研究论文
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
模拟酸雨引起水体pH下降导致Zn对金鱼藻的毒害
- Effects of Zn toxicity on Ceratophyllum demersum L under low pH value
- 基金项目：国家自然科学基金项目(39770046);江苏省自然科学基金项目(BK97107)资助
- 作者
- 单位
- 刘华
- 南京师范大学生命科学学院
- 吴国荣
- 南京师范大学生命科学学院
- 周耀民
- 南京师范大学化学与环境科学学院,南京 210097
- 陆长梅
- 南京师范大学生命科学学院
- 陈景耀
- 南京师范大学生命科学学院
- 摘要：用模拟酸雨沉降方式研究了水体酸度增加条件下,50mg·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ab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50mg·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.
- 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.
- Key words：low pH value Zn2+ \Ceratophyllum demersum L toxicity
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