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A symbiotic bacterium differentially influences arsenate absorption and transformation in Dunaliella sauna under different phosphate regimes

文献类型： 外文期刊

作者： Wang, Ya 1 ; Zhang, Chun Hua 2 ; Lin, Man Man 3 ; 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.Nanjing Agr Univ, Demonstrat Lab Element & Life Sci Res, Lab Ctr Life Sci, Coll Life Sci, Nanjing 210095, Jiangsu, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Food Safety & Monitoring Technol, Nanjing 210014, Jiangsu, Peoples R China

关键词： Dunaliella saline;Symbiotic bacteria;Arsenate;Phosphate;Metabolism

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

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收录情况： SCI

摘要： In this study, we investigated the effects of a symbiotic bacterium and phosphate (PO43-) nutrition on the toxicity and metabolism of arsenate (As(V)) in Dunaliella sauna. The bacterium was identified as Alteromonas macleodii based on analysis of its 16S rRNA gene sequence. When no As(V) was added, A. macleodii significantly enhanced the growth of D. salina, irrespective of PO43- nutrition levels, but this effect was reversed after As(V)+PO43- treatment (1.12 mg L-1) for 3 days. Arsenic (As) absorption by the non-axenic D. salina was significantly higher than that by its axenic counterpart during incubation with 1.12 mg L-1 PO43-. However, when the culture was treated with 0.112 mg L-1 PO43-, As(V) reduction and its subsequent arsenite (As(III)) excretion by non-axenic D. sauna were remarkably enhanced, which, in turn, contributed to lower As absorption in non-axenic algal cells from days 7 to 9. Moreover, dimethylarsinic acid was synthesized by D. sauna alone, and the rates of its production and excretion were accelerated when the PO43- concentration was 0.112 mg L-1. Our data demonstrate that A. macleodii strongly affected As toxicity, uptake, and speciation in D. salina, and these impacts were mediated by PO43- in the cultures. (C) 2016 Elsevier B.V. All, rights reserved.

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