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Quantifying citrate-enhanced phosphate root uptake using microdialysis.

D M McKay Fletcher1, R Shaw2, A R Sánchez-Rodríguez2,3

  • 1Bioengineering Sciences Research Group, Department of Mechanical Engineering, School of Engineering Sciences, Faculty of Engineering and Physical Sciences, University of Southampton, University Road, Southampton, SO17 1BJ UK.

Plant and Soil
|November 1, 2021
PubMed
Summary
This summary is machine-generated.

Plant roots exude organic acids like citrate to improve phosphate (P) availability. This study used microdialysis and modeling to quantify citrate

Keywords:
MethodModellingNutrient uptakePhosphorus mobilisationSoil solution

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Area of Science:

  • Plant Science
  • Soil Science
  • Biogeochemistry

Background:

  • Organic acid exudation by plant roots is a key strategy for enhancing phosphate (P) acquisition in nutrient-limited soils.
  • Citrate is a significant organic acid involved in P solubilization and desorption from soil.
  • Quantifying the impact of root exudates on rhizosphere P dynamics is crucial for understanding plant nutrition.

Purpose of the Study:

  • To develop and validate a combined experimental (microdialysis) and modeling approach to quantify citrate-enhanced P desorption.
  • To assess the importance of citrate-mediated P mobilization for root P uptake.
  • To determine the threshold citrate exudation rate required for significant P absorption enhancement.

Main Methods:

  • Microdialysis probes were deployed in soil and perfused with varying citrate concentrations (0.1, 1.0, 10 mM) to mimic rhizosphere conditions.
  • Experimental data on P recovery from soil were used to quantify rhizosphere P availability.
  • A mathematical model was developed to describe probe P uptake, citrate exudation, P movement, and citrate-P desorption, with parameters fitted to experimental data. This model was then applied to a root system exuding citrate.

Main Results:

  • A citrate exudation rate of 0.73 μmol cm⁻¹ root h⁻¹ is necessary for a significant increase in plant P absorption.
  • Microdialysis probes perfused with citrate demonstrated P absorption comparable to that of an exuding root.
  • Typical root citrate exudation rates (4.3 × 10⁻⁵ μmol m⁻¹ root h⁻¹) did not significantly contribute to P uptake.

Conclusions:

  • Microdialysis, when combined with calibration experiments and mathematical modeling, is a promising technique for investigating rhizosphere processes.
  • The study highlights the specific rates of citrate exudation required to effectively enhance P uptake.
  • Root-exuded citrate at typical rates may have a limited direct impact on P absorption, suggesting other mechanisms or higher exudation rates are needed.