稀土Y^(3+)对铜绿微囊藻生长及其抗氧化酶活性的影响

Effects of Yttrium(Y^(3+)) on Growth and Antioxidant Enzyme of Microcystis aeruginosa

为探讨钇(Y3+)质量浓度对铜绿微囊藻(Microcystis aeruginosa)的生长及其抗氧化酶含量变化的影响,以铜绿微囊藻FACHB912为试材,研究了不同质量浓度的外源稀土Y3+对藻细胞生长、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性、丙二醛(MDA)含量的影响。结果表明,低质量浓度的Y3+(0.05～0.20mg/L)对铜绿微囊藻生长表现出明显促进作用,而高质量浓度(0.50～10.00mg/L)则部分或完全抑制了藻细胞的正常生长;在Y3+初始质量浓度为0.50～10.00mg/L时,藻细胞丙二醛(MDA)含量急剧增加,抗氧化酶活性均下降,藻细胞清除活性氧(ROS)能力减弱,抗氧化防御体系被破坏,膜脂过氧化严重,严重抑制藻细胞生长。

In order to study the impact of different initial yttrium（Y3＋） concentrations on the growth and the content of antioxidant enzymes of Microcystis aeruginosa,the M.aeruginosa FACHB912 was used and the growth of M.aeruginosa cells,superoxide dismutase（SOD）,peroxidase（POD）,catalase activity and the content of malondiadehyde（MDA） were determined with different Y3＋ concentrations.The results showed that relatively low concentrations of Y3＋（0.05～0.20 mg/L） have obvious auxo-actions to the growth of M.aeruginosa,while the higher concentrations（0.50～10.00 mg/L） of Y3＋ could partly,even completely,inhibit the growth of M.aeruginos.When the concentrations under 0.50～10.00 mg/L,the content of malondiadehyde（MDA） was increased immediately and the enzymatic activity of antioxidant was reduced on the contrary,which lead to the decline of the ability of eliminating the active oxygen and then,the antioxidant defense system was destroyed,the growth of M.aeruginosa was seriously inhibited finally.