Table 1.
Anatomical characteristics of the abaxial leaf surface of the five Ulmus species.
| Parameters | U. davidiana var. japonica | U. parvifolia | U. macrocarpa | U. laciniata | U. pumila |
|---|---|---|---|---|---|
| Stomatal length (μm) | 21.3 ± 1.7 c | 26.0 ± 1.2 b | 18.8 ± 1.4 d | 26.8 ± 2.6 ab | 30.0 ± 1.1 a |
| Stomatal width (μm) | 16.9 ± 0.9 d | 19.3 ± 1.1 c | 14.4 ± 1.5 e | 21.2 ± 1.4 b | 25.7 ± 1.2 a |
| Stomatal index (%) | 11.4 ± 0.2 d | 13.5 ± 0.1 b | 18.8 ± 0.1 a | 12.5 ± 0.1 c | 19.2 ± 0.2 a |
| Frequency of stomata | 34.4 ± 5.1 a | 18.1 ± 0.7 b | 29.0 ± 2.2 a | 16.8 ± 0.9 c | 11.0 ± 0.8 d |
Data are expressed as mean ± SD (n > 3) of five independent experiments. Different upper letters in the same line indicate a significant difference (p < 0.05) among samples. A range of 200 μm × 200 μm was selected to count stomatal index and frequency of stomata.