海水胁迫对黑松幼苗抗性的影响

[目的]探讨保护酶系统及丙二醛（MDA）在黑松中的抗盐碱作用。［方法］ 以1年生黑松幼苗为材料，研究了海水盐度及胁迫时间对其根、茎、叶中活性氧和MDA含量以及超氧化物歧化酶（SOD）和过氧化物酶（POD）活性的影响。［结果］ 在低盐度的海水胁迫下，SOD活性呈非线性上升趋势；在高盐度的海水胁迫下，SOD活性呈降低趋势，且海水浓度组的SOD活性最低。第3天，1/2海水浓度组的POD活性达最大值，比对照组高88.23%。第6天，1/2海水浓度组的POD活性比第3天下降95.86%；海水浓度组的POD活性是对照组的309.00%，仅比1/4海水浓度组低29.19%。第9天，1/4海水浓度组的SOD活性达最大值，比对照组高96.27%，比第6天高13.75%；海水浓度组的MDA含量达最大值，比对照组高320.00%，比第3天高130.00%，比第6天高52.30%。［结论］ 黑松幼苗具有良好的抗盐碱能力。

Influence of Seawater Stress on the Resistance of Pinus thunbergii Parl Seedlings

[Objective] The research aimed to discuss the anti-saline-alkaline function of protective enzyme system and MDA in Pinus thunbergii Parl.[Method] With 1 year old P.thunbergii seedlings as materials,the influences of seawater salinity and stress time on the contents of active oxygen and MDA and the activities of superoxide dismutase(SOD) and peroxidase(POD) in their roots,stems and leaves were researched.[Result] Under the stress with low-salinity seawater,the activity of SOD showed non-linear increasing tre...