Cadmium uptake and distribution in Arabidopsis thaliana exposed to low chronic concentrations depends on plant growth

This study tested the hypothesis that Cd uptake is correlated with the shoot or root growth of Arabidopsis thaliana ecotype Columbia cultivated hydroponically at environmentally relevant Cd concentrations: 20, 100 and 350 nmol L⁻¹. Growth of both roots and shoots were delayed at 350 nmol L⁻¹. The ra...

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Bibliographic Details
Published in:Plant and soil 2009-09, Vol.322 (1-2), p.239-249
Main Authors: Dauthieu, Maxime, Denaix, Laurence, Nguyen, Christophe, Panfili, Frederic, Perrot, Frederic, Potin-Gautier, Martine
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Animal, plant and microbial ecology
Arabidopsis thaliana
Biodiversity and Ecology
Biological and medical sciences
Biomedical and Life Sciences
Cadmium
Cadmium partitioning
Cadmium uptake
Ecology
Environmental Sciences
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Hydroponics
Leaf maturity
Leaves
Life Sciences
Nutrient solutions
Plant biology
Plant growth
Plant Physiology
Plant roots
Plant Sciences
Plants
Radioactive decay
Regular Article
Root growth
Root growth rate
Shoots
Soil and water pollution
Soil science
Soil Science & Conservation
Soil solution
Soil-plant relationships. Soil fertility
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Transpiration
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Summary:This study tested the hypothesis that Cd uptake is correlated with the shoot or root growth of Arabidopsis thaliana ecotype Columbia cultivated hydroponically at environmentally relevant Cd concentrations: 20, 100 and 350 nmol L⁻¹. Growth of both roots and shoots were delayed at 350 nmol L⁻¹. The rate of Cd uptake determined by spiking the nutrient solution with ¹⁰⁹Cd for 24 h, was significantly correlated with the root growth rate. The fraction of Cd absorbed that was allocated to shoots was constant with time but decreased with increasing exposure to Cd. Autoradiography and gamma counting showed that Cd was preferentially allocated to developing leaves. Hence, the quantity of Cd in shoots depended both on the root growth, which probably governed the uptake, and on the maturity of the leaves, which may have determined the Cd allocated to shoots through changes in the transpiration stream.
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-009-9912-5