Characterization of Multiple Heat-Shock Protein Transcripts from Cydia pomonella: Their Response to Extreme Temperature and Insecticide Exposure

The economically important fruit pest Cydia pomonella (L.) exhibits a strong adaptability and stress tolerance to environmental stresses. Heat-shock proteins (HSPs) play key roles in insects in coping with environmental stresses. However, little is known about the spatiotemporal expression patterns of HSPs and their response to stresses in C. pomonella. In this study, a thermal treatment recovery test was performed, and the expression profiles of a novel isolated HSP, named CpHSP40, and six CpHSPs were determined. Third-instar larvae were able to recover from cold shock (0 degrees C) and heat shock (40 degrees C). Escherichia coli BL21 (DE3) cells harboring recombinant pET-28a (+)-CpHSP40 plasmid showed significant temperature tolerance. CpHSPs were developmentally and tissue-specifically expressed. The responses of CpHSPs to 0 and 40 degrees C (with or without recovery) and insecticide exposure were varied. All of these indicated that the expression of HSPs plays a role in the development and in environmental adaptation in C. pomonella.