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. 2013 Jul 5;4:240. doi: 10.3389/fpls.2013.00240

Table 1.

The total number of phloem cells, the total number of xylem cells, and the ratio of phloem cell number to xylem cell number per minor loading (third- and fourth-order) vein in leaves of the Italian, Col-0, and Swedish ecotypes of A. thaliana grown under four different temperature and PFD regimes.

Ecotype Vascular metric Leaf temperature and PFD in μmol photons m−2 s−1 during growth
25°C, 400 25°C, 1000 14°C, 400 14°C, 1000
Italian No. of phloem cells 34 ± 1b 36 ± 2a, b 36 ± 1a, b 40 ± 2a
No. of xylem cells 13 ± 1 n.s. 12 ± 1 12 ± 1 12 ± 1
phloem/xylem 2.6 3 3 3.3
Col-0 No. of phloem cells 32 ± 1b 33 ± 1b 38 ± 3b 49 ± 2a
No. of xylem cells 13 ± 1 n.s. 10 ± 1 10 ± 1 13 ± 1
phloem/xylem 2.5 3.3 3.8 3.8
Swedish No. of phloem cells 35 ± 1b 36 ± 1b 47 ± 1a 53 ± 2a
No. of xylem cells 13 ± 1 n.s. 15 ± 1 13 ± 1 15 ± 1
phloem/xylem 2.7 2.4 3.6 3.5

Means ± standard error of the mean (n = 4) and statistically significant differences indicated with lower case letters, i.e., means sharing a common letter are not statistically different from one another, P < 0.05, n.s., not significantly different. Statistics conducted independently for number of phloem and xylem cells per vein within each ecotype, i.e., comparisons conducted horizontally in the table.