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New Technologies of Insect Control That Act Through the Gut

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Molecular Physiology and Evolution of Insect Digestive Systems

Part of the book series: Entomology in Focus ((ENFO,volume 7))

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Abstract

In this chapter, we cover the new insect control techniques that target the intestinal tract and are not based on chemical insecticides. Crystal (Cry) and Cytolitic (Cyt) protein families from Bacillus thuringiensis (Bt) and related toxins are used worldwide for insect control. Their primary action is to lyse midgut epithelial cells via binding to specific brush border receptors and elicit the formation of pores or trigger a necrotic pathway, which leads to the destruction of the midgut. We discuss in some detail recent findings on their mode of action. The use of proteinaceous inhibitors expressed in transgenic plants directed to enzyme targets, such as endopeptidases, α-amylases, and polygalacturonases, is reviewed. The success of transgenic crop plants expressing Cry toxin genes has paved the way for the development of genetically modified plants expressing double-stranded RNA (dsRNA) and CRISPR/Cas that can suppress the expression of genes coding for selected vital proteins. We discuss the recent developments in dsRNA and CRISPR/Cas technologies for insect pest management focusing on their actions in insect midgut.

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Correspondence to Walter R. Terra .

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Terra, W.R., Ferreira, C., Silva, C.P. (2023). New Technologies of Insect Control That Act Through the Gut. In: Molecular Physiology and Evolution of Insect Digestive Systems. Entomology in Focus, vol 7. Springer, Cham. https://doi.org/10.1007/978-3-031-39233-7_15

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