Zinc isotope fractionation during grain filling of wheat and a comparison of zinc and cadmium isotope ratios in identical soil-plant systems

Wiggenhauser, Matthias; Bigalke, Moritz; Imseng, Martin; Keller, Armin; Archer, Corey; Wilcke, Wolfgang; Frossard, Emmanuel (2018). Zinc isotope fractionation during grain filling of wheat and a comparison of zinc and cadmium isotope ratios in identical soil-plant systems. New Phytologist, 219(1), pp. 195-205. Wiley-Blackwell 10.1111/nph.15146

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Remobilization of Zn from shoot to grain contributes significantly to Zn grain concentrations and thereby to food quality. On the other hand, strong accumulation of Cd in grain is detrimental for food quality. Zn concentrations and isotope ratios were measured in wheat shoots (Triticum aestivum L.) at different growth stages to elucidate Zn pathways and processes in the shoot during grain filling. Zinc mass significantly decreased while heavy Zn isotopes accumulated in straw during grain filling (Δ66Znfullmaturity-flowering = 0.21 to 0.31 ‰). Three quarters of the Zn mass in the shoot moved to the grains, which were enriched in light Zn isotopes relative to the straw (Δ66Zngrain-straw -0.21 to -0.31 ‰). Light Zn isotopes accumulated in phloem sinks while heavy isotopes were retained in phloem sources likely because of apoplastic retention and compartmentalization. Unlike for Zn, an accumulation of heavy Cd isotopes in grains has previously been shown. The opposing isotope fractionation of Zn and Cd might be caused by distinct affinities of Zn and Cd to O, N and S ligands. Thus, combined Zn and Cd isotope analysis provides a novel tool to study biochemical processes that separate these elements in plants.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography > Unit Soil Science

UniBE Contributor:

Bigalke, Moritz

Subjects:

900 History > 910 Geography & travel

ISSN:

0028-646X

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Moritz Bigalke

Date Deposited:

24 May 2018 11:54

Last Modified:

27 Apr 2019 02:30

Publisher DOI:

10.1111/nph.15146

BORIS DOI:

10.7892/boris.116616

URI:

https://boris.unibe.ch/id/eprint/116616

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