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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Accumulation, localisation, and toxic effects of cadmium in the liverwort Lunularia cruciata
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Accumulation, localisation, and toxic effects of cadmium in the liverwort Lunularia cruciata

机译：镉在艾蒿中的积累，定位和毒性作用

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摘要

Accumulation, tissue and intracellular localisation, and toxic effects of cadmium were investigated in the liverwort Lunularia cruciata. The results of analyses carried out by atomic absorption spectrometry on single plants showed that the cadmium accumulation was dose- and time-dependent. Cadmium localisation was assessed by X-ray scanning electron microscopy microanalysis in gemmalings and in the different tissues of the thallus and by X-ray transmission electron microscopy microanalysis at the cellular level. The metal preferentially accumulated in the hyaline parenchyma and at the base of the gemma cups. Inside the cell, cadmium accumulated in the vacuoles and the cell wall. Metal accumulation was accompanied by a concomitant increase in sulphur content within the vacuoles of stressed cells. Gel-permeation chromatography showed that most of the cadmium was associated with a low-molecular-mass fraction eluting at a ratio of elution volume to void volume corresponding to that of phytochelatins. The excess of sulphur deposited in the vacuoles may well have been caused by the stress-induced synthesis of phytochelatins. At the ultrastructural level, sublethal concentrations of cadmium caused alterations of the fine structure of the cells, inducing marked alterations of the chloroplast structure. Cadmium also induced a dose-dependent inhibition of apical thallus growth and gemma germination.
机译：研究了地草十字花科植物镉的积累，组织和细胞内定位以及镉的毒性作用。通过原子吸收光谱法对单株植物进行分析的结果表明，镉的积累与剂量和时间有关。通过X射线扫描电子显微镜显微分析对宝石和and的不同组织进行镉定位，并通过细胞水平的X射线透射电子显微镜显微分析进行评估。金属优先聚集在透明薄壁组织和宝石杯的底部。在细胞内部，镉积累在液泡和细胞壁中。金属积累伴随着应激细胞液泡中硫含量的增加。凝胶渗透色谱法表明，大多数镉与低分子质量分数相关，以与植物螯合素相对应的洗脱体积与空隙体积之比洗脱。沉积在液泡中的过量硫很可能是由压力诱导的植物螯合素合成引起的。在超微结构水平上，亚致死浓度的镉引起细胞细微结构的改变，从而引起叶绿体结构的明显改变。镉还可以诱导剂量依赖性抑制顶叶all生长和宝石发芽。

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