The objective of this research is to demonstrate the antioxidant ecological response of Vallisneria asiatica to the heavy metal Cu2+ pollution which is recently a serious problem in the lakes. Batch experiments with five different concentrations of Cu2+ (0, 5, 10, 20, 40, 80 mg·L-1) were carried out. After the 12th day, the roots and leaves of Vallisneria asiatica dipped in the solution with Cu2+ were removed and the physiological and biochemical indexes, chlorophyll, protein and malondialdehyde (MDA) content, superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activity were measured. After the experiment; the roots and leaves cultivated in the 0 mg·L-1 of Cu2+ group showed chlorophyll and protein content reduced while the MDA content, POD and SOD activity were increased notoriously. Compared with the 0 mg·L -1 of Cu2+ group, the 5 mg·L-1 of Cu2+ group showed chlorophyll and protein content increase, SOD and POD activity showed also a slight increase, while MDA content decreased. However, for the 10 mg·L-1 of Cu2+ group, the decrease of chlorophyll and protein content and the increase of MDA content were observed. Also a sharp increase of SOD and CAT activity compared with the 5 mg·L-1 group were found; for over 10 mg·L-1 of Cu2+ concentration, chlorophyll content and protein content fell off, whereas increase of MDA became considerable, CAT raised up steadily and POD showed a decrease trend. The results showed that, both insufficiency and overabundance of Cu2+ in water environment can affect the anti-oxidation function of Vallisneria asiatica, which can be observed by the value of SOD, CAT and POD activity. Therefore, the measurement of anti-oxidation activity, protein content and MDA as a forecast and judgment indicator of Cu2+ contaminations in the water environment can be considered in the future.
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering