Silicon solubilisation from soil minerals and soil by root exudate compounds
Organic root exudate compounds (ORECs) can enhance mineral dissolution, releasing silicon (Si), but OREC-induced processes of Si solubilisation from different soil Si pools are poorly understood. This study explored the impact of two carboxylates (citrate, oxalate) and a phenolate (catechol) on Si s...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Geoderma |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0016706125002137 |
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| author | Mirriam C. Chibesa Dmytro Monoshyn Markus Puschenreiter Alireza Golestanifard Gerlinde Wieshammer Walter W. Wenzel Jakob Santner |
| author_facet | Mirriam C. Chibesa Dmytro Monoshyn Markus Puschenreiter Alireza Golestanifard Gerlinde Wieshammer Walter W. Wenzel Jakob Santner |
| author_sort | Mirriam C. Chibesa |
| collection | DOAJ |
| description | Organic root exudate compounds (ORECs) can enhance mineral dissolution, releasing silicon (Si), but OREC-induced processes of Si solubilisation from different soil Si pools are poorly understood. This study explored the impact of two carboxylates (citrate, oxalate) and a phenolate (catechol) on Si solubilisation from soils and soil minerals. We extracted six different soils, seven primary minerals, and four clay minerals with the three ORECs and NH4NO3 as a background electrolyte (control) at a realistic rhizosphere concentration of 5 mmol L−1. The extraction solutions were not buffered to mimic the conditions of real rhizospheres. Silicon extractability from the experimental soils was positively related to clay content, whereas other soil chemical and mineral characteristics showed no obvious relation. The ORECs extracted up to 11 times more Si than the control from primary minerals, clay minerals and soils during 2-hour extraction periods. Citrate consistently increased Si solubility in soils and soil minerals. Catechol mainly increased Si solubilisation from soil minerals, while oxalate had the greatest effect in soils. Overall, the Si solubilisation efficiency of ORECs varied and followed the order citrate > catechol > oxalate for primary minerals, catechol > citrate > oxalate for clay minerals, and oxalate > citrate > catechol for soils. We conclude that ORECs can strongly enhance Si solubilisation from soils and soil minerals at concentrations as low as observed in plant rhizospheres. These OREC-induced mineral weathering processes contribute to Si dynamics in the rhizosphere and facilitate soil formation. |
| format | Article |
| id | doaj-art-4c7c8d3fc40b4d9cb01bb9444a27a102 |
| institution | Kabale University |
| issn | 1872-6259 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoderma |
| spelling | doaj-art-4c7c8d3fc40b4d9cb01bb9444a27a1022025-08-20T03:30:45ZengElsevierGeoderma1872-62592025-07-0145911737510.1016/j.geoderma.2025.117375Silicon solubilisation from soil minerals and soil by root exudate compoundsMirriam C. Chibesa0Dmytro Monoshyn1Markus Puschenreiter2Alireza Golestanifard3Gerlinde Wieshammer4Walter W. Wenzel5Jakob Santner6University of Natural Resources and Life Sciences, Vienna, Department of Crop Sciences, Institute of Agronomy, Konrad-Lorenz-Strasse 24, 3430 Tulln an der Donau, AustriaUniversity of Natural Resources and Life Sciences, Vienna, Department of Crop Sciences, Institute of Agronomy, Konrad-Lorenz-Strasse 24, 3430 Tulln an der Donau, AustriaUniversity of Natural Resources and Life Sciences, Vienna, Department of Forest- and Soil Sciences, Institute of Soil Research, Konrad-Lorenz-Strasse 24, 3430 Tulln an der Donau, AustriaUniversity of Natural Resources and Life Sciences, Vienna, Department of Forest- and Soil Sciences, Institute of Soil Research, Konrad-Lorenz-Strasse 24, 3430 Tulln an der Donau, AustriaUniversity of Natural Resources and Life Sciences, Vienna, Department of Crop Sciences, Institute of Agronomy, Konrad-Lorenz-Strasse 24, 3430 Tulln an der Donau, AustriaUniversity of Natural Resources and Life Sciences, Vienna, Department of Forest- and Soil Sciences, Institute of Soil Research, Konrad-Lorenz-Strasse 24, 3430 Tulln an der Donau, AustriaUniversity of Natural Resources and Life Sciences, Vienna, Department of Crop Sciences, Institute of Agronomy, Konrad-Lorenz-Strasse 24, 3430 Tulln an der Donau, Austria; Justus Liebig University Giessen, Institute of Plant Nutrition, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany; Corresponding author at: Justus Liebig University Giessen, Institute of Plant Nutrition, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany.Organic root exudate compounds (ORECs) can enhance mineral dissolution, releasing silicon (Si), but OREC-induced processes of Si solubilisation from different soil Si pools are poorly understood. This study explored the impact of two carboxylates (citrate, oxalate) and a phenolate (catechol) on Si solubilisation from soils and soil minerals. We extracted six different soils, seven primary minerals, and four clay minerals with the three ORECs and NH4NO3 as a background electrolyte (control) at a realistic rhizosphere concentration of 5 mmol L−1. The extraction solutions were not buffered to mimic the conditions of real rhizospheres. Silicon extractability from the experimental soils was positively related to clay content, whereas other soil chemical and mineral characteristics showed no obvious relation. The ORECs extracted up to 11 times more Si than the control from primary minerals, clay minerals and soils during 2-hour extraction periods. Citrate consistently increased Si solubility in soils and soil minerals. Catechol mainly increased Si solubilisation from soil minerals, while oxalate had the greatest effect in soils. Overall, the Si solubilisation efficiency of ORECs varied and followed the order citrate > catechol > oxalate for primary minerals, catechol > citrate > oxalate for clay minerals, and oxalate > citrate > catechol for soils. We conclude that ORECs can strongly enhance Si solubilisation from soils and soil minerals at concentrations as low as observed in plant rhizospheres. These OREC-induced mineral weathering processes contribute to Si dynamics in the rhizosphere and facilitate soil formation.http://www.sciencedirect.com/science/article/pii/S0016706125002137CatecholCitrateOxalateSiliconSoil mineralsSolubilisation mechanisms |
| spellingShingle | Mirriam C. Chibesa Dmytro Monoshyn Markus Puschenreiter Alireza Golestanifard Gerlinde Wieshammer Walter W. Wenzel Jakob Santner Silicon solubilisation from soil minerals and soil by root exudate compounds Geoderma Catechol Citrate Oxalate Silicon Soil minerals Solubilisation mechanisms |
| title | Silicon solubilisation from soil minerals and soil by root exudate compounds |
| title_full | Silicon solubilisation from soil minerals and soil by root exudate compounds |
| title_fullStr | Silicon solubilisation from soil minerals and soil by root exudate compounds |
| title_full_unstemmed | Silicon solubilisation from soil minerals and soil by root exudate compounds |
| title_short | Silicon solubilisation from soil minerals and soil by root exudate compounds |
| title_sort | silicon solubilisation from soil minerals and soil by root exudate compounds |
| topic | Catechol Citrate Oxalate Silicon Soil minerals Solubilisation mechanisms |
| url | http://www.sciencedirect.com/science/article/pii/S0016706125002137 |
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