这研究涉及 di (2-ethylhexyl ) 的效果二种水萍(Spirodela polyrhiza 和 Lemna 未成年者) 上的 phthalate (DEHP ) 。结果显示 DEHP 由改变他们的生理生物化学的特征在 0.4 mg/L 并且到在超过 0.1 mg/L 次要的 Lemna 有水的毒性到 Spirodela polyrhiza。水萍叶绿素和可溶的蛋白质的内容与在暴露的 7 d 以后增加 DEHP 集中减少。DEHP 在过氧化氢酶(猫) 和 superoxide dismutase (草皮) 显示出刺激角色在相对底层的系统。在 0.01 mg/L 和 0.005 mg/L, Spirodela polyrhiza 和 Lemna 未成年者的草皮活动分别地到达他们的山峰价值,当猫活动在 0.05 mg/L 和 0.01 mg/L 到达它的最大的价值时。当 DEHP 层次太高时,保护酶系统将被破坏,植物生长被禁止。malondialdehyde (MDA ) 和 Fourier 变换的分析红外线的光谱学明白 DEHP 能由破坏它的房间膜,和 Spirodela polyrhiza 影响测试水萍,这比 Lemna 对 DEHP 暴露更抵抗次要。
This study is concerned with the effects of di (2-ethylhexyl) phthalate (DEHP) on two kinds of duckweeds (Spirodela polyrhiza and Lemna minor).The results indicate that DEHP has aquatic toxicity to Spirodela polyrhiza at 0.4 mg/L and to Lemna minor at over 0.1 mg/L by changing their physiologic-biochemical characteristics.The contents of duckweed chlorophyll and soluble protein decrease with increasing DEHP concentration after 7 d of exposure.DEHP shows the stimulating role in catalase (CAT) and superoxide dismutase (SOD) systems at relative low levels.At 0.01 mg/L and 0.005 mg/L,SOD activities of Spirodela polyrhiza and Lemna minor reach their peak values respectively,while CAT activity reaches its maximum value at 0.05 mg/L and 0.01 mg/L.When DEHP levels are too high,the protection enzyme system would be destroyed and plant growth is inhibited.The analysis of malondialdehyde (MDA) and Fourier transform infrared spectroscopy manifest that DEHP could affect the tested duckweeds by destroying its cell membranes,and Spirodela polyrhiza is more resistant to DEHP exposure than Lemna minor.