Related Experiment Video
Updated: Jun 12, 2026
11:09
A Simple Protocol for Mapping the Plant Root System Architecture Traits
Published on: February 10, 2023
A mechanistic model for understanding root-induced chemical changes controlling phosphorus availability
Nicolas Devau1, Edith Le Cadre, Philippe Hinsinger
1INRA, UMR 1222 Eco & Sols-Ecologie Fonctionnelle & Biogéochimie des Sols (INRA-IRD-SupAgro), Place Viala, F-34060 Montpellier, France.
Annals of Botany
|May 25, 2010
Summary
Plant nutrition models underestimate phosphorus (P) uptake in low-P soils. This study shows calcium (Ca) uptake by durum wheat significantly increases P availability by altering soil chemistry in the rhizosphere.
Area of Science:
- Soil Science
- Plant Nutrition
- Biogeochemistry
Background:
- Current plant nutrition models inadequately represent root-induced chemical changes in the rhizosphere, such as pH shifts.
- These models underestimate phosphorus (P) bioavailability and uptake in phosphorus-limited soils.
Purpose of the Study:
- To simulate root-induced chemical mechanisms governing P nutrition in a P-deficient soil.
- To investigate the role of calcium (Ca) uptake in modulating P availability for durum wheat.
Main Methods:
- Utilized a mechanistic model (1pK-Triple Plane Model, ion-exchange, Nica-Donnan) to simulate cation and anion adsorption by soil constituents.
- Simulated root-induced changes in P and Ca availability in soil, validated against water and CaCl2 extractions.
Main Results:
- Simulations closely matched experimental data, including measured P and Ca uptake and root-induced alkalization.
- Calcium uptake was found to significantly enhance P availability by reducing the promoting effect of Ca adsorption on P adsorption.
- Phosphorus adsorption occurred primarily on Fe oxides and clay minerals (kaolinite, illite), with goethite and kaolinite being the main P sources for durum wheat.
Conclusions:
- Validated a modeling approach for P availability, highlighting the importance of root-induced chemical processes.
- Identified Ca uptake as a novel, critical factor controlling P nutrition in P-deficient soils under experimental conditions.
Related Concept Videos
01:21The Phosphorus Cycle
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
02:34Water and Mineral Acquisition
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
02:35Key Elements for Plant Nutrition
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the atmosphere, the...
01:14Pharmacokinetic–Pharmacodynamic Relationship: Model Components
Pharmacokinetic-pharmacodynamic (PK–PD) modeling is essential in drug development and clinical pharmacology. It provides a quantitative framework to predict drug behavior and response over time. This approach integrates pharmacokinetics (PK), which describes the drug's absorption, distribution, metabolism, and excretion, with pharmacodynamics (PD), which characterizes the drug’s biological effects and mechanisms of action.The disposition kinetics of a drug determine its plasma...
01:09Microbe-Plant Interactions
Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...
01:02Phosphorylation
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...