Abstract

RNA interference (RNAi) is a naturally occurring process inhibiting gene expression, and recent advances in our understanding of the mechanism have allowed its development as a tool against insect pests. A major challenge for deployment in the field is the development of convenient and efficient methods for production of double stranded RNA (dsRNA). We assessed the potential for deploying bacterially produced dsRNA as a bio-pesticide against an invasive forest pest, the emerald ash borer (EAB). EAB feeds on the cambial tissue of ash trees (Fraxinus spp.), causing rapid death. EAB has killed millions of trees in North America since its discovery in 2002, prompting the need for innovative management strategies. In our study, bacterial expression and synthesis of dsRNA were performed with E. coli strain HT115 using the L4440 expression vector. EAB-specific dsRNAs (shi and hsp) over-expressed in E. coli were toxic to neonate EAB after oral administration, successfully triggering gene silencing and subsequent mortality; however, a non-specific dsRNA control was not included. Our results suggest that ingestion of transformed E. coli expressing dsRNAs can induce an RNAi response in EAB. To our knowledge, this is the first example of an effective RNAi response induced by feeding dsRNA-expressing bacteria in a forest pest.

Document Type

Article

Publication Date

7-14-2020

Notes/Citation Information

Published in Insects, v. 11, issue 7, 440.

© 2020 by the authors. Licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Digital Object Identifier (DOI)

https://doi.org/10.3390/insects11070440

Funding Information

This work was supported by the University of Kentucky, the USDA Forest Service Forest Health Research and Education Center, and the Kentucky Agricultural Experiment Station under McIntire–Stennis 2351197000 (LKRK), and is published with the approval of the director.

Related Content

Supplemental materials are available online at http://www.mdpi.com/2075-4450/11/7/440/s1.

Data is freely available via UKnowledge at https://doi.org/10.13023/sqyk-7x42.

insects-11-00440-s001.pdf (221 kB)
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