Effects of Se on growth and some physiological characteristics of rice seedling under Cd stress
CHEN Ping, YU Tu yuan, CHEN Hui yang, ZHOU Hou gao ( Zhongkai Agrotechnical College , Guangzhou 510225, China )
The nutrient solution culture experiment was conducted to study physiological effects of Se on the plant height,chlorophyll, dry weight and reducing sugar content of leaves, malon dialdehyde concentration and activities of superoxide dismutase(SOD), catalase(CAT)and guaiacol peroxidase(POD)in rice( Oryza sativa L.)seedling under Cd stress. The results indicated that plants under Cd stress without Se supply showed wilt, chlorosis, necrosis in leaves and black in roots, decreased in biomass, SOD and CAT activities of leaves and increease in seedling height, malondialdehyde concentration and POD activities in leaves. The addition of Se to solution with Cd could increase the dry matter weight of leaves, retard the inhibition of Cd to the increase of seedling height and alleviate the Cd toxicity, increase chlorophyll and reducing sugar content(except Cd 0 5 mg/L plus Se 0 10～0 50 mg/L), decrease MDA concentration and POD activities, enhance SOD and POD activities in leaves.