| 模拟酸雨引起水体pH下降导致Zn对金鱼藻的毒害 |
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| 引用本文： | 刘华,吴国荣,周耀民,陆长梅,陈景耀.模拟酸雨引起水体pH下降导致Zn对金鱼藻的毒害[J].环境科学学报,2003,23(4):525-529. |
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| 作者姓名： | 刘华 吴国荣 周耀民 陆长梅 陈景耀 |
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| 作者单位： | 1. 南京师范大学生命科学学院
2. 南京师范大学化学与环境科学学院,南京,210097 |
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| 基金项目： | 国家自然科学基金项目(39770046)和江苏省自然科学基金项目(BK97107)共同资助 |
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| 摘 要： | 用模拟酸雨沉降方式研究了水体酸度增加条件下,50 mg@L -1Zn2+对金鱼藻的毒害,以探讨酸雨沉降下重金属对植物伤害的作用机理.结果表明,随着pH降低,金鱼藻的细胞膜透性增加,叶绿素含量和叶绿素a/b值逐渐降低,游离脯氨酸含量明显增加;O2与脂质过氧化产物丙二醛(MDA)含量,均随酸度增加而升高,且两者极显著性相关.在低pH下50 mg@L -1Zn对金鱼藻的胁迫过程中,过氧化物酶(POD)活性发生大幅度应激性升高;CAT活性则在pH3.5以下明显下降.金鱼藻对Zn的富集量在pH5.5时最高,随着酸度加大,富集量呈明显下降趋势.提示,酸度增加使Zn离子化程度升高,是Zn对金鱼藻细胞毒性趋于明显的直接原因之一.
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| 关 键 词： | 酸雨 水体 pH值 Zn 锌 金鱼藻 毒害 重金属 植物 |
| 文章编号： | 0253-2468(2003)04-0525-05 |
| 收稿时间： | 2002/6/24 0:00:00 |
| 修稿时间： | 2002年6月24日 |
Effects of Zn toxicity on Ceratophyllum demersum L under low pH value |
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| LIU hu,WU Guorong,ZHOU Yaomin,LU Changmei and CHEN Jingyao.Effects of Zn toxicity on Ceratophyllum demersum L under low pH value[J].Acta Scientiae Circumstantiae,2003,23(4):525-529. |
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| Authors: | LIU hu WU Guorong ZHOU Yaomin LU Changmei and CHEN Jingyao |
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| Institution: | College of Life Science, Nanjing Normal University,College of Life Science, Nanjing Normal University,College of Chemistry and Environment, Nanjing Normal University, Nanjing 210097,College of Life Science, Nanjing Normal University and College of Life Science, Nanjing Normal University |
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| Abstract: | Effects of 50mg·L-1 Zn2+ with increased on acidity Ceratophyllum demersum L were studied. The results showed that the contents of free proline, O2, MDA and permeability of cell membrane increased while chlorophyll contents decreased with decrease of pH value. POD was induced significantly by low pH value and CAT activity decreased evidently when pH value was less than 3.5. Accumulation of Zn by Ceratophyllum demersum L was the highest at pH5.5 and decreased with increase of acidity,indicating that the direct reason of increase Zn toxicity on Ceratophyllum demersum L was the Zn ionization's enhancement induced by acidity increase. |
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| Keywords: | low pH value Zn 2+ \Ceratophyllum demersum L toxicity |
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