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作 者 ：胡金朝;刘茵;施国新;梁峰

期 刊 ：武汉植物学研究 2009年 27卷 2期 页码：176-183

关键词：Cd2+；慈姑；超微结构；能谱分析；

Keywords:Cd2+, SagittariasagittifoliaL., Ultrastructural, Energyspectrumanalysis,

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。

Abstract:The toxic effects of environmental Cd²⁺ pollution on Sagittaria sagittifolia L.were mainly stu-died.It’s found that Cd²⁺ toxicity induced the roots different degree of browning,blackening and growth restriction.The ultrastructural 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 polymerized.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 Cd²⁺ concentration increasing,the Cd²⁺ 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.

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