Retention of phytosiderophores by the soil solid phase – adsorption and desorption

Walter, Martín; Oburger, Eva; Schindlegger, Yvonne; Puschenreiter, Markus; Kraemer, Stephan M.; Schenkeveld, Walter D. C.

doi:10.1007/s11104-016-2800-x

Cited by 14 publications

(15 citation statements)

References 43 publications

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“…Considering root growth dynamics, and taking into account that PS are mainly exuded from root tips, the significantly slower mineralization of DMA in bulk soil is of high ecological importance to enhance the Fe scavenging efficiency of PS released into the soil [24]. The adsorption and desorption of phytosiderophores by the soil solid phase has also been studied [25].…”

Section: Discussionmentioning

confidence: 99%

Effect of Elemental Sulfur as Fertilizer Ingredient on the Mobilization of Iron from the Iron Pools of a Calcareous Soil Cultivated with Durum Wheat and the Crop’s Iron and Sulfur Nutrition

et al. 2018

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Abstract:The granules of conventional fertilizers have been enriched recently with 2% elemental sulfur (S 0 ) via a binding material of organic nature and such fertilizers are suitable for large scale agriculture. In a previous work, we demonstrated that a durum wheat crop that received the enriched fertilization scheme (FBS 0 -crop) accumulated a higher amount of Fe compared to the durum wheat crop fertilized by the corresponding conventional fertilization scheme (F-crop). In this study, we investigated the effect of S 0 on the contingent mobilization of iron from the iron pools of the calcareous field that affiliated the durum wheat crop and the corresponding effect on the crop's iron nutrition and sulfur nutrition. A sequential extraction of Fe from root zone soil (rhizosoil) was applied and the fluctuations of these fractions during crop development were monitored. The fertilization with FBS 0 at sowing affected the iron fractions of the rhizosoil towards iron mobilization, thus providing more iron to the crop, which apart from the iron nutrition fortified the crop's sulfur nutrition, too. No iron was found as iron attached to carbonates of the rhizosoil. Fluctuations of the iron pool, bound or adsorbed to the organic matter, were exactly the opposite to those of the iron pool associated with the clay particles in both treatments, suggesting iron exchange between the two pools. Replenishment of the F-crop's Fe content and a deficit in the FBS 0 -crop's Fe content in the rhizosoil were found at the end of the cultivation period. Furthermore, the initiation of the fast stem elongation stage (day 125) constituted a turning point. Before day 125, the use of FBS 0 increased the iron concentration in the main stems and this was an early fortification effect, followed by an increase in the organic S concentration. Following day 125, the FBS 0 -crop consisted of plants with higher main stems and less tillers. A late fortification effect was observed in the iron concentration of the main stems and their heads after the stage of complete flowering. Prior to harvesting in the FBS 0 -crop, all plant parts were heavier, with more iron and organic sulfur accumulated in these plant parts, and the obtained commercial yield of the FBS 0 -crop was higher by 27.3%.

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Section: Discussionmentioning

confidence: 99%

Effect of Elemental Sulfur as Fertilizer Ingredient on the Mobilization of Iron from the Iron Pools of a Calcareous Soil Cultivated with Durum Wheat and the Crop’s Iron and Sulfur Nutrition

et al. 2018

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“…The results from the Varying ligand concentration experiment raise the question if synergistic Fe mobilization is in fact possible in Strategy II Fe acquisition: in experiments with wheat plants grown on calcareous soils, phytosiderophore pore water concentrations were in the lower micromolar range [15], while no synergistic Fe mobilization was observed for up to 30 µM DMA due to enhanced Ni and Co mobilization ( Figure 5). However, the total phytosiderophore concentration (solid + solution) might be up to an order of magnitude larger than the pore water concentration as a result of adsorption [42,59]. Also, phytosiderophore concentrations in the rhizosphere are presumably larger than the pore water average [60].…”

Section: Varying Ligand and Reductant Concentrationmentioning

confidence: 99%

“…Because soils are multi-phase systems, they generally will not conform to mechanistic rate laws describing surface-controlled ligand-promoted or reductive dissolution as developed previously for pure iron oxides, e.g., by Banwart et al Instead, for soils we described the rate as a function of applied concentrations: , respectively, and a, b, c and d are the rate orders. For the DMA ligand, overall adsorption to Santomera soil is linearly related to the applied concentration [59]; however, the distribution of the ligand over reactive surfaces in the soil and the role of ligand exchange reactions with natural organic matter (NOM) in relation to metal mobilization remain unspecified. Experimentally observed mobilized metal concentrations after 0.25 h ( Figure 6) were converted into average initial mobilization rates ( Figure 7) by dividing them by 900 s. Rate constants kDMA, kasc and ksyn and rate orders a, b and c were fit to these rates (Rnet; Equation (3)) for the individual metals (Table 1) using the Excel solver.…”

Section: Varying Ligand and Reductant Concentrationmentioning

confidence: 99%

Constraints to Synergistic Fe Mobilization from Calcareous Soil by a Phytosiderophore and a Reductant

Schenkeveld

Kraemer

2018

Soil Systems

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Synergistic effects between ligand- and reductant-based Fe acquisition strategies can enhance the mobilization of Fe, but also of competing metals from soil. For phytosiderophores, this may alter the time and concentration window of Fe uptake during which plants can benefit from elevated Fe concentrations. We examined how the size of this window is affected by the ligand and reductant concentration and by non-simultaneous addition. To this end, a series of kinetic batch experiments was conducted with a calcareous clay soil to which the phytosiderophore 2′-deoxymugineic acid (DMA) and the reductant ascorbate were added at various concentrations, either simultaneously or with a one- or two-day lag time. Both simultaneous and non-simultaneous addition of the reductant and the phytosiderophore induced synergistic Fe mobilization. Furthermore, initial Fe mobilization rates increased with increasing reductant and phytosiderophore concentrations. However, the duration of the synergistic effect and the window of Fe uptake decreased with increasing reductant concentration due to enhanced competitive mobilization of other metals. Rate laws accurately describing synergistic mobilization of Fe and other metals from soil were parameterized. Synergistic Fe mobilization may be vital for the survival of plants and microorganisms in soils of low Fe availability. However, in order to optimally benefit from these synergistic effects, exudation of ligands and reductants in the rhizosphere need to be carefully matched.

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“…Also, adsorption of metal-PS complexes to the soil solid phase lowers their concentration in soil solution. For FeDMA, CuDMA, NiDMA and ZnDMA (0 - 100 μM) and the free DMA ligand (0 - 1000 μM) adsorption to soil proved to be linear and partly reversible (Walter et al 2016 ). Adsorption kinetics were shown to be fast in comparison to metal mobilization kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…Adsorption kinetics were shown to be fast in comparison to metal mobilization kinetics. Among the DMA species examined, NiDMA had the strongest tendency to adsorb and CuDMA the weakest, and adsorption of metal-PS complexes correlated most strongly with the ratio of a clay content over soil organic matter content (Walter et al 2016 ).…”

Section: Introductionmentioning

confidence: 99%

The effect of pH, electrolytes and temperature on the rhizosphere geochemistry of phytosiderophores

2017

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Background and aimsGraminaceous plants are grown worldwide as staple crops under a variety of climatic and soil conditions. They release phytosiderophores for Fe acquisition (Strategy II). Aim of the present study was to uncover how the rhizosphere pH, background electrolyte and temperature affect the mobilization of Fe and other metals from soil by phytosiderophores.MethodsFor this purpose a series of kinetic batch interaction experiments with the phytosiderophore 2′-deoxymugineic acid (DMA), a calcareous clay soil and a mildly acidic sandy soil were performed. The temperature, electrolyte concentration and applied electrolyte cation were varied. The effect of pH was examined by applying two levels of lime and Cu to the acidic soil.ResultsFe mobilization by DMA increased by lime application, and was negatively affected by Cu amendment. Mobilization of Fe and other metals decreased with increasing ionic strength, and was lower for divalent than for monovalent electrolyte cations at equal ionic strength, due to higher adsorption of metal-DMA complexes to the soil. Metal mobilization rates increased with increasing temperature leading to a faster onset of competition; Fe was mobilized faster, but also became depleted faster at higher temperature. Temperature also affected biodegradation rates of metal-DMA complexes.ConclusionRhizosphere pH, electrolyte type and concentration and temperature can have a pronounced effect on Strategy II Fe acquisition by affecting the time and concentration ‘window of Fe uptake’ in which plants can benefit from phytosiderophore-mediated Fe uptake.Electronic supplementary materialThe online version of this article (doi:10.1007/s11104-017-3226-9) contains supplementary material, which is available to authorized users.

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Retention of phytosiderophores by the soil solid phase – adsorption and desorption

Cited by 14 publications

References 43 publications

Effect of Elemental Sulfur as Fertilizer Ingredient on the Mobilization of Iron from the Iron Pools of a Calcareous Soil Cultivated with Durum Wheat and the Crop’s Iron and Sulfur Nutrition

Effect of Elemental Sulfur as Fertilizer Ingredient on the Mobilization of Iron from the Iron Pools of a Calcareous Soil Cultivated with Durum Wheat and the Crop’s Iron and Sulfur Nutrition

Constraints to Synergistic Fe Mobilization from Calcareous Soil by a Phytosiderophore and a Reductant

The effect of pH, electrolytes and temperature on the rhizosphere geochemistry of phytosiderophores

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