【摘要】 测定分析圆柏属2种常绿木本植物叶抗氧化系统在冷冻适应过程中的季节变化。结果表明,叶能在组织结冰状况下生存与其具备完善的抗氧化保护系统有关,该系统能及时清除氧自由基、抑制膜脂过氧化、维持膜的完整性;冷适应期积累的活性氧可能诱导了抗氧化保护系统使叶片获得抗冻性。祁连圆柏的抗氧化系统比圆柏在抗冻性诱导中具有更广泛的适应策略。更多还原

【Abstract】 This paper studied the seasonal changes of leaf anti-oxidative system in evergreen woody plants Sabina przewalskii and S.chinensis during their adaptation process of freezing.The results showed that the freezing tolerance of Sabina was correlated with its leaf anti-oxidative system which could scavenge or detoxify reactive oxygen species(ROS),inhibit membrane lipid peroxidation,and maintain membrane integrality in time.The ROS accumulated in the process of cold acclimation might induce the leaf to acquire freezing tolerance through its anti-oxidative system.The better capability of anti-oxidative system in S.przewalskii might account for its greater freezing tolerance than S.chinensis.更多还原