不同盐碱草地羊草叶片渗透调节物质含量和抗氧化酶活性的比较  

Comparison of Osmoregulatory Substance Contents and Antioxidase Activity in Leaves of Leymus chinensisin Different Salinized Grassland

作　　者：崔喜艳[1,2] 刘忠野[1] 胡勇军[2] 郭继勋[2,1] 

机构地区：[1]吉林农业大学生命科学学院,吉林长春130118 [2]东北师范大学草地研究所/植被生态科学教育部重点实验室,吉林长春130024

出　　处：《中国草地学报》2012年第5期40-46,共7页Chinese Journal of Grassland

基　　金：国家自然科学基金项目(30570273);吉林省教育厅项目(吉教科合字〔2009〕第61号);吉林省自然科学基金项目(201215178)

摘　　要：对松嫩平原不同盐碱化草地的羊草种群叶片游离脯氨酸、甜菜碱含量、超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性、过氧化物酶(POD)活性的季节变化进行测定。结果表明:土壤电导率是影响叶片内甜菜碱含量、CAT活性变化的主要因子;土壤pH是影响叶片内脯氨酸含量和SOD、POD活性变化的主要因子。在同一取样时期,随着样地盐碱化程度增加,叶片内渗透调节物质含量和抗氧化酶活性均与各自主要因子呈正相关。小分子渗透调节物质的大量积累及抗氧化酶系统的调节,是羊草种群对盐碱化适应的重要生理响应。The content of free proline and betaine and activities of superoxide dismutase（SOD）,hydrogen peroxidase（CAT）,peroxidase（POD） in leaves of Leymus chinensis in different salinized grasslands of Songnen Plain were determined from returning green phase to withering phase.The results showed that soil electrical conductivity was the major factor affecting betaine content,activities changes of CAT,pH of soil was the major factor affecting proline content and activities changes of SOD and POD.Content of the osmoregulatory substances and activities of the antioxidase was positively correlated to respective major factors with increasing of salinized degree on same sampling date.Large accumulation of small weigh molecular and adjustment of protective enzymes system were possibly important physiological reactions that Leymus chinensis population was adaptive to different salinized grasslands.

关 键 词：盐碱化草地 羊草 渗透调节物质 抗氧化酶 

分 类 号：Q945.78[生物学—植物学]