Bioavailability of trace elements in plants in relation to chemical speciation: a case study with pickleweed (Salicornia bigelovii)
Pickleweed or dwarf saltwort (Salicornia bigelovii Torr.) is the first commercial crop that can grow in soil irrigated by seawater. Pickleweed succulent shoots are edible and accumulate high levels of iodine, zinc, iron and selenium, while pickleweed seeds contain about 30％ of highly polyunsaturated vegetable oil. Previous studies have demonstrated that pickleweed species can also be cultured in selenium-contaminated and salt-laden agricultural soils in the San Joaquin Valley. It has been suggested that pickleweed be an economically important crop species for the reclamation and use of salinized agricultural lands worldwide. To enhance the nutritional value of pickleweed in selenium-laden agricultural soils, this study investigated the effect of different chemical species on selenium accumulation in pickleweed shoots. Results showed that when selenium was supplied as selenate in the soil, more selenium accumulated in shoots compared with the other chemical forms of selenite and selenomethionine. XAS analysis showed that pickleweed has the superior ability of transforming inorganic selenate to organic selenium compounds such as selenocystein and selenomethionine. Therefore, via the biotransformation of selenate from agricultural soils, pickleweed diets provide more biologically available and effective organic selenium to wildlife and humans.
Bioavailability accumulation selenium speciation biotransformation Salicornia bigelovii
Z. Q. Lin A. Bradley Duthie
Environmental Sciences Program & Department of Biological Sciences, Southern Illinois University Edwardsville, Illinois 62026-1651, USA
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
275-276
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）