2014•Anhui nongye kexueRequires access
Effects of Cd~(2+) Stress on Physiological and Biochemical Characteristics in Rapeseed Growth and Development
Yuan Lixi
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Abstract
[Objective] The research aimed to study the effects of various concentrations of Cd2 +stress on rape seed germination,growth, chlorophyll content,superoxide dismutase( SOD) activity,peroxidase( POD) activity and malondialdehyde( MDA) content and their influence on the physiological and biochemical characteristics. [Method] Three rape varieties,Siyueman,100 Jinpaihuaguan and Japanese huaguan were adopted in the study using the sand culture method. [Result] The influences of Cd2 +stress on germination of rape seeds,height and weight of rape plants,chlorophyll content,SOD activity,POD activity,and MDA content in the leaves were highly significant( P 0. 01). Growth of the rape plants was enhanced under low concentrations of Cd2 +stress,and were restrained under high concentrations of Cd2 +stress. Germination of rape seeds reached the maximum value when Cd2 +concentration was 0. 002 g / L. Height and weight of rape plants and chlorophyll content reached the maximum value when Cd2 +concentration was 0. 002 mg / L,and the differences were highly significant( P 0. 01). Those of 100 Jinpaihuaguan were significantly higher than the other 2 varieties. SOD activity,POD activity and MDA content of the rape plants were enhanced under low concentrations of Cd2 +stress,and were restrained under high concentrations of Cd2 +stress. SOD activity and POD activity of rape plants reached the maximum value when Cd2 +concentration was 0. 01 mg / L. When Cd2 +concentration reached 0. 02 mg / L,further increasing activities of plant protective enzyme system didn't make up enough for the rape plant injury caused by Cd2 +stress. MDA content of rape plants reached the maximum value when Cd2 +concentration was 0. 005 mg / L,implying peroxidation of membrane was reinforced. [Conclusion] The research could provide scientific basis for the governance of farm soil Cd in the coal mine concentration area in China and the safeguard of agricultural products.