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. 2018 Dec 24;124(1):1–14. doi: 10.1093/aob/mcy233

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© The Author(s) 2018. Published by Oxford University Press on behalf of the Annals of Botany Company.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 4. — Relationships between stem P₅₀ and the proportion of lignified area per total stem area (P_LIG). (A) Linear regression between P₅₀ and P_LIG. The adjusted R² and the level of significance are given. Each dot represents one individual (on average three individuals per species). (B–E) Light microscope images of cross-sections through the stem of Brassicaceae species showing an increase of P_LIG matching with an increase in embolism resistance. (B) Raphanus raphanistrum. (C) Sinapis alba. (D) Rapistrum rugosum. (E) Sisymbrium orientale from the drier sampling site. The scale bars represent 500 μm.