芦苇化感物质对藻类细胞膜选择透性的影响  

Effects of Allelochemical Isolated from Phragmites communis on Algal Membrane Permeability

作　　者：李锋民[1] 胡洪营[1] 种云霄[2] 郭美婷[1] 门玉洁[1] 

机构地区：[1]清华大学环境科学与工程系环境模拟与污染控制国家重点联合实验室 [2]华南农业大学资源与环境学院,广州510642

出　　处：《环境科学》2007年第11期2453-2456,共4页Environmental Science

基　　金：国家'十五'科技攻关计划项目(2003BA809B04-02);NSFC-JST重大国际合作项目(20477021)

摘　　要：以藻类渗出的K+、Mg2+、Ca2+浓度为表征,以ICP-MS检测为手段,研究了芦苇抑藻化感物质2-甲基乙酰乙酸乙酯(eathyl-2-methyl acetoacetate,EMA)对铜绿微囊藻、蛋白核小球藻和普通小球藻细胞膜选择透性的影响.结果表明,在实验条件下,铜绿微囊藻和蛋白核小球藻细胞经煮沸完全破坏细胞膜时K+渗出量为1.45、1.59μg.(109cell)-1,当EMA浓度为2 mg.L-1时,铜绿微囊藻和蛋白核小球藻的K+渗出量为1.38、1.40μg.(109cell)-1,当EMA浓度为4 mg.L-1时,铜绿微囊藻和蛋白核小球藻的K+渗出量为1.441、.58μg.(109cell)-1,离子渗出量达到完全破坏细胞膜最大渗出量的95%以上.EMA浓度为4 mg.L-1时,普通小球藻的细胞内K+渗出量为0.64μg.(109cell)-1,仅为完全破坏细胞膜后K+渗出量的31.5%.EMA对Mg2+、Ca2+的渗出量的影响规律与K+相同.EMA破坏了铜绿微囊藻和蛋白核小球藻的细胞膜,但对普通小球藻的细胞膜透性没有显著影响.这是EMA选择性抑藻的机理之一.Efflux of K^＋ , Mg^2＋ , Ca^2＋ ions from algal cells as signals of cell membrane permeability, inductively coupled plasma mass spectrometry （ICP-MS） as detection method of ions, the present research investigated effects of allelochemical eathyl-2-methyl acetoacetate （EMA） isolated from Phragmltes communis on cell membrane permeability of Microcystis aeruginosa, Chlorella pyrenoidosa and Chlorella vulagaris. The results showed that, when the cells were boiled for 10 min and the membrane was destroyed absolutely, the K^＋ efflux of M. aeruginosa and C. pyrenoidosa were 1.45 and 1.59μg·（10^9cell）^-1, respectively. When the concentration of EMA was 2mg·L^-1, the K^＋ efflux of M. aeruginosa and C. pyrenoidosa were 1.38 and 1.40μg·（10^9cell）^-1, respectively. The K^＋ efflux of M. aeruginosa and C. pyrenoidosa reached 1.44 and 1.58 μg·（10^9cell）^-1 while the EMA was 4 mg·L^-1 . When the concentrations were 2 mg·L^-1 or 4 mg·L^-1 the K^＋ efflux reached more than 95% of the total ion amount in M. aeruginosa and C. pyrenoidosa cells. But when EMA concentration was 4 mg·L^-1 , K^＋ efflux of C. vulagaris was 0.64μg·（10^9cell）^-1 , which was only 31.5% of total K^＋ amount in C. vulagaris. Effects EMA on efllux of Mg^2＋ and Ca^2＋ were similar to those of K^＋ . The results indicated that EMA destroyed the cell membrane of M. aeruginosa and C. pyrenoidosa but not C. vulagaris. This is one of the mechanisms of EMA species-selective antialgal.

关 键 词：2-甲基乙酰乙酸乙酯 化感物质 藻类细胞膜选择透性 芦苇 水华控制 

分 类 号：X52[环境科学与工程—环境工程]