TR32-Database: Database of Transregio 32

[933] - Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures

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Features
Citation
Huber, K., Vanderborght, J., Javaux, M., Schröder, N., Dodd, I., Vereecken, H., 2014. Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures. Plant and Soil, 1 - 20. DOI: 10.1007/s11104-014-2188-4.
Identification
Title(s):Main Title: Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures
Description(s):Abstract: 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 (Figure 8). Moreover, most transpiration responses to PRD could be explained by hydraulic signalling alone.
Identifier(s):DOI: 10.1007/s11104-014-2188-4
Citation Advice:Huber, K., et al. (2014). "Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures." Plant and Soil: 1-20.
Responsible Party
Creator(s):Author: Katrin Huber
Author: Jan Vanderborght
Author: Mathieu Javaux
Author: Natalie Schröder
Author: Ian Dodd
Author: Harry Vereecken
Publisher:Springer International Publisher
Topic
TR32 Topic:Vegetation
Subject(s):CRC/TR32 Keywords: RWU, Modelling, Stomatal Conductance
Topic Category:Enviroment
File Details
File Name:2014_Huber_PlantSoil.pdf
Data Type:Text
File Size:1979 kB (1.933 MB)
Date(s):Date Accepted: 2014-06-24
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:Free
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Geographic
North:-no map data
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Measurement Region:None
Measurement Location:--None--
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2014
Type:Article
Article Type:Journal
Source:Plant and Soil
Number Of Pages:20
Page Range:1 - 20
Metadata Details
Metadata Creator:Katrin Huber
Metadata Created:2014-07-11
Metadata Last Updated:2014-07-11
Subproject:B4
Funding Phase:2
Metadata Language:English
Metadata Version:V40
Dataset Metrics
Page Visits:124
Metadata Downloads:0
Dataset Downloads:9
Dataset Activity
Features