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@ARTICLE{Huber:154373,
author = {Huber, Katrin and Vanderborght, Jan and Javaux, Mathieu and
Schröder, Natalie and Dodd, Ian C. and Vereecken, Harry},
title = {{M}odelling the impact of heterogeneous rootzone water
distribution on the regulation of transpiration by hormone
transport and/or hydraulic pressures},
journal = {Plant and soil},
volume = {384},
number = {1-2},
issn = {1573-5036},
address = {Dordrecht [u.a.]},
publisher = {Springer Science + Business Media B.V},
reportid = {FZJ-2014-03721},
pages = {93-112},
year = {2014},
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. Moreover, most
transpiration responses to PRD could be explained by
hydraulic signalling alone.},
cin = {IBG-3},
ddc = {570},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {246 - Modelling and Monitoring Terrestrial Systems: Methods
and Technologies (POF2-246) / 255 - Terrestrial Systems:
From Observation to Prediction (POF3-255)},
pid = {G:(DE-HGF)POF2-246 / G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000344336200008},
doi = {10.1007/s11104-014-2188-4},
url = {https://juser.fz-juelich.de/record/154373},
}