关键词: Cd胁迫, 石竹, 生理生化, 响应

Abstract: [Objective] The aim of this study was to investigate the resistances and susceptibility of D. chinensis to soil heavy metal cadmium (Cd).[Method] A pot-experiment was conducted to measure physiological and biochemical indicators of D. chinensis leaf grown in different Cd concentrations (0,0.3,1,3,10,30 and 50mg/kg).[Results] The biomass of root and shoot,plant height,resistance coefficient and content of soluble protein,increased when Ca concentration was below 3mg/kg but the opposite was true when Ca concentration was above 3mg/kg.With the increase of cadmium concentrations and treatment time,free proline,malondialdehyde and relative conductivity increased gradually.The activities of SOD,POD and CAT increased initially and then declined.[Conclusion] Low Cd concentrations had little effects on D. chinensis when Cd concentration>10mg/kg,the toxicity of cadmium was increased with an increase in concentration and time,implying that D. chinensis is relatively adaptable to soil cadmium stress.

Key words: cadmium stress, Dianthus chinensis, physiology and biochemistry, response