Physiological responses of Porphyra haitanensis (Rhodophyta) to copper and cadmium exposure

文献类型: 外文期刊

第一作者: Zhu, Xifeng

作者: Zhu, Xifeng;Huang, Yanhua;Cao, Junming;Sun, Yuping;Chen, Bing;Chen, Xiaoying;Zou, Dinghui;Zou, Dinghui

作者机构:

关键词: cadmium;copper;growth;photosynthesis;Porphyra haitanensis

期刊名称:BOTANICA MARINA ( 影响因子:1.843; 五年影响因子:1.746 )

ISSN:

年卷期:

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收录情况: SCI

摘要: The aim of the present work was to evaluate the effects of copper (Cu) and cadmium (Cd) on the physiology of the red macroalga Porphyra haitanensis Chang and Zheng. The alga was cultured in media with different Cu or Cd concentrations for 7 days. The relative growth rate was significantly reduced at Cu concentrations of 0.10 mg l(-1) and above or at Cd concentrations of 4 mg l(-1) and above. Chlorophyll a (Chl a), carotenoids (Car), phycoerythrin (PE) and phycocyanin (PC) contents decreased at high Cu or Cd concentrations, and PE content increased at 0.10 mg l (-1) Cu or 4-8 mg l (-1) Cd. Moreover, the optimal quantum yield, maximum net photosynthetic rate (P-m) and apparent photosynthetic efficiency (a) were significantly reduced at high Cu or Cd concentrations. In contrast, malondialdehyde (MDA) content and superoxide dismutase (SOD) activity increased in response to Cu or Cd treatment. Catalase activity increased at 2-8 mg l (-1) Cd and significantly declined at 0.50 mg l (-1) Cu or 10 mg l (-1) Cd. Nitrate reductase (NR) activity declined at high Cu or Cd concentrations. Consequently, both Cu and Cd were physiological stressors for P. haitanensis, with Cu being more toxic than Cd. This work has generated valuable knowledge about the toxic effects of Cu and Cd on macroalgae.

分类号: Q17

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