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Binding of transition metals to monosilicic acid in aqueous and xylem (Cucumis sativus L.) solutions: a low-T electron paramagnetic resonance study

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2016
Authors
Stević, Nenad
Korać Jačić, Jelena
Pavlović, Jelena
Nikolic, Miroslav
Article (Published version)
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Abstract
The supplementation of monosilicic acid [Si(OH)(4)] to the root growing medium is known to protect plants from toxic levels of iron (Fe), copper (Cu) and manganese (Mn), but also to mitigate deficiency of Fe and Mn. However, the physicochemical bases of these alleviating mechanisms are not fully understood. Here we applied low-T electron paramagnetic resonance (EPR) spectroscopy to examine the formation of complexes of Si(OH)(4) with Mn2+, Fe3+, and Cu2+ in water and in xylem sap of cucumber (Cucumis sativus L.) grown without or with supply of Si(OH)(4). EPR, which is also useful in establishing the redox state of these metals, was combined with measurements of total concentrations of metals in xylem sap by inductive coupled plasma. Our results show that Si(OH)(4) forms coordination bonds with all three metals. The strongest interactions of Si(OH)(4) appear to be with Cu2+ (1/1 stoichiometry) which might lead to Cu precipitation. In line with this in vitro findings, Si(OH)(4) supply to... cucumber resulted in dramatically lower concentration of this metal in the xylem sap. Further, it was demonstrated that Si(OH)(4) supplementation causes pro-reductive changes that contribute to the maintenance of Fe and, in particular, Mn in the xylem sap in bioavailable 2+ form. Our results shed more light on the intertwined reactions between Si(OH)(4) and transition metals in plant fluids (e.g. xylem sap).

Keywords:
Xylem sap / Transition metals / Monosilicic acid / EPR / Cucumius sativus L
Source:
Biometals, 2016, 29, 5, 945-951
Publisher:
  • Springer, Dordrecht
Funding / projects:
  • Mineral Stress and Plant Adaptations to Marginal Agricultural Soils (RS-173028)
  • Biomarkers in neurodegenerative and malignant processes (RS-41005)

DOI: 10.1007/s10534-016-9966-9

ISSN: 0966-0844

PubMed: 27502949

WoS: 000385252400017

Scopus: 2-s2.0-84981163477
[ Google Scholar ]
9
4
URI
http://rimsi.imsi.bg.ac.rs/handle/123456789/1008
Collections
  • Radovi istraživača / Researchers’ publications
Institution/Community
Institut za multidisciplinarna istraživanja
TY  - JOUR
AU  - Stević, Nenad
AU  - Korać Jačić, Jelena
AU  - Pavlović, Jelena
AU  - Nikolic, Miroslav
PY  - 2016
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/1008
AB  - The supplementation of monosilicic acid [Si(OH)(4)] to the root growing medium is known to protect plants from toxic levels of iron (Fe), copper (Cu) and manganese (Mn), but also to mitigate deficiency of Fe and Mn. However, the physicochemical bases of these alleviating mechanisms are not fully understood. Here we applied low-T electron paramagnetic resonance (EPR) spectroscopy to examine the formation of complexes of Si(OH)(4) with Mn2+, Fe3+, and Cu2+ in water and in xylem sap of cucumber (Cucumis sativus L.) grown without or with supply of Si(OH)(4). EPR, which is also useful in establishing the redox state of these metals, was combined with measurements of total concentrations of metals in xylem sap by inductive coupled plasma. Our results show that Si(OH)(4) forms coordination bonds with all three metals. The strongest interactions of Si(OH)(4) appear to be with Cu2+ (1/1 stoichiometry) which might lead to Cu precipitation. In line with this in vitro findings, Si(OH)(4) supply to cucumber resulted in dramatically lower concentration of this metal in the xylem sap. Further, it was demonstrated that Si(OH)(4) supplementation causes pro-reductive changes that contribute to the maintenance of Fe and, in particular, Mn in the xylem sap in bioavailable 2+ form. Our results shed more light on the intertwined reactions between Si(OH)(4) and transition metals in plant fluids (e.g. xylem sap).
PB  - Springer, Dordrecht
T2  - Biometals
T1  - Binding of transition metals to monosilicic acid in aqueous and xylem (Cucumis sativus L.) solutions: a low-T electron paramagnetic resonance study
EP  - 951
IS  - 5
SP  - 945
VL  - 29
DO  - 10.1007/s10534-016-9966-9
ER  - 
@article{
author = "Stević, Nenad and Korać Jačić, Jelena and Pavlović, Jelena and Nikolic, Miroslav",
year = "2016",
abstract = "The supplementation of monosilicic acid [Si(OH)(4)] to the root growing medium is known to protect plants from toxic levels of iron (Fe), copper (Cu) and manganese (Mn), but also to mitigate deficiency of Fe and Mn. However, the physicochemical bases of these alleviating mechanisms are not fully understood. Here we applied low-T electron paramagnetic resonance (EPR) spectroscopy to examine the formation of complexes of Si(OH)(4) with Mn2+, Fe3+, and Cu2+ in water and in xylem sap of cucumber (Cucumis sativus L.) grown without or with supply of Si(OH)(4). EPR, which is also useful in establishing the redox state of these metals, was combined with measurements of total concentrations of metals in xylem sap by inductive coupled plasma. Our results show that Si(OH)(4) forms coordination bonds with all three metals. The strongest interactions of Si(OH)(4) appear to be with Cu2+ (1/1 stoichiometry) which might lead to Cu precipitation. In line with this in vitro findings, Si(OH)(4) supply to cucumber resulted in dramatically lower concentration of this metal in the xylem sap. Further, it was demonstrated that Si(OH)(4) supplementation causes pro-reductive changes that contribute to the maintenance of Fe and, in particular, Mn in the xylem sap in bioavailable 2+ form. Our results shed more light on the intertwined reactions between Si(OH)(4) and transition metals in plant fluids (e.g. xylem sap).",
publisher = "Springer, Dordrecht",
journal = "Biometals",
title = "Binding of transition metals to monosilicic acid in aqueous and xylem (Cucumis sativus L.) solutions: a low-T electron paramagnetic resonance study",
pages = "951-945",
number = "5",
volume = "29",
doi = "10.1007/s10534-016-9966-9"
}
Stević, N., Korać Jačić, J., Pavlović, J.,& Nikolic, M.. (2016). Binding of transition metals to monosilicic acid in aqueous and xylem (Cucumis sativus L.) solutions: a low-T electron paramagnetic resonance study. in Biometals
Springer, Dordrecht., 29(5), 945-951.
https://doi.org/10.1007/s10534-016-9966-9
Stević N, Korać Jačić J, Pavlović J, Nikolic M. Binding of transition metals to monosilicic acid in aqueous and xylem (Cucumis sativus L.) solutions: a low-T electron paramagnetic resonance study. in Biometals. 2016;29(5):945-951.
doi:10.1007/s10534-016-9966-9 .
Stević, Nenad, Korać Jačić, Jelena, Pavlović, Jelena, Nikolic, Miroslav, "Binding of transition metals to monosilicic acid in aqueous and xylem (Cucumis sativus L.) solutions: a low-T electron paramagnetic resonance study" in Biometals, 29, no. 5 (2016):945-951,
https://doi.org/10.1007/s10534-016-9966-9 . .

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