抗性甜菜夜蛾Na-K-ATP酶、Ca-ATP酶和Ca-Mg-ATP酶对高效氯氟氰菊酯的敏感性

分别测定了甜菜夜蛾Spodoptera exigua敏感和抗高效氯氟氰菊酯品系神经系统Na-K-ATP酶、Ca-ATP酶和Ca-Mg-ATP酶的活力。结果表明,敏感和抗性品系Na-K-ATP酶活力差异不显著,而抗性品系Ca-ATP酶和Ca-Mg-ATP酶活力明显低于敏感品系。在浓度为1.0×10-8~1.0×10-3 mol/L时,高效氯氟氰菊酯对敏感和抗性品系Na-K-ATP酶、Ca-ATP酶和Ca-Mg-ATP酶的活力均有抑制,并且对敏感品系的抑制作用高于对抗性品系。高效氯氟氰菊酯浓度为1.0×10-4 mol/L 时,对敏感品系Na-K-ATP酶活力的抑制率为29.6%,对抗性品系的为21.8%,对敏感品系Ca-ATP酶活力的抑制率为34.3%,对抗性品系为21.9%,对敏感品系Ca-Mg-ATP酶活力的抑制率为22.3%,对抗性品系为16.9%,存在显著差异。表明甜菜夜蛾抗性品系上述3种ATP酶对高效氯氟氰菊酯的敏感性已明显下降。

Sensitivity of Nerve Na-K-ATPase, Ca-ATPase and Ca-Mg-ATPase in Resistant Strains of Spodoptera exigua to lambda-Cyhalothrin

The activity of Na-K-ATPase, Ca-ATPase and Ca-Mg-ATPase in susceptible and lambda-cyhalothrin resistant strains of beet armyworm, Spodoptera exigua, were determined. The results indicated that there was no significant difference in Na-K-ATPase activity between the two strains, but the activity of Ca-ATPase and Ca-Mg-ATPase were much lower in resistant strain than in susceptible strain. Lambda-cyhalothrin at concentrations of 1.0×10^-8~1.0×10^-3 mol/L inhibited obviously the three mentioned above ATPase activities in two strains, and the inhibition was higher in susceptible strain than in resistant strain. For example, at concentration of 1.0×10^-4 mol/L, the inhibition on Na-K-ATPase, Ca-ATPase and Ca-Mg-ATPase activities was 29.6%, 34.3% and 22.3% in susceptible strain and 21.8%, 21.9% and 16.9% in resistant strain,respectively. The results showed that the sensitivity of these three ATPases to lambda-cyhalothrin in resistant strain were decreased.