Physiological responses induced by copper bioaccumulation in Eichhornia crassipes (Mart.)

被引:29
作者
Hu, Chaohua
Zhang, Lei
Hamilton, David
Zhou, Wenbing
Yang, Tewu
Zhu, Duanwei [1 ]
机构
[1] Huazhong Agr Univ, Key Lab Subtrop Agr & Environm, Minist Agr, Coll Resource & Environm, Wuhan 430070, Peoples R China
[2] Huazhong Agr Univ, Key State Lab Agr Microbiol, Coll Life Sci & Technol, Wuhan 430070, Peoples R China
[3] Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China
[4] Univ Waikato, Ctr Biodivers & Ecol Res, Hamilton, New Zealand
基金
中国国家自然科学基金;
关键词
Eichhornia crassipes; copper; physiological responses; bioaccumulation;
D O I
10.1007/s10750-006-0404-9
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Eichhornia crassipes (Mart.) has strong ability to remove Cu2+ from copper-contaminated water. Physiological responses in E. crassipes exposed to known concentrations of Cu2+ were examined in this study, and demonstrated that E. crassipes could accumulate 314 mg kg(-1) dry weight of Cu when exposed to 5 mg l(-1) of Cu2+ for periods up to 14 d. However, there were marked changes in physiology of the plant commencing at Cu2+ concentrations of 1 mg l(-1). Results of this study showed that E. crassipes could tolerate moderate concentrations (i.e. 0.5 mg l(-1)) of Cu2+, without significant changes in photosynthetic pigment concentrations, while high concentrations (i.e. 5 and 10 mg l(-1)) of Cu2+ resulted in substantial loss in pigment concentrations. Increases in malondiadehyde (MDA) content were also demonstrated in plant exposure to high Cu2+ concentrations. Soluble protein content increased to a level slightly higher than the control at < 0.5 mg l(-1) of Cu2+, but then decreased with exposure to > 1 mg l(-1) of Cu2+. Our results suggest that E. crassipes has a substantial capacity to accumulate copper when cultivated at moderate concentrations of Cu2+, without marked changes in its physiology. The findings indicate that E. crassipes is a promising possibility for phytoremediation of moderately Cu-contaminated water bodies.
引用
收藏
页码:211 / 218
页数:8
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