Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/44612
標題: Differential expression and regulation of iron-regulated metal transporters in Arabidopsis halleri and Arabidopsis thaliana - the role in zinc tolerance
作者: Shanmugam, V.
王尚禮
Lo, J.C.
Wu, C.L.
Wang, S.L.
Lai, C.C.
Connolly, E.L.
Huang, J.L.
Yeh, K.C.
關鍵字: Arabidopsis halleri
hyperaccumulator
iron homeostasis
IRT1
zinc
tolerance
hyperaccumulator thlaspi-caerulescens
ferric-chelate reductase
nonmetallicolous populations
deficiency response
plant-responses
accumulation
homeostasis
cadmium
genes
overexpression
期刊/報告no:: New Phytologist, Volume 190, Issue 1, Page(s) 125-137.
摘要: P>To avoid zinc (Zn) toxicity, plants have developed a Zn homeostasis mechanism to cope with Zn excess in the surrounding soil. In this report, we uncovered the difference of a cross-homeostasis system between iron (Fe) and Zn in dealing with Zn excess in the Zn hyperaccumulator Arabidopsis halleri ssp. gemmifera and nonhyperaccumulator Arabidopsis thaliana. Arabidopsis halleri shows low expression of the Fe acquisition and deficiency response-related genes IRT1 and IRT2 compared with A. thaliana. In A. thaliana, lowering the expression of IRT1 and IRT2 through the addition of excess Fe to the medium increases Zn tolerance. Excess Zn induces significant Fe deficiency in A. thaliana and reduces Fe accumulation in shoots. By contrast, the accumulation of Fe in shoots of A. halleri was stable under various Zn treatments. Root ferric chelate reductase (FRO) activity and expression of FIT are low in A. halleri compared with A. thaliana. Overexpressing a ZIP family member IRT3 in irt1-1, rescues the Fe-deficient phenotype. A fine-tuned Fe homeostasis mechanism in A. halleri maintains optimum Fe level by Zn-regulated ZIP transporters and prevents high Zn uptake through Fe-regulated metal transporters, and in part be responsible for Zn tolerance.
URI: http://hdl.handle.net/11455/44612
ISSN: 0028-646X
文章連結: http://dx.doi.org/10.1111/j.1469-8137.2010.03606.x
Appears in Collections:土壤環境科學系

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