镉胁迫对金银花生理生态特征的影响

采用水培试验方法,研究了不同浓度镉(Cd)(0、5、10、25和50 mg·L^-1) 胁迫条件下藤本植物金银花的生长和生理特性.结果表明: 与对照相比,Cd胁迫对金银花的生长未造成明显影响，在5～50 mg·L^-1 Cd处理下，其生物量无明显差异(P>0.05)，在低浓度Cd(5 mg·L^-1)处理下生物量有所增加，叶、根生物量和总生物量分别增加了2.88%、2.33%和1.25%，说明金银花对Cd具有较强的抗性.在低浓度Cd胁迫下，植物各器官的含水量和可溶性蛋白含量均有所降低,而根系和叶片的丙二醛含量分别增加51.90%和23.07%，叶绿素和类胡萝卜素含量则增加15.87%和24.89%，超氧化物歧化酶活性也显著增强.随着Cd浓度的增高，金银花体内的叶绿素和类胡萝卜素含量，以及超氧化物歧化酶活性均有所降低.

Effects of cadmium stress on the growth and physiological characteristics of Lonicera japonica.

By using hydroponics, the growth and physiological characteristics of Lonicera japonica at different concentrations (0, 5, 10, 25, and 50 mg·L-1) of cadmium (Cd) were studied. The results showed that compared with the control, Cd stress had lesser effects on the growth of L. japonica. Within the range of test Cd concentrations, L. japonica biomass had less difference (P>00 5) with the control, and at low concentration of Cd (5 mg·L-1), the total biomass and the biomasses of leaf and root were increased by 125%, 288 and 2 33%, respectively, illustrating that L. japonica had stronger resistance a gainst Cd. Under low concentration Cd stress, the water content and soluble prot ein content in plant organs had some decrease, while the malondialdehyde (MDA) c ontent in root and leaf increased by 5190% and 2307%, respectively, leaf chl orophyll and carotenoid contents increased by 1587% and 2489%, respectively, and superoxide dismutase (SOD) activity increased significantly. With increasin g Cd concentration, the chlorophyll and carotenoid contents and SOD activity dec reased to some extent.