文献类型： 外文期刊

作者： Zhang, Xin ¹ ; Lin, Ai-Jun ² ; Zhao, Fang-Jie ³ ; Xu, Guo-Zhong ⁴ ; Duan, Gui-Lan ¹ ; Zhu, Yong-Guan ¹ ;

作者机构： 1.Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Urban & ONAL Ecol, Beijing 100085, Peoples R China

2.Beijing Univ Chem Technol, Dept Environm Sci & Engn, Beijing 100029, Peoples R China

3.Rothamsted Res, Dept Soil Sci, Harpenden AL5 2JQ, Herts, England

4.Fujian Acad Agr Sci, Agr Ecol Inst, Fuzhou 350013, Peoples R China

5.Chinese Acad Sci, Inst Urban Environm, Xiamen 361003, Peoples R China

关键词： arsenic;as speciation;as tolerance;as uptake;azolla;accumulation;detoxification

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

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收录情况： SCI

摘要： This study investigates As accumulation and tolerance of the aquatic fern Azolla. Fifty strains of Azolla showed a large variation in As accumulation. The highest- and lowest-accumulating ferns among the 50 strains were chosen for further investigations. Azolla caroliniana accumulated two times more As than Azolla filiculoides owing to a higher influx velocity for arsenate. A. filiculoides was more resistant to external arsenate due to a lower uptake. Both strains showed a similar degree of tolerance to internal As. Arsenate and arsenite were the dominant As species in both Azolla strains, with methlyated As species accounting for <5% of the total As. A. filiculoides had a higher proportion of arsenite than A. caroliniana. Both strains effluxed more arsenate than arsenite, and the amount of As efflux was proportional to the amount of As accumulation. The potential of growing Azolla in paddy fields to reduce As transfer from soil and water to rice should be further evaluated.