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Revisiting the iron pools in cucumber roots: identification and localization
Krisztina Kovács1, Jiří Pechoušek2, Libor Machala2
1Institute of Chemistry, Eötvös Loránd University, P.O. Box 32, Budapest, 1512, Hungary. kkriszti@chem.elte.hu.
Planta
|March 23, 2016
Summary
Iron deficiency in Strategy I plants shifts iron from root surfaces to xylem as iron-citrate. This study investigates transient and permanent iron microenvironments in cucumber roots during iron uptake and assimilation.
Area of Science:
- Plant Physiology
- Biochemistry
- Soil Science
Background:
- Plants require iron for essential metabolic processes, but its bioavailability is often limited in soil.
- Strategy I plants, including cucumber, utilize a reduction-based mechanism for iron uptake.
- Understanding iron microenvironments is crucial for optimizing plant iron nutrition.
Purpose of the Study:
- To investigate the transient and permanent iron microenvironments formed during iron uptake and assimilation in cucumber plants.
- To characterize the chemical forms and localization of iron under varying iron supply conditions.
Main Methods:
- (57)Fe Mössbauer spectroscopy for iron microenvironment identification.
- Immunoblotting for protein analysis.
- Reductive washing and high-resolution microscopy for iron localization.
Main Results:
- Under iron deficiency, iron shifts from hydrous ferric oxide on root surfaces to iron-citrate accumulation in the xylem.
- Transient iron-carboxylates and amorphous hydrous ferric oxide/hydroxyde were observed in the apoplast and root surface.
- A significant ferrous microenvironment (Fe(II)-bipyridyl complex) remained in the root apoplast after reductive washing.
Conclusions:
- Strategy I iron deficiency induces a significant shift in iron localization and chemical form within the plant root.
- Iron-citrate accumulation in the xylem is a key response to iron deficiency in cucumber.
- Chelated iron sources influence iron solubility and uptake efficiency differently compared to natural complexes like iron-citrate.
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