Effects of Cd and Zn on the Physiological and Biochemical Characteristics and Accumulation Abilities of Elytrigia elongata

The effects of individual and combined pollution of cadmium(Cd)and zinc(Zn)on the biomass,the antioxidant enzymes(super oxide dismutase,SOD and peroxidase,POD),the malondialdehyde(MDA)and the proline(Pro)of Elytrigia elongata,and its accumulation abilities for Cd and Zn were measured and analyzed using the soil potted culture experiment methods.The results showed that the biomass of E.elongata decreased with the increase of Cd and Zn concentration under the individual and combined pollution of Cd and Zn,and their biomass had significant differences compared with the contro(l P0.05).The contents of SOD,POD,MDA and Pro increased with the increase of Cd and Zn concentration under the individual Cd or Zn pollution.The content of SOD showed the decrease trend,POD and MDA showed the increase trend with the increase of Cd and Zn concentration under the combined Cd and Zn pollution.The content of Pro decreased at the combined pollution of Cd(10 mg.kg-1)and Zn(200 mg.kg-1),while the Pro increased with the increase of Cd and Zn concentration at the other combined pollution treatments.The accumulation contents of Cd and Zn in roots were significantly higher than the ones in shoots.The results of the present study suggestted that E.elongata was able to accumulate and tolerate in a certain amount of Cd and Zn,and the toxic effects of Cd and Zn combined pollution were greater than the ones of individual Cd or Zn pollution at the same levels.In a conclusion,the E.elongata has a promising remedial potential for the light or middle levels of Cd and Zn contamination soil,because it has the well-developed rhizome and huge biomass which has the absorbing and accumulation function for Cd and Zn from the contaminated soil.