干旱胁迫下葡萄根系的生理生化变化与抗旱性的关系

以盆栽不同抗旱类型葡萄品种为试材,研究了干旱胁迫下,葡萄根系的生理生化变化。结果表明:葡萄根系的生理生化指标与抗旱性有密切的相关性。葡萄根系的相对电导率值,随着干旱胁迫程度的增加而增大,抗旱性强的品种其膜结构破坏相对要轻,其相对电导率变化小,因此其相对电导率值维持较低的水平;随干旱胁迫加强,不同葡萄品种根系组织中游离脯氨酸含量的变化呈现上升趋势,抗旱的葡萄品种,其游离脯氨酸含量变化明显大于不抗旱品种;干旱胁迫下,葡萄根系丙二醛含量增加,抗旱性弱品种增幅大,抗旱性强的品种增幅小;随着干旱胁迫程度的加强,过氧化物酶活性变化,表现为先上升后下降趋势,抗旱性强的葡萄品种,其根系过氧化物酶活性维持在较高的水平。

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.