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三氯乙烯-四氯乙烯复合污染对大豆幼苗抗氧化特征的影响

发表时间:2010-06-30  浏览量:1164  下载量:387
全部作者: 黄媛媛,单爱琴
作者单位: 中国矿业大学江苏省资源环境信息工程重点实验室
摘 要: 通过室内模拟实验,研究三氯乙烯(trichloroethylene,TCE)、四氯乙烯(perchloroethylene,PCE)单一污染及TCE-PCE复合污染对大豆幼苗一系列生理学指标的影响。结果表明:TCE,PCE单一污染导致大豆幼苗体内超氧阴离子(O2-·)与脯氨酸的累积,当TCE,PCE浓度分别达到2.00,0.30 mg/kg时,脯氨酸明显累积;达到20.00,30.00 mg/kg胁迫时,O2-·含量明显增加。较低浓度TCE(≤2.00 mg/kg),PCE(≤0.30 mg/kg)胁迫会诱导幼苗体内超氧化物岐化酶(superoxide dismutase,SOD)与过氧化氢酶(catalase,CAT)活性升高,之后随胁迫浓度的升高,幼苗SOD与CAT活性下降甚至受抑制。与TCE,PCE单一污染相比,较高浓度复合污染对幼苗体内O2-·及脯氨酸累积具有明显的协同促进作用。较低浓度TCE-PCE复合污染对幼苗超氧化物歧化酶SOD,CAT活性的升高表现为协同促进作用;较高浓度复合污染对SOD活性的抑制表现为协同作用,对CAT活性的升高表现为拮抗作用。
关 键 词: 环境生物学;三氯乙烯;四氯乙烯;复合污染;大豆;抗氧化特征
Title: Effects of TCE-PCE combined pollution on soybean seedlings’ antioxidation characteristics
Author: HUANG Yuanyuan, SHAN Aiqin
Organization: Jiangsu Key Laboratory of Resources and Environmental Information Engineering, China University of Mining and Technology
Abstract: In this study, the stimulation experiments were conducted to study the effects of the trichloroethylene (TCE), perchloroethylene (PCE) single pollution and TCE-PCE combined pollution on a series of biological indexes of soybean seedlings. The results showed that TCE, PCE single pollution led to O2-·and proline accumulation. The contents of proline accumulated significantly when concentrations of TCE, PCE reached 2.00, 0.30 mg/kg separately. The contents of O2-·increased significantly when concentrations of TCE, PCE reached 20.00, 30.00 mg/kg separately. Lower concentrations of TCE (≤2.00 mg/kg), PCE (≤0.30 mg/kg) induced superoxide dismutase (SOD) and catalase (CAT) activities of seedlings to increase. Then the SOD and CAT activities of seedlings decreased or even inhibited with the increase of stress concentrations. The contents of O2-·and proline caused by TCE-PCE combined pollution was higher than that caused by TCE, PCE single pollution. Higher concentrations of TCE-PCE combined pollution on accumulation of O2-·and proline showed obvious synergistic effects. Lower concentrations of TCE-PCE combined pollution on SOD and CAT activities showed synergistic effects, while higher concentrations of combined pollution on SOD activities showed synergistic effects and the increase of CAT activities showed antagonistic effects.
Key words: environmental biology; trichloroethylene; perchloroethylene; combined pollution; soybean; antioxidation characteristics
发表期数: 2010年6月第12期
引用格式: 黄媛媛,单爱琴. 三氯乙烯-四氯乙烯复合污染对大豆幼苗抗氧化特征的影响[J]. 中国科技论文在线精品论文,2010,3(12):1228-1233.
 
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