期刊
BIOLOGICAL TRACE ELEMENT RESEARCH
卷 131, 期 2, 页码 165-176出版社
SPRINGERNATURE
DOI: 10.1007/s12011-009-8360-7
关键词
Cobalt; Xylem sap; Organic acids; Nitrate; Alyssum murale; Trifolium subterraneum
资金
- National Programs for High Technology Research and Development of China [2007AA10Z406]
- Research Fund for the Doctoral Program of Higher Education [20070307051]
- Foundation for Talent Recommendation Program of Nanjing Agricultural University [030-804076]
Roles of organic acids and nitrate in the long-distance transport of cobalt (Co) in xylem saps of hyperaccumulator Alyssum murale and non-hyperaccumulator Trifolium subterraneum were studied under hydroponic conditions. Organic acids (oxalic, malic, malonic, citric, and fumaric) and nitrate in xylem sap samples were separated and determined simultaneously by reversed-phase high performance liquid chromatography after solid-phase extraction with nanosized hydroxyapatite. Results indicated that Co treatment significantly increased the concentrations of xylem oxalic and malic acids for the hyperaccumulator A. murale compared to the control but significantly decreased the concentrations of xylem nitrate and malonic acid; concentrations of citric acid in xylem sap samples did not show significant difference between the control and Co treatments. By analyzing the relationship between the concentrations of organic acids, nitrate, and concentrations of Co in xylem saps, it could be concluded that oxalic and malic acids in xylem saps seemed to participate in the long-distance Co translocation process, and citric acid did not relate to the xylem Co transport of A. murale and T. subterraneum. Our work might be very useful for understanding the mechanism of long-distance transport of heavy metals in hyperaccumulator.
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