Abstract
Aims
This study aimed to establish elemental profiles and to spatially resolve the elemental distribution in five New Caledonian woody Ni hyperaccumulator plant species (Geissois pruinosa var. pruinosa, Homalium francii, Hybanthus austrocaledonicus, Psychotria gabriellae, and Pycnandra acuminata) originating from the Cunoniaceae, Salicaceae, Violaceae, Rubiaceae, and Sapotaceae families respectively.
Methods
Using synchrotron-based micro-X-ray Fluorescence (μXRF) imaging of different plant tissues, from the roots to the shoots and reproductive organs, this study aimed to clarify how distribution patterns of nickel, and other physiologically relevant elements, differ between these species.
Results
The results show that the tissue-level and cellular-level distribution of nickel in P. gabriellae, H. austrocaledonicus, G. pruinosa var. pruinosa, and H. francii conform with the majority of studied Ni hyperaccumulator plant species globally, including (temperate) herbaceous species, with localization mainly in epidermal cells and phloem bundles. However, P. acuminata has nickel-rich laticifers, which constitute an independent network of cells that is parallel to the vascular bundles and are the main sink for nickel.
Conclusions
Synchrotron-based micro-X-ray Fluorescence (μXRF) is a powerful method for investigating how metal hyperaccumulation influences acquisition and spatial distribution of a wide range of elements. This non-invasive method enables investigation into the in vivo distribution of multiple elements and the structure and organisation of cells (e.g. laticifers).
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Acknowledgements
The authors thank the Province Sud de Nouvelle-Calédonie for permission to collect the plant material samples (permits 1503-2016/ARR/DENV and 1206-2018/ARR/DENV), and S. Palermo for access to Monts des Koghis. This research was undertaken at P06 at DESY, a member of the Helmholtz Association (HGF). We would like to thank Gerald Falkenberg for assistance with the experiments. The research leading to this result has been supported by the project CALIPSOplus under the Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. A. van der Ent was the recipient of a Discovery Early Career Researcher Award (DE160100429) from the Australian Research Council. V. Gei was the recipient of an Australia Awards PhD Scholarship from the Australian Federal Government.
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Gei, V., Echevarria, G., Erskine, P.D. et al. Soil chemistry, elemental profiles and elemental distribution in nickel hyperaccumulator species from New Caledonia. Plant Soil 457, 293–320 (2020). https://doi.org/10.1007/s11104-020-04714-x
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DOI: https://doi.org/10.1007/s11104-020-04714-x