insecticides due to its high reproduction rate and short generation time. Therefore, an alternative pest control strategy, such as RNA interference (RNAi)-based control, is essential. To establish an ingestion RNAi-based control, a total of 57 genes involved in various biological processes were selected, and their double-stranded RNAs (dsRNA) were delivered to an insecticide-susceptible strain of F. occidentalis via the leaf disc-feeding method using a bioassay chamber optimized by 3D printing. The mortality of dsRNA-ingested thrips was examined every 24â¯h until 120â¯h post-treatment. Of the 57 genes screened, dsRNAs of the Toll-like receptor 6, apolipophorin, coatomer protein subunit epsilon and sorting and assembly machinery component were most lethal when ingested by thrips. The dsRNA-fed thrips showed substantially reduced transcription levels of target genes, demonstrating that the observed mortality was likely due to RNAi. When these genes were tested for ingestion RNAi against an insecticide-resistant strain of F. occidentalis, bioassay results were similar. In conclusion, this study provides the first evidence that ingestion RNAi can be lethal to F. occidentalis, a mesophyll sucking pest, and further suggests that transgenic plants expressing hairpin RNA of these essential genes can be employed to control insecticide-resistant thrips.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
RNA de Cadeia Dupla
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Interferência de RNA
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Tisanópteros
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Genes Letais
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Inseticidas
Limite:
Animals
Idioma:
En
Revista:
Pestic Biochem Physiol
Ano de publicação:
2019
Tipo de documento:
Article