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. 2016 Sep 23;16:206. doi: 10.1186/s12870-016-0892-3

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — Model of kinetic parameters for P uptake of P deficient poplars at different P concentrations. P uptake rate per gram of fine root mass of plants grown with different P concentrations in the nutrient solution (black squares: HP, 641 μM; open circles: MP, 6.4 μM; grey triangles: LP, 0.064 μM) during exposure to different P concentrations. Data points from six different plants per treatment. Modeled curves (HP: black, MP: dark grey, LP: light grey) with parameters from Table 2 and 95 %-prediction interval in grey. The insert shows an enlargement of the curves at intermediate and low P concentrations around the concentration of C_min