Cu,Cd,Hg inhibited MDH activity in leaf and root, but low concentration of Cu,Cd,Hg enhanced MDH activity and isozymes expression in ear.

• Cu、Cd、Hg明显抑制小麦叶片和根系苹果酸脱氢酶(MDH)活性，而低浓度的Cu、Cd、Hg则对小麦幼穗MDH活性有显著诱导作用。