Physiological responses of fenugreek seedlings and plants treated with cadmium

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• 作者：Chaabene Zayneb ; Khemakhem Bassem…
• 关键词：Amylase ; Germination ; Growth ; Flavonoids ; Oxidative stress ; Phenols
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：22
• 期：14
• 页码：10679-10689
• 全文大小：1,085 KB
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• 作者单位：Chaabene Zayneb (1)
  Khemakhem Bassem (1)
  Kamoun Zeineb (2)
  C. Douglas Grubb (3)
  Drira Noureddine (1)
  Mejdoub Hafedh (1)
  Elleuch Amine (1)
  
  1. Laboratory of Plant Biotechnology, Faculty of Sciences, University of Sfax, BP 1171, 3000, Sfax, Tunisia
  2. Animal Physiology Laboratory, Life Sciences Dept., Faculty of Sciences, University of Sfax, BP 1171, 3000, Sfax, Tunisia
  3. Department of Molecular Signal Processing, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120, Halle (Saale), Germany
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

The bioaccumulation efficiency of cadmium (Cd) by fenugreek (Trigonella foenum-graecum) was examined using different concentrations of CdCl2. The germination rate was similar to control except at 10?mM Cd. However, early seedling growth was quite sensitive to the metal from the lowest Cd level. Accordingly, amylase activity was reduced substantially on treatment of seeds with 0.5, 1, and 10?mM Cd. Cadmium also affected various other plant growth parameters. Its accumulation was markedly lower in shoots as compared to roots, reducing root biomass by almost 50?%. Plants treated with 1 and 5?mM Cd presented chlorosis due to a significant reduction in chlorophyll b especially. Furthermore, at Cd concentrations greater than 0.1?mM, plants showed several signs of oxidative stress; an enhancement in root hydrogen peroxide (H2O2) level and in shoot malondialdehyde (MDA) content was observed. Conversely, antioxidant enzyme activities (superoxide dismutase (SOD), ascorbate peroxidase (APX), and catalase (CAT)) increased in various plant parts. Likewise, total phenolic and flavonoid contents reached their highest values in the 0.5?mM Cd treatment, consistent with their roles in quenching low concentrations of reactive oxygen species (ROS). Consequently, maintaining oxidant and antioxidant balance may permit fenugreek to hyperaccumulate Cd and allow it to be employed in extremely Cd polluted soils for detoxification purposes.