红树蚬体内氧化逆境标志物对SCCPs暴露的响应

发布时间：2018-01-23 02:04

本文关键词： 红树蚬短链氯化石蜡氧化逆境标志物　出处：《中国环境科学》2017年10期 　论文类型：期刊论文

【摘要】：实验室条件下,观测不同剂量-时间短链氯化石蜡(SCCPs)暴露下红树蚬(Polymesoda erosa)血液及鳃组织的4种氧化逆境标志物(SOD、CAT、GST酶活性及MDA含量)的响应特征.结果表明:在低浓度(0.5,1mg/L)和中浓度(5mg/L)胁迫组,血液和鳃组织SOD、GST酶基本表现为随胁迫时间延长,酶活性逐渐上升的趋势;高浓度(10,20mg/L)胁迫组SOD、GST酶在胁迫初期表现出很高的活性,之后逐渐下降.CAT酶在胁迫初期(1d)就表现出最高的酶活性,之后酶活性逐渐降低并最终受到抑制.低浓度胁迫组MDA含量呈现上升-下降-上升的趋势;中等浓度及以上胁迫组,MDA含量持续升高.抗氧化系统在低于5mg/L的SCCPs胁迫组能够有效发挥作用,而高于此浓度的胁迫组,抗氧化系统经过初期的应急反应后,随胁迫时间延长逐渐被破坏.本文还探讨了利用红树蚬作为指示生物的可行性.
[Abstract]:In the lab. Four oxidative stress markers (SOD) in blood and Gill tissues of Polymesoda erosa exposed to SCCPs at different dose-time were observed. The results showed that the SOD in blood and Gill tissues of the low concentration group and the middle concentration group were 0.5 mg / L and 5 mg / L, respectively. The enzyme activity of GST increased gradually with the extension of stress time. The activity of GST in high concentration 10 ~ 20 mg / L stress group was very high at the beginning of stress, and then decreased gradually. Cat enzyme showed the highest activity at 1 day after stress. After that, the enzyme activity gradually decreased and was eventually inhibited. The content of MDA in the low concentration stress group showed the trend of rising, decreasing and increasing. The content of MDA in the medium concentration and above stress group increased continuously. The antioxidant system could play an effective role in the SCCPs stress group with less than 5 mg / L, but higher than that in the stress group with this concentration. After the initial emergency response, the antioxidant system was destroyed gradually with the prolongation of stress time. The feasibility of using mangrove clam as indicator organism was also discussed in this paper.
【作者单位】：广西科学院广西红树林研究中心广西红树林保护与利用重点实验室;海洋环境与生态教育部重点实验室;中国海洋大学环境科学与工程学院;广西大学动物科学技术学院;
【基金】：广西自然科学基金项目(2016GXNSFBA380033) 广西科学院基本科研业务费资助(15YJ22HSL11)
【分类号】：X171.5
【正文快照】： 短链氯化石蜡(short-chain chlorinatedparaffins,SCCPs)是氯化石蜡家族中碳链长度为10~13个碳原子,含氯质量分数通常为30%~75%的一类复杂化合物[1].相对于中链氯化石蜡(碳链长度为14~17)和长链氯化石蜡(碳链长度为18~30),短链氯化石蜡因其更易从各类产品中释放入环境、更高的

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