Up-regulation of calmodulin involved in the stress response to cyantraniliprole in the whitefly, Bemisia tabaci (Hemiptera: Aleyrodidae).

Insect Science
Lei GuoDong Chu

Abstract

Cyantraniliprole is the first diamide insecticide to have cross-spectrum activity against a broad range of insect orders. The insecticide, like other diamides, selectively acts on ryanodine receptor, destroys Ca2+ homeostasis, and ultimately causes insect death. Although expression regulations of genes associated with calcium signaling pathways are known to be involved in the response to diamides, little is known regarding the function of calmodulin (CaM), a typical Ca2+ sensor central in regulating Ca2+ homeostasis, in the stress response of insects to the insecticide. In this study, we cloned and identified the full-length complementary DNA of CaM in the whitefly, Bemisia tabaci (Gennadius), named BtCaM. Quantitative real-time reverse transcription polymerase chain reaction-based analyses showed that the messenger RNA level of BtCaM was rapidly induced from 1.51- to 2.43-fold by cyantraniliprole during 24 h. Knockdown of BtCaM by RNA interference increased the toxicity of cyantraniliprole in whiteflies by 42.85%. In contrast, BtCaM expression in Sf9 cells significantly increased the cells' tolerance to cyantraniliprole as much as 2.91-fold. In addition, the expression of BtCaM in Sf9 cells suppressed the rapid increase of int...Continue Reading

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