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Elevated root nicotianamine concentrations are critical for Zn hyperaccumulation across diverse edaphic environments

Title data

Uraguchi, Shimpei ; Weber, Michael ; Clemens, Stephan:
Elevated root nicotianamine concentrations are critical for Zn hyperaccumulation across diverse edaphic environments.
In: Plant, Cell & Environment. (26 February 2019) .
ISSN 1365-3040
DOI: https://doi.org/10.1111/pce.13541

Abstract in another language

The metallophyte Arabidopsis halleri thrives across an extremely broad edaphic range. Zn hyperaccumulation is found on soils differing in available Zn by up to six orders of magnitude, raising the question as to whether a common set of mechanisms confers this species‐wide ability. Elevated root concentrations of the metal chelator nicotianamine due to strong constitutive expression of AhNAS2 are important for hyperaccumulation. In order to analyse the relevance of AhNAS2 under more natural conditions representing a range of metalliferous and nonmetalliferous habitats, we collected soil at eight different A. halleri sites and cultivated wild‐type and AhNAS2‐RNAi lines in these soils. AhNAS2 transcript abundance and root nicotianamine concentrations in wild‐type plants were barely influenced by soil metal concentrations. The RNAi effect was fully expressed in different soils. Zn hyperaccumulation in AhNAS2‐silenced lines was significantly reduced in seven soils. Root‐to‐shoot translocation of Cd, Mn, Cu, Ni, and Co was also affected by AhNAS2 silencing, albeit to a lower extent and less consistently. Leaf Fe levels were unaffected by AhNAS2 knockdown. Results demonstrate that elevated nicotianamine production in roots of A. halleri is a Zn hyperaccumulation factor regardless of the edaphic environment, that is, contributes to Zn hyperaccumulation in soils with contrasting Zn availability.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER150165
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Physiology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Physiology > Chair Plant Physiology - Univ.-Prof. Dr. Stephan Clemens
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 28 Mar 2019 07:43
Last Modified: 28 Mar 2019 07:43
URI: https://eref.uni-bayreuth.de/id/eprint/48108