Spatial distribution of rhizodeposits provides built-in water potential gradient in the rhizosphere

Ghezzehei, Teamrat A.; Albalasmeh, Ammar

doi:10.1016/j.ecolmodel.2014.10.028

Cited by 38 publications

(30 citation statements)

References 47 publications

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“…Boxplots represent the third quartile, the median, the first quartile range of the data, and data outliers. aggregated layer around the roots which remains physically stable (Ghezzehei and Albalasmeh, 2015). This process enhances the residence time of OC in the soil, which may contribute to OC sequestration (Rasse et al, 2005;Schmidt et al, 2011).…”

Section: Binding Agents At the Root Surfacementioning

confidence: 99%

Linking 3D Soil Structure and Plant-Microbe-Soil Carbon Transfer in the Rhizosphere

Vidal

Hirte

Bender

et al. 2018

Front. Environ. Sci.

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Plant roots are major transmitters of atmospheric carbon into soil. The rhizosphere, the soil volume around living roots influenced by root activities, represents hotspots for organic carbon (OC) inputs, microbial activity, and carbon turnover. Rhizosphere processes remain poorly understood and the observation of key mechanisms for carbon transfer and protection in intact rhizosphere microenvironments are challenging. We deciphered the fate of photosynthesis-derived OC in intact wheat rhizosphere, combining stable isotope labeling at field scale with high-resolution 3D-imaging. We used nano-scale secondary ion mass spectrometry and focus ion beam-scanning electron microscopy to generate insights into rhizosphere processes at nanometer scale. In immature wheat roots, the carbon circulated through the apoplastic pathway, via cell walls, from the stele to the cortex. The carbon was transferred to substantial microbial communuties, mainly represented by bacteria surrounding peripheral root cells. Iron oxides formed bridges between roots and bigger mineral particles, such as quartz, and surrounded bacteria in microaggregates close to the root surface. Some microaggregates were also intimately associated with the fungal hyphae surface. Based on these results, we propose a conceptual model depicting the fate of carbon at biogeochemical interfaces in the rhizosphere, at the forefront of growing roots. We observed complex interplays between vectors (roots, fungi, bacteria), transferring plant-derived OC into root-free soil and stabilizing agents (iron oxides, root and microorganism products), potentially protecting plant-derived OC within microaggregates in the rhizosphere.

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Section: Binding Agents At the Root Surfacementioning

confidence: 99%

Linking 3D Soil Structure and Plant-Microbe-Soil Carbon Transfer in the Rhizosphere

Vidal

Hirte

Bender

et al. 2018

Front. Environ. Sci.

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“…They find that indicators of N richness are the strongest predictors of high N gas fluxes at the ecosystem scale, while the distal factors that influence the proximal controls show marked temporal and spatial variation, suggesting that higher resolution and/or more dynamic data are needed to improve the accuracy of landscape and regional scale assessments. Ghezzehei and Albalasmeh (2015) combine a single root model with experiments using synthetic analog of rhizodeposits and environmental scanning electron microscopy to mechanistically reveal how root exudation enhances water retention and uptake. Their model simulations also demonstrate the benefit of variable distribution of root exudates, especially when the potential water uptake rate is high or the rhizodeposits are constrained to a narrow volume of rhizosphere soil.…”

Section: Introductionmentioning

confidence: 99%

Complexity of soils and hydrology in ecosystems

Lin

Vogel

Phillips

et al. 2015

Ecological Modelling

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“…The key scientific unknown is how these phases interact in the soil pore space and how they quantitatively and qualitatively influence soil processes such as plant nutrient and water uptake, mineralisation/mobilisation of nutrients, and feedback processes including release of substances, growth and tissue differentiation. A model of root water uptake including mucilage dynamics in the rhizosphere has been recently introduced in a series of articles by Carminati (2012);Carminati et al (2010); Ghezzehei and Albalasmeh (2015); Kroener et al (2014). In these modelling studies, the rhizosphere hydraulic properties differ from those of the bulk soil and vary over time during drying and wetting cycles.…”

Section: Modelling Rhizosphere Processes: State Of the Artmentioning

confidence: 99%

Challenges in imaging and predictive modeling of rhizosphere processes

et al. 2016

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Background Plant-soil interaction is central to human food production and ecosystem function. Thus, it is essential to not only understand, but also to develop predictive mathematical models which can be used to assess how climate and soil management practices will affect these interactions. Scope In this paper we review the current developments in structural and chemical imaging of rhizosphere processes within the context of multiscale mathematical image based modeling. We outline areas that need more research and areas which would benefit from more detailed understanding. Conclusions We conclude that the combination of structural and chemical imaging with modeling is an incredibly powerful tool which is fundamental for understanding how plant roots interact with soil. We emphasize the need for more researchers to be attracted to this area that is so fertile for future discoveries. Finally, model building must go hand in hand with experiments. In particular, there is a real need to integrate rhizosphere structural and chemical imaging with modeling for better understanding of the rhizosphere processes leading to models which explicitly account for pore scale processes.

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Spatial distribution of rhizodeposits provides built-in water potential gradient in the rhizosphere

Cited by 38 publications

References 47 publications

Linking 3D Soil Structure and Plant-Microbe-Soil Carbon Transfer in the Rhizosphere

Linking 3D Soil Structure and Plant-Microbe-Soil Carbon Transfer in the Rhizosphere

Complexity of soils and hydrology in ecosystems

Challenges in imaging and predictive modeling of rhizosphere processes

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