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首页> 外文期刊>Environmental toxicology and chemistry >PHYTOCHELATIN INDUCTION, CADMIUM ACCUMULATION, AND ALGAL SENSITIVITY TO FREE CADMIUM ION IN SCENEDESMUS VACUOLATUS
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PHYTOCHELATIN INDUCTION, CADMIUM ACCUMULATION, AND ALGAL SENSITIVITY TO FREE CADMIUM ION IN SCENEDESMUS VACUOLATUS

机译：藻类中卵磷脂的诱导，镉的积累以及对游离镉离子的藻类敏感性

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Phytochelatins are small, intracellular, metal-binding polypeptides produced by algae on exposure to increased metal concentration in their environment. The aim of the present study was to examine the relationship between phytochelatin concentration, bioaccumulated metal, and sensitivity of algal growth on cadmium exposure. For that purpose, intracellular cadmium concentration and thiol (glutathione, γ-glutamylcysteine [γGluCys], and phytochelatins [PC_n]) content were determined in the freshwater green alga Scenedesmus vacuolatus exposed to growth-inhibitory and noninhibitory concentrations of free Cd~(2+) in the range from 10~(-14) to 10~(-7) M. The algal growth rate was optimal up to a free Cd~(2+) concentration of 10~(-9) M and then decreased by 40% at higher concentrations. The intracellular cadmium content increased sharply from 0.22 to 746 amol/cell over this free Cd~(2+) range. At the lowest Cd~(2+) concentration (control), glutathione was the only detectable thiol (127 amol/cell). With increasing Cd~(2+), formation of γGluCys and phytochelatins from PC_2 to PC_6 were observed. The predominant oligomer was PC_3, with 42 amol/cell at the highest Cd~(2+) concentration (10~(-7) M). The ratio of the concentration of total thiol groups to intracellular cadmium was important for maintaining optimal growth. In contrast, thiol groups from phytochelatins were never measured in excess to intracellular cadmium content.
机译：植物螯合素是藻类在环境中暴露于增加的金属浓度时产生的小的细胞内金属结合多肽。本研究的目的是检查植物螯合素浓度，生物积累金属和藻类生长对镉暴露的敏感性之间的关系。为此，测定暴露于抑制性和非抑制性游离Cd〜（2+）浓度的淡水绿藻藻中的细胞内镉浓度和硫醇含量（谷胱甘肽，γ-谷氨酰半胱氨酸[γGluCys]和植物螯合物[PC_n]）的含​​量。 ）在10〜（-14）到10〜（-7）M的范围内。藻类的生长速率最理想，直到游离Cd〜（2+）浓度为10〜（-9）M，然后降低40在较高浓度下为％。在此自由Cd〜（2+）范围内，细胞内镉含量从0.22 mol /细胞急剧增加至746 amol /细胞。在最低的Cd〜（2+）浓度（对照）下，谷胱甘肽是唯一可检测到的硫醇（127 amol /细胞）。随着Cd〜（2+）的增加，从PC_2到PC_6形成γGluCys和植物螯合素。主要的低聚物是PC_3，最高Cd〜（2+）（10〜（-7）M）浓度为42 amol / cell。总硫醇基团与细胞内镉的浓度之比对于维持最佳生长很重要。相反，从未测定来自植物螯合素的硫醇基团超过细胞内镉含量。

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