Journal
NEW PHYTOLOGIST
Volume 160, Issue 3, Pages 479-488Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1469-8137.2003.00912.x
Keywords
elemental mapping; metal hyperaccumulation; nickel (Ni); nuclear microprobe analysis; micro-PIXE; quantitative imaging; spot analysis; x-ray analysis
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Metal concentrations within reproductive tissues of metallophytes are rarely reported. Here, the spatial distribution of nickel (Ni) within the fruits (seeds) of the Ni hyperaccumulator Stackhousia tryonii was investigated. Two microanalytical techniques, energy dispersive x-ray spectrometry (EDXS) and nuclear microprobe (micro-proton-induced x-ray emission spectrometry; micro-PIXE) were employed for qualitative and quantitative assessment, respectively, of localized Ni, within the fruits of S. tryonii. The results were compared with quantitative analysis made using inductively coupled plasma-optical emission spectrometry (ICP-OES). Nickel analysis made using micro-PIXE was consistent with bulk (ICP-OES) analysis (at 1800 mug g(-1) d. wt), however, a beam resolution of approx. 2 x 2 mum(2) allowed tissue localization. Nickel was partitioned to the fruit wall (pericarp) (4433 mug g(-1)), while endospermic and cotyledonary tissues possessed little Ni (309 and 182 mug g(-1) d. wt, respectively). This distribution is consistent with the interpretation that principal pathway of Ni movement within the fruit is symplastic rather than apoplastic (as the filial generation lacks symplastic connection with the parent).
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