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The number of (A) xylem cells per minor vein, (B) phloem cells per minor vein, and (C) ratio of xylem to phloem cells 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 errors; n = 4. The asterisks denote significant differences between the mean values; ∗∗P < 0.01, ∗∗∗P < 0.001.
