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Type: Journal article
Title: Evolution of nickel hyperaccumulation by Stackhousia tryonii (Celastraceae), a serpentinite-endemic plant from Queensland, Australia
Author: Burge, Dylan O.
Barker, William Robert
Citation: Australian Systematic Botany, 2010; 23(6):415-430
Publisher: CSIRO Publishing
Issue Date: 2010
ISSN: 1030-1887
School/Discipline: School of Earth and Environmental Sciences : Ecology and Evolutionary Biology
Statement of
Dylan O. Burge and W. R. Barker
Abstract: To elucidate the evolutionary origin of nickel (Ni) hyperaccumulation by the Australian serpentinite-endemic plant Stackhousia tryonii Bailey, phylogenetic analyses of chloroplast and nuclear DNA for Stackhousia and its close relatives were combined with assays of plant-tissue Ni concentrations. Thirty-five plants from 20 taxa were analysed by sequencing nuclear rDNA (ITS) and the plastid trnL–F region. Phylogenetic analysis of sequence data was conducted under maximum parsimony and Bayesian search criteria. In all, 100 plants from 39 taxa, including all 33 Stackhousia species, were analysed for Ni concentration by radial inductively coupled plasma atomic-emission spectrometry (ICP–AES). In phylogenetic analyses, S. tryonii was monophyletic, nested within a monophyletic Stackhousia. Only S. tryonii contained concentrations of Ni above the hyperaccumulation threshold (0.1%; 1000 ppm), containing between 0.25% (2500 ppm) and 4.1% (41 000 ppm) Ni by dry weight. Nickel-hyperaccumulation ability appears to have been acquired once during diversification of Stackhousia, by S. tryonii.
Rights: © CSIRO
RMID: 0020102123
DOI: 10.1071/SB10029
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Appears in Collections:Ecology, Evolution and Landscape Science publications

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