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

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 bioge...

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Bibliographic Details
Published in:Plant and soil 2020-09, Vol.454 (1-2), p.225-243
Main Authors: Zelano, I. O., Cloquet, C., van der Ent, A., Echevarria, G., Gley, R., Landrot, G., Pollastri, S., Fraysse, F., Montargès-Pelletier, E.
Format: Article
Language:English
Subjects:
Biodiversity and Ecology
Biomedical and Life Sciences
Botanics
Ecology
Environment and Society
Environmental aspects
Environmental Sciences
Global Changes
Life Sciences
Nickel
Physiological aspects
Plant Physiology
Plant Sciences
Plant-soil relationships
Regular Article
Soil mineralogy
Soil Science & Conservation
Vegetal Biology
Violets
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Summary: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 δ 60 Ni 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.
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-020-04541-0