铜胁迫下两种海州香薷的膜脂过氧化水平及抗氧化能力比较

研究了不同浓度铜处理下2种来源海洲香薷(矿区:湖北赤马山铜矿;正常土壤:湖北红安)膜脂过氧化水平和抗氧化能力的情况。结果表明,在相同浓度的铜处理下,非矿区种的丙二醛(MDA)含量明显高于矿区种,显示非矿区种体内膜脂过氧化水平较高,受到较严重的过氧化伤害;非矿区种体内抗坏血酸(AsA)和还原型谷胱甘肽(GSH)含量以及总抗氧化能力(T-AOC)均低于矿区种。矿区海洲香薷更能耐受铜胁迫,已经形成了抗性生态型,且小分子抗氧化物质在抗性水平提高上起重要作用。

MDA accumulation and antioxidation capacity of two Elsholtzia splendens populations under copper stress

Elsholtzia splendens is the most widely distributed copper-tolerant plant along the middle and lower streams of Yangtze River.Two populations of E.splendens,one from Chimashan mining area and the other from a normal soil of Hongan,all in Hubei Province,were chosen to investigate their MDA accumulation and antioxidation capacity.The results showed that E.splendens from normal soil accumulated more MDA than that from mining area,which indicated the serious peroxide harm to the plant.The concentrations of AsA,GSH and T-AOC were much higher in the plant from mining area than that from normal soil,suggesting that E.splendens from mining area had been evolved to copper-tolerant ecotype,and low molecular antioxidant played an important role in tolerance of the plant.