In order to explore the changes in the growth,photosynthetic characteristics and physiological responses of Viola tricolor L.under Cd stress,this study used a pot experiment to measure the changes in growth,photosyn-thesis and stress-resistance physiological indicators of Viola tricolor L.grown in different Cd concentrations(0,5,10,20,50,100 and 200 mg/kg),which expected to provide a theoretical basis for the Cd tolerance determination of Viola tricolor L.,its application in Cd-contaminated soil and the screening of potential Cd-contaminated remedia-tion plants.The results showed that at low concentrations(5～10 mg/kg),the growth indicators,net photosynthetic rate,and transpiration rate of Viola tricolor L.increased slightly,and the content of soluble protein,soluble sugar,and free proline increased as well as SOD,POD,and CAT activation,showing a certain degree of Cd tolerance;when the Cd concentration is high(≥100 mg/kg),Viola tricolor L.shows obvious toxic effects.Growth and pho-tosynthesis inhibited;SPAD value decreased;MDA content increased significantly;enzymatic protection system activity and osmotic adjustment substance content decreased.The prolongation of the stress time generally plays the role of deepening the stress.
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