Gene silencing by RNAi via oral delivery of dsRNA by bacteria in the South American tomato pinworm, Tuta absoluta

Author(s)

Bento, Flavia M. M. ^{[1, 2]} ; Marques, Rodrigo N. ^[3] ; Campana, Felippe B. ^{[2, 4]} ; Demetrio, Clarice G. B. ^[1] ; Leandro, Roseli A. ^[1] ; Parra, Jose Roberto P. ^[1] ; Figueira, Antonio ^{[2, 4]}

Affiliation

^[1] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz ESALQ, Piracicaba - Brazil

^[2] Univ Sao Paulo, Ctr Energia Nucl Agr, Av Centenario 303, CP 96, BR-13400970 Piracicaba, SP - Brazil

^[3] Univ Fed Sao Carlos, Ctr Ciencias Agr, Araras - Brazil

^[4] Marques, Rodrigo N., Univ Fed Sao Carlos, Ctr Ciencias Agr, Araras, Brazil.Bento, Flavia M. M., Univ Sao Paulo, Ctr Energia Nucl Agr, Av Centenario 303, CP 96, BR-13400970 Piracicaba, SP - Brazil

• Document type: Journal article
• Source: Pest Management Science; v. 76, n. 1, p. 287-295, JAN 2020.
• Web of Science Citations: 0

Abstract

BACKGROUND: RNA interference (RNAi) has been evaluated in several insect pests as a novel strategy to be included in integrated pest management. Lepidopterans are recognized to be recalcitrant to gene silencing by RNAi. As such, double-stranded RNA (dsRNA) delivery needs to be adjusted to assure its stability until it reaches the target gene transcript for silencing. Gene silencing by RNAi offers the potential to be used in the control of Tuta absoluta (Meyrick), one of the main insect pests of tomato (Solanum lycopersicum) worldwide. Here, we tested the delivery of dsRNA expressed in Escherichia coli HT115(DE3) and supplied to larvae in an artificial diet by screening target genes for silencing. We tested six target genes: juvenile hormone inducible protein (JHP); juvenile hormone epoxide hydrolase protein (JHEH); ecdysteroid 25-hydroxylase (PHM); chitin synthase A (CHI); carboxylesterase (COE); and arginine kinase (AK). RESULTS: Based on larval mortality, the duration of the larval stage in days, pupal weight, and the accumulation of the target gene transcript, we demonstrated the efficacy of bacterial dsRNA delivery for the functional effects on larval development. Providing dsRNA targeted to JHP, CHI, COE and AK by bacteria led to a significant decrease in transcript accumulation and an increase in larval mortality. CONCLUSION: Bacteria expressing dsRNA targeting essential T. absoluta genes supplied in artificial diet are efficient to screen RNAi target-genes. The oral delivery of dsRNA by bacteria is a novel potential alternative for the control of T. absoluta based on RNAi. (c) 2019 Society of Chemical Industry (AU)

• FAPESP's process: 11/12869-6 - RNAi to control Tuta absoluta in tomato
• Grantee: Antonio Vargas de Oliveira Figueira
• Support Opportunities: Regular Research Grants