期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 318, 期 -, 页码 443-451出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.07.031
关键词
Dunaliella saline; Symbiotic bacteria; Arsenate; Phosphate; Metabolism
资金
- National Natural Science Foundation of China [31400450, 41371468]
- Fundamental Research Funds for the Central Universities [KJQN201533]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Provincial Graduate Student Innovation Project [KYZZ_0182]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据