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Physiological responses of Hizikia fusiformis to copper and cadmium exposure

文献类型： 外文期刊

作者： Zhu, Xifeng 2 ; Zou, Dinghui 1 ; Du, Hong 4 ;

作者机构： 1.S China Univ Technol, Coll Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China

2.Guangdong Acad Agr Sci, Fisheries Lab, Inst Anim Sci, Guangzhou 510640, Guangdong, Peoples R China

3.Minist Educ, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Guanghzou 510006, Peoples R China

4.Shantou Univ, Dept Biol, Shantou 515063, Guangdong, Peoples R China

关键词： catalase: 9001-05-2;EC 1.11.1.6;malondialdehyde: 542-78-9;nitrate reductase: 37256-45-4;EC 1.7.99.4;cadmium: 7440-43-9;toxin;chlorophyll a: 479-61-8;superoxide dismutase: 9054-89-1;EC 1.15.1.1;copper: 7440-50-8;toxin;carotenoid;photosynthetic rate;enzyme activity;species physiological response

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 brown macroalga Hizikia fusiformis was cultured in media with different copper (Cu) or cadmium (Cd) concentrations for 7 days; physiological indicators were measured to establish the toxic effects of Cu and Cd on this economically important seaweed. Relative growth rate of H. fusiformis was significantly reduced at Cu concentrations of >= 0.05 mg l(-1) or Cd >= 4 mg l(-1). Chlorophyll a and carotenoid contents increased at low Cu or Cd concentrations, but significantly decreased at 0.25 and 0.50 mg l(-1) Cu. Optimal quantum yield, maximum net photosynthetic rate and apparent photosynthetic efficiency were reduced with increasing Cu or Cd concentrations. Malondialdehyde content and the superoxide dismutase activity increased under Cu or Cd stress. Catalase activity also increased at low Cu or Cd concentrations, but significantly decreased at high concentrations. Nitrate reductase activity significantly increased at 0.05 mg l(-1) Cu and 4 mg l(-1) Cd, but was inhibited at high Cu or Cd concentrations. Thus, both Cu and Cd were physiological stressors for H. fusiformis, with Cu being more toxic than Cd.

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