作　　者： ; ; ; ; ; ;

机构地区： 湖南农业大学资源环境学院环境科学系

出　　处： 《农业环境保护》 2001年第5期341-344,共4页

摘　　要： 采用室内培养实验方法,以植物的生长量、过氧化氢酶CAT和过氧化物酶POD活性变化作为观测指标研究了直链烷基苯磺酸钠LAS对稀脉浮萍LemnapaucicostataL.、满江红AzollaimbricataRoxb.Nakai、水网藻Hydrodictyonsp.生理生化特性的影响。结果表明当LAS浓度超过1mg·L-1时稀脉浮萍的生长受到严重抑制在10、100mg·L-1下出现负增长。CAT、POD活性变化与细胞受伤程度直接相关可作为植物分子生态毒理学指标。LAS浓度在0—10mg·L-1范围内随着浓度升高酶活性增加清除细胞中由于LAS产生的过氧化物伤害;当浓度超过10mg·L-1时植物受到明显损伤甚至死亡。同时发现,CAT、POD活性水平与植物的类群直接相关,被子植物稀脉浮萍的酶活性比蕨类植物满江红的高藻类植物水网藻酶活性最低。 Effects of linear alkylbenzene sulfonate (LAS) on physiological and biochemical characteristics of Lemna paucicostata L., Azolla imbricata (Roxb.) Nakai and Hydrodictyon sp. was studied by several test indices: biomass increase, catalase (CAT) activity and peroxides (POD) activity. The results showed that the biomass increase of Lemna paucicostata was seriously inhibited when concentration of LAS exceeded 1 mg·L-1, and it was a negative number at concentrations of 10 and 100 mg·L-1. The changes of activities for CAT and POD directly related to injured degree of plant cells, which may be used as an index for plant molecular ecotoxicology. The activities of CAT and POD increased with the concentrations of LAS in a rang of 0—10 mg·L-1. Peroxides could be cleared away. However, when the concentration of LAS exceeded 10 mg·L-1, the injury on the plants was obvious, even to death. In the meantime, the level of CAT and POD activities of plants responded to the level of their evolution. Both CAT and POD activities of angiospermae Lemna paucicostata L. were much higher than that of pteridophyta Azolla imbricata, in which the enzyme activities of algae Hydrodictyon sp. were the lowest.

关 键 词： 水生植物 表面活性剂 过氧化氢酶 过氧化物酶 生理 生化 特性 生物监测

领　　域： [环境科学与工程] [环境科学与工程]