Root responses to soil Ni heterogeneity in a hyperaccumulator and a non-accumulator species |
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| Authors: | Ahmad B Moradi Héctor M Conesa Brett H Robinson Eberhard Lehmann Anders Kaestner Rainer Schulin |
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| Institution: | 1. Instituto Superior de Agronomia, Departamento dos Recursos Naturais, Ambiente e Território, Tapada da Ajuda, 1349-017 Lisboa, Portugal;2. Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, PO Box 3046, 3001-401 Coimbra, Portugal;1. Institute of Earth and Environmental Science, University of Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany;2. Institute of Environmental Research of the Faculty of Chemistry and Chemical Biology, Dortmund University of Technology, Otto-Hahn-Str. 6, 44227 Dortmund, Germany |
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| Abstract: | We compared root responses of the Ni-hyperaccumulator plant Berkheya coddii Rossler with the non-accumulator plant Cicer arietinum L. to Ni heterogeneity in soil. We grew plants in growth containers filled with control soil, homogeneously spiked, and heterogeneously spiked soil with Ni concentrations of 62 and 125 mg kg?1. Neutron radiography (NR) was used to observe the root distribution and the obtained images were analysed to reveal the root volumes in the spiked and unspiked segments of the growth container. There was no significant difference in root distribution pattern of B. coddii among different concentrations of Ni. Unlike B. coddii, the roots of C. arietinum initially grew into the spiked segments. However, the later developing roots did not penetrate the spiked segment suggesting an avoidance strategy. Our results indicate that, B. coddii does not forage towards the Ni-rich patches, although presence of Ni in soil changes its root morphology. |
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