Relationship between Changes of Physiological-biochemical Characteristic of Grape Roots under Drought-stress and Drought-resistant

The physiological and biochemical changes of grape roots were studied using grape cultivars with different drought resistance in pots under drought stress.The results showed that physiological and biochemical indexes of grape root system had a close correlation with drought resistance.The relative conductivity of grape root increased with drought stress,and the membrane structure of drought resistance varieties were less damaged,so the relative conductivity changed slightly.The proline content of different grape varieties rose with drought stress.The change of proline content in drought resistance varieties was significantly greater than that in drought sensitive varieties.MDA content of grape root system increased under drought stress,the changes were greater in drought resistant varieties than those in drought sensitive varieties.The changes of peroxidase activity first increased and decreased after.The drought resistance grape varieties maintained a high level of peroxidase activity.