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    Accumulation of cadmium and its effects on physiological characteristics in Coix lacryma-jobi
     

    论文题目

    Accumulation of cadmium and its effects on physiological characteristics in Coix lacryma-jobi

    作    者

    Gaozhong Pu, Denan Zhang, Danjuan Zeng, Guangping Xu and Yuqing Huang*

    发表期刊

    Bangladesh Journal of Botany

    //

    201746(3)

    摘   要

    A wetland simulated experiment was employed to investigate the accumulation of cadmium (Cd) in Coix lacryma-jobi L. and the effects of Cd addition on the growth, photosynthesis characteristics and antioxidant enzymes activities of C. lacryma-jobi L. Results showed that lower concentrations of Cd (0.05 mg/l) increased the stem biomass but higher concentrations of Cd (0.125 and 2.5 mg/l) decreased that. The order of Cd accumulation is stems < leaves < roots. The accumulation of Cd in the above-ground parts were much higher than that of the below-ground parts under moderate concentrations of Cd (from 0.05 to 0.125 mg/l). Meanwhile, the moderate concentration of Cd not only increased the translocation factor of Cd and the effective photochemical efficiency of photosystem II in C. lacryma-jobi but stimulated the activity of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), despite a decrease was found in these characteristics at high Cd stress (2.5 mg/l). These results suggested that the oxidative stress may involve in the mechanism of Cd toxicity and that the tolerance of C. lacryma-jobi to Cd since the activities of SOD, POD and CAT were stimulated by moderate concentrations of Cd.

     

     


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