Spatial distribution of cadmium in leaves of metal hyperaccumulating Thlaspi praecox using micro-PIXE |
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| Authors: | Vogel-Mikus Katarina Regvar Marjana Mesjasz-Przybyłowicz Jolanta Przybyłowicz Wojciech J Simcic Jure Pelicon Primoz Budnar Milos |
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| Affiliation: | Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana, Slovenia;;Materials Research Group, iThemba LABS, PO Box 722, Somerset West 7129, South Africa;;Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland;;Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia |
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| Abstract: | * Localization of cadmium (Cd) and other elements was studied in the leaves of the field-collected cadmium/zinc (Cd/Zn) hyperaccumulator Thlaspi praecox from an area polluted with heavy metals near a lead mine and smelter in Slovenia, using micro-PIXE (proton-induced X-ray emission). * The samples were prepared using cryofixation. Quantitative elemental maps and average concentrations in whole-leaf cross-sections and selected tissues were obtained. * Cd was preferentially localized in the lower epidermis (820 microg g(-1) DW), vascular bundles and upper epidermis, whereas about twice the lower concentrations were found in the mesophyll. * Taking into account the large volume of the mesophyll compared with the epidermis, the mesophyll is indicated as a relatively large pool of Cd, possibly involved in Cd detoxification/dilution at the tissue and cellular level. |
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| Keywords: | cadmium (Cd) dynamic analysis metal hyperaccumulation mineral nutrients nuclear microprobe Thlaspi praecox true elemental mapping X-ray micronalysis |
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