Physiological Changes in the Leaves and Roots of Carpentaria acuminata to Drought Stress and Re-watering Process
To evaluate the physiological responses of Carpentaria acuminata to drought stress and re-watering process,the activities of superoxide dismutase (SOD) and the contents of malondialdehyde(MDA),proline,soluble protein,relative electrical conductivity,chlorophyll a,b and chlorophyll (a +b) in the leaves and roots of C.acuminata were determined when the two-year seedlings were subjected to 0 d(control),7 d,14 d,21 d drought stresses,and 3 d,6 d re-watering.The results showed the activities of SOD,the contents of proline,the contents of soluble protein and the contents of MDA in the leaves increased significantly under 7 d drought stress,then decreased,which were contrary to the pattern for the relative conductivity in the leaves.The contents of chlorophyll could reach to the maximum value under 21 d drought stress then dropped steeply after re-watering.The activities of SOD in the roots increased significantly under 21 d drought stress and decreased significantly under re-watering.The contents of proline in the roots increased under 14 d drought stress,then decreased,and improved when re-watering.The contents of soluble protein in the roots increased under 7 d drought stress,then decreased,and improved when re-watering.The contents of MDA in the roots decreased under 7 d drought stress,then significantly increased under 21 d drought stress and decreased under re-watering.The relative conductivity in the roots increased slightly under 7 d drought stress,and then decreased.The activities of SOD and the contents of MDA in the leaves had the same dynamic tendency from 7d drought stress to re-watering.The same change trend was observed in the roots for the activities of SOD and the contents of MDA from 7 d drought stress to re-watering.The activities of SOD and the contents of MDA in the leaves were significantly higher than those in the roots.However,the contents of proline in the leaves were drastically lower than those in the roots.The synergistic and compensation effects for the leaves and roots were beneficial for the enhancement of plant drought resistance.
国家科技期刊平台
NSTL
万方数据
维普
