Physiological responses and accumulation of Bromus inermis to Cd and Zn stress

In order to explore the phytoremediation potential of Bromus inermis to Cd and Zn stress, the physiological response of B.inermis at the different concentrations of Cd and Zn (five concentrations of Cd: 0, 200, 400, 600 and 800 mgkg-1; Zn: 0, 400, 800, 1 200 and 1 600 mgkg-1) and accumulation features were studied by a greenhouse pot experiment. The results showed that the chlorophyll content increased slightly, MDA accumulation was a little, SOD and POD activities were higher under the low concentration stress compared with control. With the increase of Cd and Zn concentration, the chlorophyll content decreased, MDA accumulation increased, SOD and POD activities decreased and plantlets suffered persecution significantly. Moreover, the results also showed that the optimum concentration of accumulation to Cd was 400 mgkg-1; and the Cd accumulations of aboveground and underground of the single plantlet were 183.533 and 661.128 mgkg-1 respectively. It demonstrated that B.inermis is a Cd enrichedtype plant. Meanwhile, the Zn accumulations of aboveground and underground of the single plantlet were 11.839 and 6.844 mgkg-1 respectively; and B.inermis is also a Zn avoidedtype plant.