关键词: 钇, 铜绿微囊藻, 抗氧化酶, 丙二醛

Abstract: 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.

Key words: yttrium (Y³⁺), Microcystic aeruginosa, antioxidant enzyme, malondiadehyde