| Growing energy crops in heavy metals-contaminated soils is a good approach to both environmental and bio-energy issues. In this experiment, a pot experiment was conducted to examine the effects of Cd on the growth of Pennisetumhydridum with adding different concentrations of cadmium of 0 mg·kg-1, 1 mg·kg-1, 5 mg·kg-1 and 10 mg·kg-1. The results showed that the growth of P. hydridum was not significantly influenced by low Cd, but adding 10 mg·kg-1 Cd treatment had a significant inhibitory effects on the plant height and aboveground biomass after six months of growth. There were significant negative linear relationships between soil Cd concentrations and plant growth parameters including plant height, fresh leaf biomass, and stem biomass with coefficients（R2） of 0.438 3, 0.403 1 and 0.618 5 respectively. The maximum photochemical efficiency（Fv/Fm） and activities of antioxidant enzymes（CAT, POD and SOD） were stimulated by Cd at low, but inhibited at high Cd concentrations. Concentrations of adding Cd in the aboveground parts were 0.39, 2.65, 10.83 and 11.77 mg·kg-1 and 0.49, 3.66, 16.04 and 25.82 mg·kg-1 in underground parts for the treatments 0, 1, 5, and 10 mg·kg-1 respectively. Hence, P. hydridum could be used to reclaim Cd contaminated soil. |
