期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 65, 期 2-3, 页码 363-368出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2008.11.013
关键词
Arsenic; Antagonistic; Chinese brake fern; Interactive effects; Selenium; Orthogonal rotation regression design
资金
- National Science Foundation of China [20477045, 40271099]
- Natural Resources Research, Chinese Academy of Sciences [CXIOG-C04-02]
The interactive effects of selenium (Se) and arsenic (As) on plant uptake of Se and As have rarely been documented. In this study, the interactive effects of As and Se on their uptake by Chinese brake fern (Pteris vittata), an As-hyperaccumulator and Se-accumulator, were explored in two hydroponic experiments based on a two-factor, five-level central composite design. At Se levels of less than 2.5 mgL(-1), increasing amounts of As stimulated the uptake of Se in Chinese brake fern roots, possibly because of the beneficial effects of Se. In contrast, at Se concentrations greater than 2.5 mgL(-1), As suppressed the uptake of Se in Chinese brake fern roots. Uptake of As by both fronds and roots of Chinese brake fern was suppressed by the addition of Se, indicating the antagonistic effects of Se on As. in addition, at Se concentrations of less than 2.5 mgL(-1), As stimulated the translocation of Se from roots to fronds; meanwhile, the addition of Se resulted in reduced translocation of As from roots to fronds. These findings demonstrate the interactive effects of As and Se on their uptake by Chinese brake fern. (C) 2008 Elsevier B.V. All rights reserved.
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