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. 2020 Jan 22;82(2):17. doi: 10.1007/s11538-019-00685-y

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 11 — Influence of tissue growth on PIN polarisation contributes to the formation of ‘reverse-fountain’ auxin distribution patterns at the root tip. Numerical solution of model (1)–(4b) on a modified domain and different combinations of source and sink cells. a The central four cells in the top row are source cells, auxin flows from these cells to the base of the tissue with no flow from the base cells back up the tissue. b The outer four cells in the top row are sink cells, auxin flows from cells in the top five rows into these sinks, in the bottom three rows of cells auxin flows to the base of the tissue. c The central four cells in the top row are source cells and the outer four cells in the top row are sink cells, auxin flows from the source cells down the tissue, the central columns flow to the base of the tissue and the outer columns divert outwards to flow back up to the sink cells, resembling the reverse-fountain pattern observed at the root tip. Model parameters are described in Appendix Tables 2 and 3, with zero-flux boundary conditions. Cells are represented in the reference configuration (Color figure online)