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@ARTICLE{Zarebanadkouki:820930,
author = {Zarebanadkouki, Mohsen and Meunier, Félicien and Couvreur,
Valentin and Cesar, Jimenez and Javaux, Mathieu and
Carminati, Andrea},
title = {{E}stimation of the hydraulic conductivities of lupine
roots by inverse modelling of high-resolution measurements
of root water uptake},
journal = {Annals of botany},
volume = {118},
number = {4},
issn = {1095-8290},
address = {Oxford},
publisher = {Oxford University Press},
reportid = {FZJ-2016-06194},
pages = {853 - 864},
year = {2016},
abstract = {Background and Aims Radial and axial hydraulic
conductivities are key parameters for proper understanding
and modelling of root water uptake. Despite their
importance, there is limited experimental information on how
the radial and axial hydraulic conductivities vary along
roots growing in soil. Here, a new approach was introduced
to estimate inversely the profile of hydraulic
conductivities along the roots of transpiring plants growing
in soil.Methods A three-dimensional model of root water
uptake was used to reproduce the measured profile of root
water uptake along roots of lupine plant grown in soil. The
profile of fluxes was measured using a neutron radiography
technique combined with injection of deuterated water as
tracer. The aim was to estimate inversely the profiles of
the radial and axial hydraulic conductivities along the
roots.Key Results The profile of hydraulic conductivities
along the taproot and the lateral roots of lupines was
calculated using three flexible scenarios. For all
scenarios, it was found that the radial hydraulic
conductivity increases towards the root tips, while the
axial conductivity decreases. Additionally, it was found
that in soil with uniform water content: (1) lateral roots
were the main location of root water uptake; (2) water
uptake by laterals decreased towards the root tips due to
the dissipation of water potential along the root; and (3)
water uptake by the taproot was higher in the distal
segments and was negligible in the proximal parts, which had
a low radial conductivity.Conclusions The proposed approach
allows the estimation of the root hydraulic properties of
plants growing in soil. This information can be used in an
advanced model of water uptake to predict the water uptake
of different root types or different root architectures
under varying soil conditions.},
cin = {IBG-3},
ddc = {580},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000386487600025},
pubmed = {pmid:27539602},
doi = {10.1093/aob/mcw154},
url = {https://juser.fz-juelich.de/record/820930},
}