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The development of insects is critically affected by temperature, which therefore plays an important role in the control of stored grain pests. Extreme temperature stress conditions lead to biological responses in mites, such as the synthesis of heat shock proteins.  Tyrophagus putrescentiae  ( Tp ) is a pest mite in stored grain that has negative effects on both economy and health. Since  T. putrescentiae  population dynamics are strongly influenced by temperature, in the present study we have cloned the cDNA of  HSP70  and  HSP90  (referred to as  TpHSP70-1 ,  TpHSP70-2  and  TpHSP90 ) and determined their expression by fluorescence real time quantitative PCR.  TpHSP70  and  TpHSP90  showed high homology with similar genes in other species and the open reading frames of  TpHSP70-1, TpHSP70-2  and  TpHSP90  encoded proteins of 665, 661 and 718 amino acid residues, respectively. Under thermal stress, expression of  TpHsp70-1  and  TpHsp90  was up-regulated at higher temperatures, suggesting their role in the defense against thermal stress.

Characteristic and expression of Hsp70 and Hsp90 genes from Tyrophagus putrescentiae and their response to thermal stress