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. 2019 Sep 10;9:12979. doi: 10.1038/s41598-019-49528-9

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Light transmission microscopy of a cross-section of the taproot of a twelve-days old lupin at a distance of 5 cm from the soil surface. (b) Neutron tomograms showing a cross-section of the taproot. The color is proportional to the water content. (c) Radially symmetric root schematization. (d) The fraction of the root tissue used to set-up the model with one apoplastic pathway indicated in blue. (e) Schematic of the flow domain across the root tissue. (f) Discretization of the flow domain into 2000 finite elements.