Cobalt hyperaccumulation in Rinorea cf. bengalensis (Violaceae) from Sabah: accumulation potential and tissue and cellul
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Cobalt hyperaccumulation in Rinorea cf. bengalensis (Violaceae) from Sabah: accumulation potential and tissue and cellular-level distribution of cobalt Adrian L. D. Paul & Philip Nti Nkrumah & Guillaume Echevarria & Peter D. Erskine & Rufus L. Chaney & Kathryn M. Spiers & Sukaibin Sumail & Antony van der Ent
Received: 12 February 2020 / Accepted: 29 June 2020 # Springer Nature Switzerland AG 2020
Abstract Aims Knowledge on the ecophysiology of cobalt hyperaccumulator species is limited. The nickel hyperaccumulator Rinorea cf. bengalensis from Borneo can accumulate high concentrations of cobalt in nature. This study investigates the cobalt accumulation potential of Rinorea cf. bengalensis in relation to nickel concentrations in soils and the subsequent tissue and cellular-level distributions of cobalt, nickel and major cations. Methods Seedlings of Rinorea cf. bengalensis were grown in mixed treatments on ultramafic soil containing a high concentration of available nickel. Cobalt and nickel salts were then added to the soil to study their interactions. The tissue and cellular-level distributions of cobalt, calcium, nickel, and potassium were investigated using synchrotron-based X-ray fluorescence microscopy.
Results The maximum foliar cobalt concentration reached 1200 μg g−1. Accumulation of cobalt competed with nickel accumulation although nickel seems to stimulate cobalt phloem translocation. Plants suffered toxicity in the treatment with the highest soil cobalt concentration. Cobalt and nickel have contrasting distribution patterns in the leaves of Rinorea cf. bengalensis, with cobalt mainly excreted on the surface of the leaves, whereas nickel is localised in foliar epidermal cells. Conclusions Rinorea cf. bengalensis can accumulate high concentrations of cobalt, but is intrinsically more tolerant to nickel. It does not rely on a similar sequestration mechanism for both metals, which could explain the lesser tolerance for cobalt. Nickel appears to be essential for the plant to tolerate high cobalt concentrations. Further studies intending to develop agronomic
Responsible Editor: Fangjie Zhao. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04629-7) contains supplementary material, which is available to authorized users. A. L. D. Paul : P. N. Nkrumah : P. D. Erskine : A. van der Ent Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, Brisbane, Queensland, Australia G. Echevarria : A. van der Ent (*) Laboratoire Sols et Environnement, UMR 1120, Université de Lorraine-INRAE, Vandœuvre-lès-Nancy, Grand Est, France e-mail: [email protected]
R. L. Chaney Chaney Environmental, Beltsville, Maryland, USA K. M. Spiers Photon Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany S. Sumail Sabah Parks, Herbarium, Kota Kinabalu, Sabah, Malaysia
Plant Soil
practices are needed to determine the viability of Rinorea cf. bengalensis for nickel-cobalt agromining. Keywords Cobalt . Distri
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