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Cadmium uptake, translocation and tolerance in the hyperaccumulator Arabidopsis halleri
Author(s) -
Zhao F. J.,
Jiang R. F.,
Dunham S. J.,
McGrath S. P.
Publication year - 2006
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2006.01867.x
Subject(s) - hyperaccumulator , cadmium , shoot , chromosomal translocation , zinc , biology , botany , phytoremediation , hydroponics , arabidopsis , environmental chemistry , chemistry , heavy metals , biochemistry , gene , organic chemistry , mutant
Summary• 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 109 Cd and 65 Zn labelling. • A. halleri accumulated > 1000 mg Cd kg −1 in shoot dry weight at external Cd concentrations ≥ 5 µ m , but the short‐term uptake rate of 109 Cd was much lower than that of 65 Zn. Zinc inhibited short‐term 109 Cd uptake kinetics and root‐to‐shoot translocation, as well as long‐term Cd accumulation in shoots. Uptake of 109 Cd and 65 Zn 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.