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二氧化硫对小麦的氧化胁迫及其某些信号分子的调节
引用本文:郝林,张惠文,徐昕,陶思源,于龙.二氧化硫对小麦的氧化胁迫及其某些信号分子的调节[J].应用生态学报,2005,16(6):1038-1042.
作者姓名:郝林  张惠文  徐昕  陶思源  于龙
作者单位:1. 沈阳师范大学生物系,沈阳,110034
2. 中国科学院沈阳应用生态研究所,沈阳,110016
基金项目:国家自然科学基金项目(30070129),辽宁省博士启动基金项目(023804111),沈阳师范大学实验中心主任基金资助项目(SY200406).
摘    要:通过在密闭的培养箱中一次性通入不同体积浓度的SO2气体,研究了小麦幼苗超氧自由基O2-含量和3种抗氧化酶活性的变化,探讨了信号分子水杨酸、乙烯和过氧化氢对SO2氧化胁迫的调节作用.结果表明,当通入10和40 μl·L-1 SO2时,小麦叶片中O2-含量递增,过氧化物酶(POD)和过氧化氢酶(CAT)活性增强,但超氧化物歧化酶(SOD)活性降低.当SO2浓度达到50 μl·L-1时,POD和CAT活性也开始降低,此时叶片尖端出现坏死,叶片绿色部位滋生大量真菌.用1 mmol·L-1水杨酸(SA)(pH6.5)浸泡小麦干种子6 h,或用10 mmol·L-1 H2O2浸泡幼苗,O2-含量低于对照植株,而3种酶的活性高于对照植株,均可有效地减轻SO2的氧化胁迫.在SO2熏蒸下,乙烯显著抑制3种酶的活力,提高O2-的形成速率.SA与乙烯同时使用时,SA几乎完全消除了乙烯的负面作用.

关 键 词:二氧化硫  小麦  水杨酸  乙烯  过氧化氢
文章编号:1001-9332(2005)06-01038-05
收稿时间:2004-10-12
修稿时间:2004年10月12

SO2-caused oxidative stress and modulation of some signal molecules in wheat
Hao Lin,ZHANG Huiwen,XU Xin,TAO Siyuan,YU Long.SO2-caused oxidative stress and modulation of some signal molecules in wheat[J].Chinese Journal of Applied Ecology,2005,16(6):1038-1042.
Authors:Hao Lin  ZHANG Huiwen  XU Xin  TAO Siyuan  YU Long
Institution:Department of Biology, Shenyang Normal University, China. haolinwj2001@yahoo.com.cn
Abstract:By adding different concentration SO2 to culture boxes, this paper studied the responses of wheat seedling's superoxide anion radical O2*- and antioxidant enzymes to SO2. The results showed that when the concentration of SO2 was 10 and 40 microl x L(-1), the O2*- content and peroxidase (POD) and catalase(CAT) activities of wheat leaf were increased, while the activity of superoxide dismutase(SOD) was reduced. When the SO2 concentration was 50 microl x L(-1), the activities of POD and CAT were decreased, with the top end leaves appeared necrosis, and more fungi multiplied on green leaves. Presoaking wheat seeds with 1 mmol x L(-1) salicylic acid (SA) for 6 h or with 10 mmol x L(-1) H2O2 for 12 h could efficiently alleviate the oxidative stress caused by SO2, with the O2*- content decreased and the activities of test antioxidant enzymes increased. Under SO2 fumigation, ethylene significantly inhibited the activities of test enzymes, and promoted the O2*- production rate. When applying SA and ethylene at the same time, SA could almost completely eliminate the influences of ethylene on O2*- production and test enzyme activities.
Keywords:SO_2  Wheat  Salicylic acid  Ethylene  Hydrogen peroxide  
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