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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. 5. — Relationships between stem P₅₀ and thickness of the intervessel pit membrane (T_PM). (A) Linear regression between P₅₀ and T_PM. The adjusted R² and the level of significance are given. Each dot represents one individual (on average two individuals per species). (B–D) Transmission electron microscope images of intervessel pits of Brassicaceae species showing thicker pit membranes (arrows) in species that are more embolism resistant; all the herbaceous Brassicaceae species studied have vestures (asterisks). (B) Raphanus raphanistrum. (C) Rapistrum rugosum. (D) Sisymbrium erysimoides. Scale bars represent 2 μm.