In order to provide phytoremediation materials with landscape restorative properties for areas contaminated by soil cadmium(Cd),the pot experiment was conducted to study the effects of different mass concentrations of Cd(0,0.3,3,30,60,120,180 mg/kg)on physiological and enrichment characteristics of Cosmos sulphureus plants.The results were as follows.At 15 days of stress,with the increase of cadmium concentration,the soluble protein,chlorophyll a,chlorophyll b and carotenoid contents and SOD activity in leaves of C.sulphureus showed the tendency of firstly increasing and then decreasing,the MDA content de-creased gradually,and the POD activity decreased first and then increased;ETR,qP and Tr reached the highest values at 0.3 mg/kg of cadmium,Pn and Gs reached the highest values at 3 mg/kg of cadmium,NPQ reached the lowest value at 30 mg/kg of cadmium,Fv/Fm reached the highest value at 60 mg/kg of cadmium,and Fo reached the lowest value at 180 mg/kg of cadmium.At 30 days of stress,soluble protein content and SOD activity increased first then decreased,MDA content increased first then decreased and then increased,and POD activity decreased first then increased and then decreased;chlorophyll a,chlorophyll b and carote-noid contents decreased first and then increased;Fv/Fm reached the highest value at 0.3 mg/kg of cadmium,NPQ reached the highest value while Tr,Pn and Gs dropped to the lowest values at 3 mg/kg of cadmium;qP reached the highest level and Fv/Fm reached the lowest level at 30 mg/kg of cadmium;Pn and Gs reached the highest values but Fo and NPQ dropped to the lowest values at 60 mg/kg of cadmium;Ci decreased to the lowest value at 120 mg/kg of cadmium,and Tr and ETR were the highest at 180 mg/kg of cadmium.When Cd concentration was<180 mg/kg,the Cd content in the organs showed stems>roots>leaves,and showed roots>stems>leaves when Cd concentration was≥180 mg/kg.When the cadmium concentration was≥120 mg/kg,the cadmium content in roots,stems and aboveground parts of C.sulphureus exceeded the critical val-ue of cadmium super-enriched plants.In conclusion,C.sulphureus had excellent tolerance to high concentra-tion cadmium stress and strong cadmium enrichment ability,which could be used as a phytoremediation mate-rial with landscape restoration.
维普
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