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

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*Title:*	Main Title: Modelling the impact of heterogeneous rootzone water distribution on the regulation of transpiration by hormone transport and/or hydraulic pressures
*Description:*	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:*	10.1007/s11104-014-2188-4 (DOI)
*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

*Creators:*	Katrin Huber (Author), Jan Vanderborght (Author), Mathieu Javaux (Author), Natalie Schröder (Author), Ian Dodd (Author), Harry Vereecken (Author)
*Publisher:*	Springer International Publisher
*Publication Year:*	2014

Topic

*TR32 Topic:*	Vegetation
*Related Subproject:*	B4
*Subjects:*	Keywords: RWU, Modelling, Stomatal Conductance
*Geogr. Information Topic:*	Environment

File Details

*Filename:*	2014_Huber_PlantSoil.pdf
*Data Type:*	Text - Article
*File Size:*	1.9 MB
*Date:*	Accepted: 24.06.2014
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	Completed

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*Download Permission:*	Free
*General Access and Use Conditions:*	According to the TR32DB data policy agreement.
*Access Limitations:*	According to the TR32DB data policy agreement.
*Licence:*	[TR32DB] Data policy agreement

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Specific Information - Publication

*Publication Status:*	Published
*Review Status:*	Peer reviewed
*Publication Type:*	Article
*Article Type:*	Journal
*Source:*	Plant and Soil
*Source Website:*	http://www.springer.com/life+sciences/plant+sciences/journal/11104
*Number of Pages:*	20 (1 - 20)

Metadata Details

*Metadata Creator:*	Katrin Huber
*Metadata Created:*	11.07.2014
*Metadata Last Updated:*	11.07.2014
*Subproject:*	B4
*Funding Phase:*	2
*Metadata Language:*	English
*Metadata Version:*	V50

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