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首页> 外文期刊>Ecotoxicology >Biochemical and growth performance of the aquatic macrophyte Azolla filiculoides to sub-chronic exposure to cylindrospermopsin
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Biochemical and growth performance of the aquatic macrophyte Azolla filiculoides to sub-chronic exposure to cylindrospermopsin

机译：水生植物Azolla filiculoides的亚慢性暴露于cylindrospermopsin的生化和生长性能

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摘要

Physiological and biochemical effects of cylindrospermopsin (CYN), a cyanobacterial toxin that inhibits protein synthesis and released during a harmful cyanobacterial bloom, has been overlooked in plants. Therefore, at the present research, the toxic effects (physiological and biochemical) of a crude extract containing CYN were assessed in the aquatic fern Azolla filiculoides exposed to three concentrations (0.05, 0.5 and 5 mu g CYN mL(-1)). At 5 mu g CYN mL(-1), fern growth rate has showed a drastic decrease (0.001 g g(-1) day(-1)) corresponding to a 99.8 % inhibition, but at the concentrations of 0.05 and 0.5 mu g CYN mL(-1) the growth rate was similar to the control plants. Growth rate also indicated a IC50 of 2.9 mu g CYN mL(-1). Those data point to the presence of other compounds in the crude extract may stimulate the fern growth and/or the fern is tolerant to CYN. Chlorophyll (a and b), carotenoids and protein content as well as the activities of glutathione reductase (GR) and glutathione-S-transferase (GST) has increased at 5 mu g CYN mL(-1) which may indicate that photosynthesis and protein synthesis are not affected by CYN and the probable activation of defense and detoxifying mechanisms to overcome the effects induced by the presence of CYN. Low uptake of cylindrospermopsin (1.314 mu g CYN g(-1) FW) and low bioconcentration factor (0.401) point towards to a safe use of A. filiculoides as biofertilizer and as food source, but also indicate that the fern is not suitable for CYN phytoremediation.
机译：cylindrospermopsin（CYN）是一种抑制蛋白质合成并在有害蓝藻开花期间释放的蓝藻毒素，其生理生化作用已在植物中被忽略。因此，在目前的研究中，在暴露于三种浓度（0.05、0.5和5μgCYN mL（-1））的水生蕨类植物Azolla filiculoides中评估了含有CYN的粗提物的毒性作用（生理和生化）。在5μg CYN mL（-1）下，蕨类植物的生长速度急剧下降（0.001 gg（-1）day（-1）），对应抑制率为99.8％，但在0.05和0.5μg CYN浓度下mL（-1）的生长速率与对照植物相似。增长率也表明IC50为2.9μg CYN mL（-1）。这些数据表明粗提物中存在其他化合物可能会刺激蕨类植物的生长和/或蕨类植物对CYN具有耐受性。 5μg CYN mL（-1）时叶绿素（a和b），类胡萝卜素和蛋白质含量以及谷胱甘肽还原酶（GR）和谷胱甘肽S-转移酶（GST）的活性增加，这可能表明光合作用和蛋白质合成不受CYN和可能的防御和解毒机制的激活，以克服由CYN的存在所引起的影响。 cylindrosperpsoppsin的摄入量低（1.314μg CYN g（-1）FW）和低的生物浓缩系数（0.401）表示安全地使用了丝藻作为生物肥料和食物来源，但也表明蕨类植物不适合用于CYN植物修复。

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