Iron and zinc isotope fractionation during uptake and translocation in rice (Oryza sativa) grown in oxic and anoxic soils
Arnold, Tim LU
; Markovic, Tamara
; Kirk, Guy J.D.
; Schönbächler, Maria
; Rehkämper, Mark
; Zhao, Fangjie J.
and Weiss, Dominik J.
(2015)
In Comptes Rendus - Geoscience
347(7-8).
p.397-404
- Abstract
Stable isotope fractionation is emerging quickly as a powerful novel technique to study metal uptake and translocation in plants. Fundamental to this development is a thorough understanding of the processes that lead to isotope fractionation under differing environmental conditions. In this study, we investigated Zn and Fe isotope fractionation in rice grown to maturity in anaerobic and aerobic soils under greenhouse conditions. The overall Zn isotope fractionation between the soil and above ground plant material was negligible in aerobic soil but significant in anaerobic soil with isotopically lighter Zn in the rice plant. The observed range of fractionation is in line with previously determined fractionations of Zn in rice grown in... (More)
Stable isotope fractionation is emerging quickly as a powerful novel technique to study metal uptake and translocation in plants. Fundamental to this development is a thorough understanding of the processes that lead to isotope fractionation under differing environmental conditions. In this study, we investigated Zn and Fe isotope fractionation in rice grown to maturity in anaerobic and aerobic soils under greenhouse conditions. The overall Zn isotope fractionation between the soil and above ground plant material was negligible in aerobic soil but significant in anaerobic soil with isotopically lighter Zn in the rice plant. The observed range of fractionation is in line with previously determined fractionations of Zn in rice grown in hydroponic solutions and submerged soils and emphasizes the effect of taking up different chemical forms of Zn, most likely free and organically complexed Zn. The Zn in the grain was isotopically lighter than in the rest of the above ground plant in rice grown in aerobic and anaerobic soils alike. This suggests that in the course of the grain loading and during the translocation within the plant important biochemical and/or biophysical processes occur. The isotope fractionation observed in the grains would be consistent with an unidirectional controlled transport from shoot to grain with a fractionation factor of α ≈ 0.9994. Iron isotopes showed an isotopic lighter signature in shoot and grain compared to the bulk soil or the leachate in aerobic and anaerobic soils alike. The negative direction of isotopic fractionation is consistent with possible changes in the redox state of Fe occurring during the uptake and translocation processes. The isotope fractionation pattern between shoots and grain material are different for Zn and Fe which finally suggests that different mechanisms operate during translocation and grain-loading in rice for these two key micronutrients.
(Less)
- author
- Arnold, Tim
LU
; Markovic, Tamara
; Kirk, Guy J.D.
; Schönbächler, Maria
; Rehkämper, Mark
; Zhao, Fangjie J.
and Weiss, Dominik J.
- publishing date
- 2015-11-01
- type
- Contribution to journal
- publication status
- published
- keywords
- Anaerobic Soils, Iron, Isotopes, Rice (Oryza sativa), Zinc
- in
- Comptes Rendus - Geoscience
- volume
- 347
- issue
- 7-8
- pages
- 8 pages
- publisher
- Academie des sciences
- external identifiers
-
- scopus:84950978116
- ISSN
- 1631-0713
- DOI
- 10.1016/j.crte.2015.05.005
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2015 Académie des sciences.
- id
- eb480348-4ae7-4088-a887-25fc8852f26a
- date added to LUP
- 2024-10-24 18:28:06
- date last changed
- 2025-04-25 10:37:59
@article{eb480348-4ae7-4088-a887-25fc8852f26a,
abstract = {{<p>Stable isotope fractionation is emerging quickly as a powerful novel technique to study metal uptake and translocation in plants. Fundamental to this development is a thorough understanding of the processes that lead to isotope fractionation under differing environmental conditions. In this study, we investigated Zn and Fe isotope fractionation in rice grown to maturity in anaerobic and aerobic soils under greenhouse conditions. The overall Zn isotope fractionation between the soil and above ground plant material was negligible in aerobic soil but significant in anaerobic soil with isotopically lighter Zn in the rice plant. The observed range of fractionation is in line with previously determined fractionations of Zn in rice grown in hydroponic solutions and submerged soils and emphasizes the effect of taking up different chemical forms of Zn, most likely free and organically complexed Zn. The Zn in the grain was isotopically lighter than in the rest of the above ground plant in rice grown in aerobic and anaerobic soils alike. This suggests that in the course of the grain loading and during the translocation within the plant important biochemical and/or biophysical processes occur. The isotope fractionation observed in the grains would be consistent with an unidirectional controlled transport from shoot to grain with a fractionation factor of α ≈ 0.9994. Iron isotopes showed an isotopic lighter signature in shoot and grain compared to the bulk soil or the leachate in aerobic and anaerobic soils alike. The negative direction of isotopic fractionation is consistent with possible changes in the redox state of Fe occurring during the uptake and translocation processes. The isotope fractionation pattern between shoots and grain material are different for Zn and Fe which finally suggests that different mechanisms operate during translocation and grain-loading in rice for these two key micronutrients.</p>}},
author = {{Arnold, Tim and Markovic, Tamara and Kirk, Guy J.D. and Schönbächler, Maria and Rehkämper, Mark and Zhao, Fangjie J. and Weiss, Dominik J.}},
issn = {{1631-0713}},
keywords = {{Anaerobic Soils; Iron; Isotopes; Rice (Oryza sativa); Zinc}},
language = {{eng}},
month = {{11}},
number = {{7-8}},
pages = {{397--404}},
publisher = {{Academie des sciences}},
series = {{Comptes Rendus - Geoscience}},
title = {{Iron and zinc isotope fractionation during uptake and translocation in rice (Oryza sativa) grown in oxic and anoxic soils}},
url = {{http://dx.doi.org/10.1016/j.crte.2015.05.005}},
doi = {{10.1016/j.crte.2015.05.005}},
volume = {{347}},
year = {{2015}},
}