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Effects of arsenate on the growth and microcystin production of Microcystis aeruginosa isolated from Taiwan as influenced by extracellular phosphate

文献类型： 外文期刊

作者： Gong, Yan 1 ; Chou, Hong-Nong 4 ; Tu, Chi-dao 5 ; Liu, Xi 1 ; Liu, Jiantong 1 ; Song, Lirong 1 ;

作者机构： 1.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Peoples R China

2.Hubei Acad Agr Sci, Agr Testing & Informat Ctr, Wuhan 430064, Peoples R China

3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

4.Natl Taiwan Univ, Inst Fisheries Sci, Taipei 10617, Taiwan

5.Natl Cent Univ, Dept Chem, Tao Yuan 32001, Taiwan

关键词： Cyanobacterium;Microcystis aeruginosa;microcystins

期刊名称：JOURNAL OF APPLIED PHYCOLOGY （ 影响因子：3.215； 五年影响因子：3.612 ）

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收录情况： SCI

摘要： Arsenic pollution and eutrophication are both prominent issues in the aquaculture ponds of Taiwan. It is important to study the effects of arsenic on algal growth and toxin production in order to assess the ecological risk of arsenic pollution, or at least to understand naturally occurring ponds. The sensitivity of algae to arsenate has often been linked to the structural similarities between arsenate and phosphate. Thus, in this study we examined the effects of arsenate (10i to 10t M) on Microcystis aeruginosa TY-1 isolated from Taiwan, under two phosphate regimes. The present study showed that M. aeruginosa TY-1 was arsenate tolerant up to 10t M, and that this tolerance was not affected by extracellular phosphate. However, it seems that extracellular phosphate contributed to microcystin production and leakage by M. aeruginosa in response to arsenate. Under normal phosphate conditions, total toxin yields after arsenate treatment followed a typical inverted U-shape hormesis, with a peak value of 2.25 pl 0.06 mg Lp# in the presence of 10" M arsenate, whereas 10i to 10e M arsenate increased leakage of ~75% microcystin. Under phosphate starvation, total toxin yields were not affected by arsenate, while 10e and 10e M arsenate stimulated microcystin leakage. It is suggested that arsenate may play a role in the process of microcystin biosynthesis and excretion. Given the arsenic concentrations in aquaculture ponds in Taiwan, arsenate favors survival of toxic M. aeruginosa in such ponds, and arsenate-stimulated microcystin production and leakage may have an impact on the food chain.

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[1]ARSENIC SPECIATION AND EFFECT OF ARSENATE INHIBITION IN A MICROCYSTIS AERUGINOSA CULTURE MEDIUM UNDER DIFFERENT PHOSPHATE REGIMES. Wang, Chang,Liu, Xi,Liu, Jiantong,Guo, Pengran,Wang, Chang,Gong, Yan. 2011

[2]Effects of inorganic arsenic on growth and microcystin production of a Microcystis strain isolated from an algal bloom in Dianchi Lake, China. Ao HongYi,Song LiRong,Liu JianTong,Gong Yan,Hu DingJing,Zhang XingZhong,Liu BiBo,Wen Sheng,Wang Zhi. 2011

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