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Enhanced cadmium efflux and root‐to‐shoot translocation are conserved in the hyperaccumulator Sedum alfredii (Crassulaceae family)
Author(s) -
Zhang Zhongchun,
Yu Qi,
Du Hanying,
Ai Wenli,
Yao Xuan,
MendozaCózatl David G.,
Qiu Baosheng
Publication year - 2016
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1002/1873-3468.12225
Subject(s) - hyperaccumulator , crassulaceae , cadmium , sedum , efflux , chromosomal translocation , shoot , brassicaceae , botany , phytoremediation , biology , chemistry , biochemistry , environmental chemistry , heavy metals , gene , organic chemistry
Investigation on the molecular mechanisms of cadmium hyperaccumulation has been mostly focused on members of the Brassicaceae family. Here, we show using hyperaccumulating ( HP ) and nonhyperaccumulating ( NHP ) populations of Sedum alfredii (Crassulaceae), that Cd hypertolerance correlates with higher Cd efflux rates and less cadmium accumulation in suspension cells and roots. The heavy metal ATP ase HMA 2, but not HMA 4, was highly expressed in suspension cultures and roots from HP plants compared to NHP cells and plants. Reciprocal grafting also showed that Cd translocation is more efficient in HP plants. These results suggest that cadmium efflux is a conserved mechanism among natural cadmium hyperaccumulator species.