镉胁迫对旱柳细胞膜透性和抗氧化酶活性的影响

被引:30
作者
杨卫东
陈益泰
机构
[1] 中国林业科学研究院亚热带林业研究所
关键词
旱柳; 镉; 膜脂过氧化; 抗氧化酶;
D O I
暂无
中图分类号
Q945 [植物生理学];
学科分类号
0903 ;
摘要
以‘Fuyang 3’旱柳为材料,通过水培方法研究了中、高剂量(5、25μmol.L-1)镉胁迫下旱柳器官的镉(Cd2+)积累、叶和根细胞膜渗透及抗氧化酶活性的变化。结果表明:Cd2+主要积累在旱柳的根部(最高达1 297.71μg.g-1),其次是枝条(最高为163.13μg.g-1)。中、高剂量Cd2+胁迫下,旱柳叶相对电导率、根K+渗透以及根和叶丙二醛(MDA)含量均未发生显著变化。中、高剂量Cd2+胁迫使旱柳根系的超氧歧化酶(SOD)、抗坏血酸过氧化物酶(APX)和谷胱甘肽转移酶(GST)活性,以及叶片的SOD、愈创木酚过氧化酶(POD)、谷胱甘肽过氧化物酶(GPX)和GST活性均比对照显著增强;且高剂量胁迫旱柳根系的SOD和GST活性,及其叶片的POD、GPX和GST活性均显著高于相应中剂量胁迫。研究发现,旱柳在不同浓度镉胁迫条件下,其根是Cd2+主要积累器官,其叶和根细胞质膜能保持相对稳定性,其根和叶各抗氧化酶活性发生不同程度改变,从而使旱柳对Cd2+胁迫表现出一定的忍耐性。
引用
收藏
页码:2263 / 2269
页数:7
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