Effect of Low Temperature Stress on the Membrane-lipid Peroxidation and the Concentration of Free Proline in Camptotheca acuminata Seedling
- Received Date: 2000-10-08
Abstract: The activity of superoxide dismutase (SOD) and the concentration of chlorophyll, free proline (Pro), and malondialdehyde (MDA) of Camptotheca acuminata seedling under low temperature stress were studied. The results are as follows. The low temperature stress (4 ℃ and 8 ℃)decreased the concentration of chlorophyll. The SOD activity became lower at the beginning of stressing and higher later on. After 7 days' stressing, SOD activity became higher comparing to the former phase. This was quite different from other plant's reaction. With the stressing, the concentration of MDA became higher. At the same time, the concentration of Pro was also higher and higher. The results also show that there was a negative relationship between the SOD activity and the concentration of MDA and Pro. The concentration of MDA and Pro can be used as indexes to show how the seedling can endure the cold.