【Abstract】 The treatment of wheat （ Triticum aestivum L.） seedlings with CaCl 2 increased mRNA levels of hsp26 gene at 37 ℃ for 1 h, while that with Ca 2+ chelator EGTA decreased the expression of the hsp26 gene. The expression of the wheat calmodulin gene CaM1₂ is rapidly up_regulated in wheat seedlings by heat shock at 37 ℃. The heat_induced up_regulation of CaM1₂ occurred earlier than that of the hsp26 gene did. Calmodulin antagonist N_{6aminohexyl5c}hloro_1naphthalenesulfonamid （W7） inhibited the expression of the hsp26 gene in wheat seedlings at 37 ℃ for 1 h. These results implied that the calcium_calmodulin is probably involved in the signal transduction of the hsp26 gene expression induced by heat shock.更多还原