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Coupling nickel chemical speciation and isotope ratios to decipher nickel dynamics in the Rinorea cf. bengalensis-soil system in Malaysian Borneo

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Abstract

Aims. Rinorea cf. bengalensis is a Ni hyperaccumulator which occurs in Sabah (Malaysia), on Borneo Island, that is able to accumulate considerable amounts of Ni and influences the Ni cycle in surface soil layers, both in terms of Ni concentration and Ni isotopic composition. In this study, the biogeochemical processes underpinning Ni isotopic fractionation in the soil-plant system and the mechanisms regulating Ni homeostasis in R. cf. bengalensis plants were elucidated.

Methods

Two specimens of R. cf. bengalensis of different ages and associated surface soils were collected from ultramafic soils in Sabah. Soil mineralogy, Ni concentrations, speciation and isotopic signatures were subsequently determined in plant and soil samples.

Results

Nickel in R. cf. bengalensis leaves is mainly complexed with citrate. Soil Ni available fractions have different δ60Ni values depending on the Ni bearing phases. Rinorea cf. bengalensis specimens take up lighter Ni isotopes and a pronounced isotopic fractionation within the plant is observed, especially in the young specimen.

Conclusions

The results suggest that the observed fractionation in the young plant can be attributable to kinetic effects (lighter isotopes move faster), which become less evident in the older specimen, as Ni is redistributed and homogenized through phloem loading and unloading processes.

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Acknowledgements

We thank Sabah Parks for granting permission to conduct research in Kinabalu Park, and the Sabah Biodiversity Council for research permits. A. van der Ent is the recipient of a Discovery Early Career Researcher Award (DE160100429) from the Australian Research Council. We thank Emile Benizri, Séverine Lopez, Celestino Quintela-Sabaris and Sukaibin Sumail for their support during sampling campaign. We acknowledge IJL and Mrs. Migot for access to TEM facilities. Parts of this research were carried out at SAMBA beamline at SOLEIL, and at XAFS beamline from ELETTRA Synchrotron facility. We would like to thank Emiliano Fonda (SOLEIL), Luca Olivi (ELETTRA) for assistance during 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. The authors would like to thank Agence Nationale de la Recherche (ANR) project number ANR-14-CE04-0005-03 (AGROMINE) for funding. This is CRPG contribution N°2567. The authors also would like to thank the two anonymous reviewers for their useful suggestions that helped improving the quality of the manuscript.

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Correspondence to I. O. Zelano.

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Responsible Editor: Juan Barcelo.

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Zelano, I.O., Cloquet, C., van der Ent, A. et al. Coupling nickel chemical speciation and isotope ratios to decipher nickel dynamics in the Rinorea cf. bengalensis-soil system in Malaysian Borneo. Plant Soil 454, 225–243 (2020). https://doi.org/10.1007/s11104-020-04541-0

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  • DOI: https://doi.org/10.1007/s11104-020-04541-0

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