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Cited by 226

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Elevated Nicotianamine Levels in Arabidopsis halleri Roots Play a Key Role in Zinc Hyperaccumulation

Open access
Deinlein, Ulrich, Weber, Michael, Schmidt, Holger, Rensch, Stefan, Trampczynska, Aleksandra, Hansen, Thomas H., Husted, Søren, Schjoerring, Jan K., Talke, Ina N., Krämer, Ute, Clemens, Stephan·2012·The Plant Cell

Abstract

Zn deficiency is among the leading health risk factors in developing countries. Breeding of Zn-enriched crops is expected to be facilitated by molecular dissection of plant Zn hyperaccumulation (i.e., the ability of certain plants to accumulate Zn to levels >100-fold higher than normal plants). The model hyperaccumulators Arabidopsis halleri and Noccaea caerulescens share elevated nicotianamine synthase (NAS) expression relative to nonaccumulators among a core of alterations in metal homeostasis. Suppression of Ah-NAS2 by RNA interference (RNAi) resulted in strongly reduced root nicotianamine (NA) accumulation and a concomitant decrease in root-to-shoot translocation of Zn. Speciation analysis by size-exclusion chromatography coupled to inductively coupled plasma mass spectrometry showed that the dominating Zn ligands in roots were NA and thiols. In NAS2-RNAi plants, a marked increase in Zn-thiol species was observed. Wild-type A. halleri plants cultivated on their native soil showed elemental profiles very similar to those found in field samples. Leaf Zn concentrations in NAS2-RNAi lines, however, did not reach the Zn hyperaccumulation threshold. Leaf Cd accumulation was also significantly reduced. These results demonstrate a role for NAS2 in Zn hyperaccumulation also under near-natural conditions. We propose that NA forms complexes with Zn(II) in root cells and facilitates symplastic passage of Zn(II) toward the xylem.

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Crossref · 10.1105/tpc.111.095000

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Metadata

Authors
Deinlein, U., Weber, M., Schmidt, H., Rensch, S., Trampczynska, A., Hansen, T. H., Husted, S., Schjoerring, J. K., Talke, I. N., Krämer, U., & Clemens, S.
Venue
The Plant Cell
Published
2012-02
Volume
24
Issue
2
Pages
708-723
ISSN
  • 1040-4651 (ISSN-L)
  • 1532-298X
OpenAlex
W2102189122
Cited by
226
References
10
FWCI
26.77
Type
journal article
Language
en
Open access
green

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