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Cd Pb单一及复合污染沉积物对铜锈环棱螺肝胰脏SOD和MT的影响

Keywords: ,,铜锈环棱螺,肝胰脏,超氧化物歧化酶,金属硫蛋白,联合作用,析因分析

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Abstract:

以实验室培养的铜锈环棱螺(Bellamyaaeruginosa)为测试生物,采用28d沉积物生物毒性测试研究了Cd、Pb单一及复合污染沉积物对铜锈环棱螺肝胰脏超氧化物歧化酶(SOD)活性和金属硫蛋白(MT)含量的影响,并分析了Cd和Pb对SOD和MT的联合作用特征。结果表明,Cd、Pb单一污染沉积物均对肝胰脏SOD活性具有显著的促进作用,且SOD活性随胁迫浓度的增加而升高,中、高浓度Pb胁迫下的SOD活性显著高于相应浓度的Cd胁迫。低浓度Cd、Pb单一胁迫对MT没有影响,中、高浓度Cd胁迫引起MT水平显著升高,而中、高浓度Pb胁迫导致MT水平显著下降。低、中和高浓度Cd-Pb复合胁迫均对肝胰脏SOD活性具有显著的促进作用,且SOD活性随胁迫浓度的增加而升高,但低于Cd、Pb单一胁迫下的SOD活性。低浓度Cd-Pb联合胁迫对MT没有影响,中、高浓度Cd-Pb联合胁迫导致MT含量显著升高。SOD对Cd-Pb联合胁迫的敏感性高于MT。析因分析表明,Cd-Pb对SOD的联合作用表现为拮抗作用;中、高浓度Cd-Pb对MT的联合作用表现为相加作用,其交互作用机理有待进一步研究。

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