钕对铜绿微囊藻生长及生理特性的影响

以BG11培养基作为对照,通过室内模拟试验研究了不同质量浓度的Nd3+对铜绿微囊藻生长及生理特性的影响。结果表明,Nd3+浓度为0.1～2.0 mg/L时对铜绿微囊藻的生长具有不同程度的促进作用,且能增加叶绿素a和可溶性蛋白的含量,提高超氧化物歧化酶(SOD)、过氧化物酶(POD)和过氧化氢酶(CAT)的活性,降低丙二醛(MDA)的含量。当Nd3+浓度为1.0 mg/L时,藻细胞密度、叶绿素a和可溶性蛋白含量、POD和CAT的活性均达到峰值,MDA含量降至最低;当Nd3+为2.0 mg/L时,SOD活性达到最大值。而Nd3+浓度达5.0～20.0 mg/L时则会抑制铜绿微囊藻的生长,除MDA含量升高外,其余指标均降低。Nd3+浓度达到40.0 mg/L时,铜绿微囊藻的生长基本停止。

Effects of Neodymium on the Growth and Physiological Characteristics of Microcystic aeruginosa

By simulated test in the laboratory, effect of different concentrations of Nd3＋ on the growth,physiological characteristics of Microcystic aeruginosa were studied and BGll culture medium was served as the control.The results showed that the growth of Microcystic aeruginosa was stimulated at the lower concentrations of Nd3＋（0.1-2.0 mg/L）.Meanwhile,the contents of chlorophyll a and soluble protein,activities of superoxide dismutase（SOD） ,peroxidase（POD）and eatalase（CAT）were increased,but the content of malondialdehyde（MDA）was decreased.When the concentration of Nd3＋ was 1.0 mg/L, algae cell density, the contents of chlorophyll a and soluble protein, activities of POD and CAT all reached their peaks while the content of MDA reached the lowest level.Activity of SOD reached its most value at the concentration of 2.0 mg/L.Nd3＋inhibited the growth of Microcystic aeruginosa at the higher concentrations （5.0-20.0 mg/L）. The other indicator was decreased except that the content of MDA was increased.Microcystic aeruginosa stopped growing and tended to die with the concentration of Nd3＋ 40.0 mg/L.