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蚯蚓(Eisenia fetida)细胞色素P450及抗氧化酶系对环境浓度苯并(a)芘的响应

Keywords: 土壤,蚯蚓,P450,抗氧化酶系,苯并(a)芘[B(a)P]

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Abstract:

以赤子爱胜蚓(Eiseniafetida)为供试生物,草甸棕壤为供试土壤,以蚯蚓微粒体细胞色素P450含量、抗氧化酶系以及谷胱甘肽转移酶活性为指标,进行了土壤中苯并(a)芘B(a)P暴露与酶活性的量-效关系研究。结果表明,在接近沈抚灌区实地污染状况B(a)P(0.1~2.0mg·kg-1)暴露下,第1、3、7以及第14d取样时,P450和SOD有较好的响应:SOD在第1、3d显著升高,而在第7、14d时降低;P450总体表现为低浓度B(a)P诱导下降低,高浓度下升高的趋势。CAT、POD以及GST的敏感性相对较差。比照其他4个指标,蚯蚓P450的敏感性更为优异,具有较好的应用前景。指标敏感性总体表现为:P450>SOD>CAT/POD>GST。

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