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镉对克氏原螯虾肝胰腺触角腺及鳃中SOD和CAT活性的影响

Keywords: Cd2+,克氏原螯虾,超氧化物歧化酶,过氧化氢酶,肝胰腺,,触角腺

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Abstract:

采用急性毒性实验方法,将克氏原螯虾分别暴露在浓度为7.5、10、15、30mg·L-1的Cd2+溶液中96h,实验期间对肝胰腺、触角腺、鳃等组织的超氧化物歧化酶(SOD)、过氧化氢酶(CAT)活力及随时间变化进行了检测。结果表明,在10mg·L-1Cd2+胁迫下,肝胰腺和触角腺中SOD和CAT活力在胁迫初期急剧升高,72h后降低并趋于稳定,而鳃中SOD和CAT两种酶的活力在96h内变化不显著(P>0.05);当Cd2+浓度为30mg·L-1时,肝胰腺、触角腺和鳃中的SOD、CAT酶活力显著受到了抑制(P<0.05)。通过比较发现,克氏原螯虾鳃中SOD和CAT活力要明显低于肝胰腺和触角腺中这两种酶的活力(P<0.05),并且肝胰腺和触角腺对Cd2+的应激反应要比鳃更为敏感。由以上结果可以看出,肝胰腺和触角腺中的抗氧化酶系统在Cd2+胁迫初期发挥了一定的抵御作用,而到后期抗氧化酶活性明显受到了抑制;另外低浓度的镉(7.5mg·L-1)对肝胰腺和触角腺中的SOD和CAT酶活起到了激活作用,而高浓度的镉(30mg·L-1)对3个组织中的抗氧化酶起到了明显的抑制作用。

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