Abstract:

The seedlings growth and physiological characteristics of two rice cultivars with different resistance (Xiushui 63 and Xiushui09) were studied with a hydroponic experiment under different Cd concentration (0, 1, 5, 10, 25, 50, 100μmol/L). The results showed that rice seedlings growth restrained significantly with the increasing of Cd concentration and the decrease of height, chlorophyll content and leaf dry weight in Xiushui 63 was greater that those in Xiushui 09. The content of praline and activities of superoxide dismutase (SOD) and peroxidase (POD) were increased under Cd stress. The increase of proline content and POD was more pronounced in the xiushui 63 under lower level of Cd, however, it was more pronounced in the Xiushui 09 under higher level of Cd. The activity of Catalase (CAT) firstly increased and then decreased as the Cd concentration increased. The content of malondialdehyde (MDA) increased with Cd concentration increased, which was higher in Xiushui 63 than Xiushui 09 in the identical concentration of Cd. The experimental results show that Xiushui 09 was more resistant to Cd stress than Xiushui 63.