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Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures
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Aims A simulation model to demonstrate that soil water potential can regulate transpiration, by influencing leaf water potential and/or inducing root production of chemical signals that are transported to the leaves. Methods Signalling impacts on the relationship between soil water potential and transpiration were simulated by coupling a 3D model for water flow in soil, into and through roots (Javaux et al. 2008) with a model for xylem transport of chemicals (produced as a function of local root water potential). Stomatal conductance was regulated by simulated leaf water potential (H) and/or foliar chemical signal concentrations (C; H+C). Split-root experiments were simulated by varying transpiration demands and irrigation placement. Results While regulation of stomatal conductance by chemical transport was unstable and oscillatory, simulated transpiration over time and root water uptake from the two soil compartments were similar for both H and H+C regulation. Increased stomatal sensitivity more strongly decreased transpiration, and decreased threshold root water potential (below which a chemical signal is produced) delayed transpiration reduction. Conclusions Although simulations with H+C regulation qualitatively reproduced transpiration of plants exposed to partial rootzone drying (PRD), long-term effects seemed negligible.Moreover, most transpiration responses to PRD could be explained by hydraulic signalling alone.
Document type | Article de périodique (Journal article) – Article de recherche |
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Access type | Accès restreint |
Publication date | 2014 |
Language | Anglais |
Journal information | "Plant and Soil : international journal on plant-soil relationships" - Vol. 384, no.1-2, p. 93-112 (2014) |
Peer reviewed | yes |
Publisher | Springer Netherlands (Dordrecht) |
issn | 0032-079X |
e-issn | 1573-5036 |
Publication status | Publié |
Affiliation | UCL - SST/ELI/ELIE - Environmental Sciences |
Keywords | Ecohydrology ; soil-plant relation ; root water uptake ; rootzone water distribution ; Soil-root modelling ; 3668 |
Links |
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Bibliographic reference | Huber, Katrin ; Vanderborght, Jan ; Javaux, Mathieu ; Schröder, Natalie ; Dodd, Ian C. ; et. al. Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures. In: Plant and Soil : international journal on plant-soil relationships, Vol. 384, no.1-2, p. 93-112 (2014) |
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Permanent URL | http://hdl.handle.net/2078.1/152139 |