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Phytochelatin synthesis in Dunaliella salina induced by arsenite and arsenate under various phosphate regimes

文献类型： 外文期刊

作者： Wang, Ya 1 ; Zhang, Chunhua 3 ; Zheng, Yanheng 1 ; Ge, Ying 1 ;

作者机构： 1.Nanjing Agr Univ, Jiangsu Prov Key Lab Marine Biol, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food Qual & Safety, Nanjing 210014, Jiangsu, Peoples R China

3.Nanjing Agr Univ, Coll Life Sci, Lab Ctr Life Sci, Demonstrat Lab Element & Life Sci Res, Nanjing 210095, Jiangsu, Peoples R China

关键词： Dunaliella salina;Thiol compounds;Arsenate;Arsenite;Phosphate

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

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收录情况： SCI

摘要： This study investigated the dynamic variations in thiol compounds, including cysteine (Cys), glutathione (GSH), and phytochelatins (PCs), in Dunaliella salina samples exposed to arsenite [As(III)] and arsenate [As(V)] under various phosphate (PO43-) regimes. Our results showed that GSH was the major non-protein sulthydryl compound in D. saline cells. As(III) and As(V) induced PC syntheses in D. salina. PC2, PC3, and PC4 were all found in algal cells; the PC concentrations decreased gradually while exposed to As for 3 d. The synthesis of PC2-3 was significantly affected by As(III) and As(V) concentrations in the cultures. More PCs were detected in the As(V)-treated algal cells compared with the As(III) treatment. PC levels increased with As(III)/As(V) amount in the medium, but remained stable after 112 mu g L-1 As(V) exposure. In contrast, significant (p < 0.001) positive correlations were observed between PC synthesis and intracellular As(III) content or As accumulation in As(III)-treated algal cells during the 72-h exposure. PO43- had a significant influence on the PC synthesis in algal cells, irrespective of the As-treated species. Reductions in As uptake and subsequent PC synthesis by D. salina were observed as the PO43- concentration in the growth medium increased. L-Buthionine sulfoximine (BSO) differentially influenced PC synthesis in As-treated D. salina under different extracellular PO43- regimes. Overall, our data demonstrated that the production of GSH and PCs was affected by PO43- and that these thiols played an important role in As detoxification by D. salina.

  • 相关文献

[1]Bioaccumulation kinetics of arsenite and arsenate in Dunaliella salina under different phosphate regimes. Wang, Ya,Zheng, Yanheng,Ge, Ying,Wang, Ya,Zhang, Chunhua.

[2]A symbiotic bacterium differentially influences arsenate absorption and transformation in Dunaliella sauna under different phosphate regimes. Wang, Ya,Ge, Ying,Zhang, Chun Hua,Lin, Man Man.

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[5]Evidence for down-regulation of ethanolic fermentation and K+ effluxes in the coleoptile of rice seedlings during prolonged anoxia. Colmer, TD,Huang, SB,Greenway, H. 2001

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