Modelling facilitation or competition within a root system: importance of the overlap of root depletion and accumulation zones
| Autor: | Henri de Parseval, Jacques Gignoux, Sébastien Barot, Jean-Christophe Lata, Xavier Raynaud |
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| Přispěvatelé: | Institut d'écologie et des sciences de l'environnement de Paris (iEES), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Recherche Agronomique (INRA), Institute of Natural Resources, Tomsk Polytechnic University [Russie] (UPT), French Agence Nationale de la Recherche [ANR-07-CIS7-001], Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Institut d'écologie et des sciences de l'environnement de Paris (IEES) |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
media_common.quotation_subject Population Soil Science chemistry.chemical_element Plant Science Root system Biology 01 natural sciences Modelling Competition (biology) Diffusion Nutrient Spatial distribution education media_common Rhizosphere education.field_of_study Phosphorus 04 agricultural and veterinary sciences [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics 15. Life on land chemistry Agronomy Exudation 040103 agronomy & agriculture Facilitation 0401 agriculture forestry and fisheries Unit root [SDE.BE]Environmental Sciences/Biodiversity and Ecology 010606 plant biology & botany |
| Zdroj: | Plant and Soil Plant and Soil, Springer Verlag, 2017, 419 (1-2), pp.1-15. ⟨10.1007/s11104-017-3321-y⟩ Plant and Soil, 2017, 419 (1-2), pp.1-15. ⟨10.1007/s11104-017-3321-y⟩ Plant and Soil, Springer Verlag, 2017, pp.1-15. ⟨10.1007/s11104-017-3321-y⟩ |
| ISSN: | 1573-5036 0032-079X |
| DOI: | 10.1007/s11104-017-3321-y |
| Popis: | International audience; Aims: The concept of intra-plant, inter-root competition considers the overlap of nutrient depletion zones around roots, but neglects the spatial pattern of root exudates that can increase nutrient availability. We tested the hypothesis that interactions between nutrient accumulation zones due to exudation by different roots can lead to intra-plant inter-root facilitation.Methods: We used the PARIS model (Raynaud et al. 2008) to simulate phosphorus uptake by a population of roots that are able to increase phosphorus availability by exuding citrate. We carried out several simulations with the same parameters but with increasing root density in order to study out if changes in root densities would alter nutrient uptake per unit root.Results: Emerging relationships between root uptake efficiency and root length density indicated cases of inter-root competition or facilitation. The sizes of the accumulation and depletion zones were calculated to explain these results. Our simulations showed a continuum between cases of inter-root competition and facilitation. Facilitation occurred at low exudation rates, when phosphorus supply was not saturated within the phosphorus depletion zone surrounding roots. Low exudation systems led to a lower phosphorus uptake per unit root length, but minimized phosphorus losses in the process.Conclusions: Based on our model, we derived conditions that allowed predicting whether competition, facilitation or no interaction, is the dominant interaction between roots within a root system, based on the different distances to which an isolated root alters P concentration and supply. |
| Databáze: | OpenAIRE |
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