慈姑(Sagittaria sagittifolia L．)对环境镉胁迫因子的应答  

The Responses of Sagittaria sagittifolia L. to Environmental Cadmium Stress

作　　者：胡金朝[1] 刘茵[1] 施国新[2] 梁峰[1] 

机构地区：[1]商丘师范学院生命科学系,河南商丘476000 [2]南京师范大学生命科学学院,南京210097

出　　处：《武汉植物学研究》2009年第2期176-183,共8页Journal of Wuhan Botanical Research

基　　金：教育部高等学校博士学科点专项科研基金(20050319005);河南省教育厅自然科学基金(2008A180021,200510483005)联合资助

摘　　要：主要研究了水环境中Cd2+污染对慈姑(Sagittaria sagittifolia L.)根的毒害影响。结果表明:在Cd2+胁迫下,慈姑根出现不同程度的褐变、发黑,生长受到限制;叶和根尖细胞超微结构受损,叶绿体膨大、类囊体排列紊乱、线粒体嵴减少、空泡化、染色质凝集等;根尖细胞在扫描电镜下呈细胞壁增厚、细胞形状扭曲和排列不规则现象。能谱分析结果表明随外界Cd2+浓度增大,单个慈姑根尖中的Cd2+含量升高,其他营养元素的吸收受到不同程度的影响。Cd2+对慈姑的毒害有明显的剂量效应和时间效应。The toxic effects of environmental Cd^2＋ pollution on Sagittaria sagittifolia L. were mainly studied. It＇s found that Cd^2＋ toxicity induced the roots different degree of browning, blackening and growth restriction. The uhrastructural damages of the leaf and root cells were mainly expressed in chloroplast swelled, thylakoids disordered, mitochondrial cristae decreased, mitochondria swelled and vacuoled as well as chromatin potymerized. The cell wall incrassated, cell shape twisted and cell arrange disordered in the scanning electron microscope. The energy spectrum analysis showed that with the environmental Cd^2＋ concentration increasing, the Cd^2＋ contents in a single root tip increased, and the absorption of other nutrients was affected to varying degrees. Cadmium toxicity on S. sagittifolia L. had clear dose-response and time effects.

关 键 词：CD^2+ 慈姑 超微结构 能谱分析 

分 类 号：X171.5[环境科学与工程—环境科学]