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Toxicity and removal of heavy metals (cadmium, copper, and zinc) by Lemna gibba

机译：Lemna gibba的毒性和重金属（镉，铜和锌）的去除

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摘要

Effects of cadmium, copper, and zinc on the aquatic plant Lemna gibba were determined under controlled conditions; in parallel their removal from the growth medium was followed. The results showed that the three heavy metals affected growth, a physiological stress index defined as the ratio of Chlorophyll to phaeophytin (D665/D665a), and the contents of proline. After 4 days, 10~(-3)-10~(-1) mg/L Cd inhibited growth by 25-100%, reduced D665/D665a by 35-89%, and increased proline content by 44-567%. Under the same conditions, 10~(-4)-10~(-1) μg/L Cu inhibited growth by 36-75%, reduced D665/ D665a by 19-81%, and increased proline content by 67-288%. Comparable concentrations of Zn had little effect. However, higher concentrations (4, 30, and 50 mg/L) inhibited growth by 50-79%. Also, 0.1 and 30 mg/L induced a small reduction of D665/D665a (-3.8% and -22%) and an increase in proline contents (+144% and +177%). When it was observed, proline accumulation was always transient and the maximum was reached after 4 days. Monitoring metal concentration in the medium showed that L. gibba was able to remove metals from the medium. Zn and Cu removal was biphasic, it was rapid during the first 2 days (> 60% reduction) and slow (10-20%) during the following 8 days. For Cd, removal was linear and depended on the initial concentration. It reached approximately 90% after 6 or 8 days for initial concentrations of 10~(-1) and 10~(-3)mg/L, respectively.
机译：在受控条件下测定了镉，铜和锌对水生植物Lemna gibba的影响。平行地，将它们从生长培养基中除去。结果表明，这三种重金属影响生长，生理压力指数定义为叶绿素与疏藻素的比例（D665 / D665a）和脯氨酸的含量。 4天后，10〜（-3）-10〜（-1）Cd抑制生长25-100％，D665 / D665a降低35-89％，脯氨酸含量增加44-567％。在相同条件下，10〜（-4）-10〜（-1）μg/ L Cu抑制生长36-75％，降低D665 / D665a 19-81％，脯氨酸含量增加67-288％。相同浓度的锌几乎没有影响。但是，较高的浓度（4、30和50 mg / L）抑制了50-79％的生长。同样，0.1和30 mg / L引起D665 / D665a的少量降低（-3.8％和-22％）和脯氨酸含量的增加（+ 144％和+ 177％）。当观察到时，脯氨酸的积累总是短暂的，并且在4天后达到最大值。监测培养基中的金属浓度表明，吉氏乳杆菌能够从培养基中除去金属。锌和铜的去除是双相的，在开始的2天中去除迅速（减少60％以上），在随后的8天中去除缓慢（10-20％）。对于镉，去除是线性的，取决于初始浓度。 6或8天后，初始浓度分别为10〜（-1）和10〜（-3）mg / L达到约90％。

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  • 来源
    《Ecotoxicology and Environmental Safety》 |2009年第6期|1774-1780|共7页
  • 作者

    Smain Megateli; Saida Semsari; Michel Couderchet;

  • 作者单位

    Laboratoire d'amelioration des plantes, departement des Sciences Agronomiques, Universite Saad Dahlab, BP 270, route de Soumaa, Blida 09000, Algerie Laboratoire de genie chimique, departement de genie des procedes, Universite Saad Dahlab, BP 270, route de Soumaa, Blida 09000, Algerie Laboratoire des plantes, pesticides et developpement durable, URWC-SE. Universite de Reims Champagne-Ardenne, BP 1039, 51687 Reims cedex 02, France;

    Laboratoire de genie chimique, departement de genie des procedes, Universite Saad Dahlab, BP 270, route de Soumaa, Blida 09000, Algerie;

    Laboratoire des plantes, pesticides et developpement durable, URWC-SE. Universite de Reims Champagne-Ardenne, BP 1039, 51687 Reims cedex 02, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    heavy metals; toxicity; lemna gibba; phytoremediation;

    机译：重金属;毒性;莱姆纳·吉巴植物修复;

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