Cadmium uptake, translocation and tolerance in the hyperaccumulator Arabidopsis halleri

A - Papers appearing in refereed journals

Zhao, F-J., Jiang, R. F., Dunham, S. J. and McGrath, S. P. 2006. Cadmium uptake, translocation and tolerance in the hyperaccumulator Arabidopsis halleri. New Phytologist. 172 (4), pp. 646-654.

AuthorsZhao, F-J., Jiang, R. F., Dunham, S. J. and McGrath, S. P.
Abstract

Arabidopsis halleri is a well-known zinc (Zn) hyperaccumulator, but its status as a cadmium (Cd) hyperaccumulator is less certain. Here, we investigated whether A. halleri can hyperaccumulate Cd and whether Cd is transported via the Zn pathway. Growth and Cd and Zn uptake were determined in hydroponic experiments with different Cd and Zn concentrations. Short-term uptake and root-to-shoot transport were measured with radioactive Cd-109 and Zn-65 labelling. A. halleri accumulated > 1000 mg Cd kg(-1) in shoot dry weight at external Cd concentrations >= 5 mu m>, but the short-term uptake rate of Cd-109 was much lower than that of Zn-65. Zinc inhibited short-term Cd-109 uptake kinetics and root-to-shoot translocation, as well as long-term Cd accumulation in shoots. Uptake of Cd-109 and Zn-65 were up-regulated, respectively, by low iron (Fe) or Zn status. A. halleri was much less tolerant to Cd than to Zn. We conclude that A. halleri is able to hyperaccumulate Cd partly, at least, through the Zn pathway, but the mechanisms responsible for cellular Zn tolerance cannot detoxify Cd effectively.

KeywordsPlant Sciences
Year of Publication2006
JournalNew Phytologist
Journal citation172 (4), pp. 646-654
Digital Object Identifier (DOI)doi:10.1111/j.1469-8137.2006.01867.x
PubMed ID17096791
Open accessPublished as non-open access
Funder project or code512
ISSN0028646X
PublisherWiley

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