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. 2018 Jun 1;9:693. doi: 10.3389/fpls.2018.00693

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Copyright © 2018 Stewart, Polutchko, Demmig-Adams and Adams.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The number of (A) tracheary elements per minor vein, (B) sieve elements per minor vein, (C) companion cells (CCs) plus phloem parenchyma cells (PCs) per minor vein, and (D) ratio of tracheary to sieve elements in minor veins of the Col-0 (violet columns) and low-vein-density Ei-5 (indigo columns) accessions of A. thaliana grown under a 9-h photoperiod of 1000 μmol photons m^-2 s^-1 at a leaf temperature of 20°C. Mean values ± standard error, n = 4. The asterisks denote significant differences between the mean values; ^∗∗P < 0.01, ^∗∗∗P < 0.001.