SO_2胁迫对茶条槭叶片6种保护酶活性的影响

目的]研究不同SO2胁迫处理对茶条槭叶片6种保护酶活性的影响。方法]利用SO2静态熏气系统对3年生茶条槭苗木进行胁迫处理,研究不同SO2浓度（0～6.0 mg/m3）和熏气时间（0～6 h）下茶条槭叶片6种保护酶活性的变化趋势。结果]随着SO2浓度的增加,PPO和APX活性一直降低,SOD、CAT、POD和GR活性表现为先迅速上升后下降的趋势,其中GR活性下降较平缓;在不同时间SO2处理中,CAT和GR活性随着胁迫时间的延长先迅速上升而后下降,而SOD、POD、PPO和APX活性均随着胁迫时间的延长而降低,其中SOD和GR活性变化幅度较平缓。结论]PPO、POD和APX活性下降可能是茶条槭幼苗SO2伤害的原因之一,而SOD、CAT和GR活性变化平缓是茶条槭幼苗响应SO2胁迫的适应性机制。

Effect of SO2 Stress on Six Kinds of Protective Enzyme Activity of Acer ginnala Leaves

Objective] The aim was to research the effect of different SO2 stress treatments on six kinds of protective enzyme activities in the leaves of Acer ginnala.Method] In this experiment,the three-year-old seedlings of Acer ginnala were treated by static SO2 fumigation treatment,and the variation tendency of the six protective enzymes activities under different SO2 concentrations(0,0.3,1.5,3.0,6.0 mg/m3)and different treatment times(0,2,4,6 h)were studied.Result] With the increase of SO2 concentrations,PPO and APX activity kept decreasing,SOD,CAT,POD and GR activities firstly increased and then decreased rapidly,while GR activity saw a slight decrease;under different treatment time,CAT and GR activity firstly increased and then decreased with the stress time,but the SOD,POD,PPO and APX activities declined with the prolonging of stress time,and SOD and GR activity saw a much stable fluctuation.Conclusion] The decline of the PPO,POD and APX activities might be one of the causes of the SO2 damage to the Acer ginnala seedlings,and the stable change of SOD,CAT and GR activities was the adaptive response mechanism of Acer ginnala to SO2 stress.