镧、锌及其交互作用对浮萍活性氧清除系统的影响  

Effect of interaction of La and Zn on the reactive oxygen scavenging system in leaves of Lemna minor.

作　　者：马广岳[1] 施国新[1] 王学[1] 徐勤松[1] 王贵民[1] Rafeek Nhaled 

机构地区：[1]南京师范大学生命科学学院

出　　处：《农村生态环境》2004年第3期42-45,共4页Rural Eco-Environment

基　　金：国家自然科学基金资助项目(30370083);教育部科学技术研究重点项目(01043)

摘　　要：以浮萍(Lemnaminor)为材料,研究La、Zn及其交互作用对体内活性氧清除系统的影响,单独施加20mg·L-1的La或Zn对浮萍都有明显的伤害作用,且Zn的毒性远大于La。La、Zn复合处理不同程度地减弱各自的毒性,表现为植株叶绿素含量、蛋白质含量及过氧化氢酶(CAT)活性下降减缓;谷胱甘肽(GSH)、抗坏血酸(AsA)含量提高;超氧化物歧化酶(SOD)活性增强;过氧化物酶(POD)活性降低。各处理对浮萍的毒性由大到小的顺序依次为:Zn、La、Zn+La。Effects of single and combined pollution of La and Zn on reactive oxygen scavenging system in leaves of Lemna minor were studied.The results showed that both La and Zn,applied at a rate of 20 mg·L^(-1),caused obvious damage to Lemna minor,but the latter was much higher than the former in toxicity to the plant.Combined application of La and Zn weakened their respective toxicity to a varying extent,which was demonstrated in slower decline of chlorophyll and soluble protein content and CAT activity,higher GSH and AsA contents and SOD activity,as well as the decline of POD activity.So in terms of toxicity to Lemna minor,the three treatments were in a decreasing order of Zn,La,La+Zn.La and Zn may have interactive relieving effect,which is supposedly related to enhancement of the ability of the reactive oxygen scavenging system in the plant.

关 键 词：La ZN 胁迫 浮萍 交互作用 活性氧 

分 类 号：S555.9[农业科学—作物学] Q945.78[生物学—植物学]