Identification and functional analysis of two ZIP metal transporters of the hyperaccumulator Thlaspi caerulescens

文献类型： 外文期刊

第一作者： Wu, Jian

作者： Wu, Jian;Ghandilyan, Artak;Guzman, Myriam Olortegui;Aarts, Mark G. M.;Wu, Jian;Wang, Xiaowu;Zhao, Fang-Jie;Logoteta, Barbara;Schat, Henk

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关键词： analysis;cadmium;exposure;genes;heavy metals;hyperaccumulator plants;hyperaccumulators;identification;metal tolerance;mutants;phenotypes;properties;zinc;Arabidopsis;Arabidopsis thaliana;Thlaspi

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

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收录情况： SCI

摘要： The heavy metal hyperaccumulator Thlaspi caerulescens expresses several ZIP-like genes at higher levels than their orthologues in non-hyperaccumulator species, but it is not clear why. To elucidate the function of the T. caerulescens orthologues of the Arabidopsis thaliana ZIP5 and ZIP6 genes, full-length cDNAs of TcZNT5-LC and TcZNT6-LC were cloned, their expression was examined and genes were expressed in A. thaliana. Transcript level analysis revealed the constitutively high expression of these two genes in T. caerulescens compared to AtZIP5 and AtZIP6 genes and differential expression of both genes when comparing two accessions of T. caerulescens with different metal accumulation properties. Expression of TcZNT5-LC in A. thaliana did not modify Cd or Zn tolerance, but mildly affected the root and shoot Zn concentrations towards a hyperaccumulator shoot to root concentration ratio. A. thaliana zip5 knock-out mutants showed increased tolerance to Cd and decreased seed mineral concentrations. Expression of TcZNT6-LC enhanced the Cd sensitivity of A. thaliana, but no phenotype was observed for the zip6 mutant. In conclusion, the changes in expression of TcZNT5-LC and TcZNT6-LC upon changes in Zn or Cd exposure indicate both genes act in metal homeostasis, but their CaMV 35S-mediated expression in A. thaliana does not create T. caerulescens hyperaccumulator phenotypes.

分类号： S15

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