Study On The Resistance Of Toxic Effects Of Cu～(2+) On Aquatic Plants By Cerium(Ce～(3+)) And Neodymium(Nd～(3+)) As Well As Their Alternate Action

The resistance of toxic effects of Ce³⁺ and Nd³⁺ and their alternate action on aquatic plants Potamogeton crispus, Elodea Canadensis L. and Alternanthera philoxeroides (Mart.) Griseb. produces by heavy metals Cu²⁺ were measured by optics photography, physiological and biochemical indexes, concentration of elements and observations of election microscopy. We analyze the appearance, the physiological and biochemical characters, second-cellular structure of Potamogeton crispus, Elodea Canadensis L. and Alternanthera philoxeroides (Mart.) Griseb. macroscopically and microscopically. The results showed that heavy metal Cu²⁺ obviously damaged the content of chlorophyll, protein and H₂O₂, the activity of protective enzymes (SOD, POD, CAT), the O₂^- generating rate, the content of MDA and the cell ultrastructural of Potamogeton crispus, Elodea Canadensis L. and Alternanthera philoxeroides (Mart.) Griseb.. The rare earth in an appropriate concentrations of Ce³⁺ and Nd³⁺ can rise up the activity of protective enzymes (SOD, POD, CAT), the content of chlorophyll , protein and H₂O₂, and bring down the content of MDA, the O₂^- generating rate, protect the cell ultrastructural, lighten the toxic effects of Cu²⁺ on Potamogeton crispus, Elodea Canadensis L. and Alternanthera philoxeroides (Mart.) Griseb.. This thesis discussed the best concentrations of Ce³⁺ and Nd³⁺ that had the most obvious resistance of toxic effects, and researched the principle of the resistance of toxic effects Cu²⁺ on Potamogeton crispus, Elodea Canadensis L. and Alternanthera philoxeroides (Mart.) Griseb. by Cerium(Ce³⁺) and Neodymium(Nd³⁺) as well as their alternate action.