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Ambient temperature is an important factor limiting the abundance and distribution of insects, and heat shock protein (Hsp) gene expression is sensitive to extremes of cold and heat. In order to explore the role of Hsps during thermal stress and development in Monochamus alternatus Hope (Coleoptera: Cerambycidae), we cloned and characterized full-length Hsp genes, including MaHsp60, MaHsp70, and MaHsp90. M. alternatus were exposed to different temperatures (−15, −5, 5, 15, 25, 35, and 40℃) for 1 h and was allowed to recover at 25℃ for 1 h. Following the treatments, we investigated the expression of the Hsps by quantitative real-time polymerase chain reaction. In third instar larvae, MaHsp60, MaHsp70, and MaHsp90 expression was upregulated in response to cold and heat, but the three Hsps were especially sensitive to heat, specifically at 35℃ and 40℃. After heating M. alternatus to 35℃, the expression of MaHsp60, MaHsp70, and MaHsp90 was higher than at 5℃ and 25℃ in nearly all developmental stages. MaHsp60, MaHsp70, and MaHsp90 expression was highest in later pupal, early adult, and early adult stages, respectively. These results suggest that compared with normal ambient temperatures, thermal stress could induce high expression of the three Hsps.

Overexpression of Three Heat Shock Proteins Protects Monochamus alternatus (Coleoptera: Cerambycidae) From Thermal Stress