Table 2.
Stem anatomical properties under each combination of water and nitrogen condition
| Nitrogen Conditions | Water Conditions | VF (number mm−2) | VLD (μm) | FLD (μm) | XT (mm) | XCL | PT (mm) |
|---|---|---|---|---|---|---|---|
| Well Watered | Low Nitrogen | 68.8 c±4.6 | 45.4 a ±2.5 | 13.5 b ±0.3 | 0.51 b ±0.02 | 37.9 b ±0.9 | 0.10 b ±0.01 |
| Adequate Nitrogen | 72.9 c ±13.0 | 45.6 a ±2.5 | 15.7 a ±0.3 | 0.77 a ±0.03 | 49.3 a ±2.2 | 0.11 ab ±0.01 | |
| Drought | Low Nitrogen | 97.8 b ±3.9 | 45.2 a ±2.3 | 13.2 b ±0.6 | 0.34 c ±0.03 | 26.1 c ±1.9 | 0.11 ab ±0.01 |
| Adequate Nitrogen | 139.6 a ±9.5 | 39.5 a ±5.5 | 12.7 b ±0.7 | 0.5 b ±0.02 | 39.6 b ±2.3 | 0.12 a ±0.01 | |
| F Value of Two-way ANOVA | Nitrogen (N) | 10.7* | 1.9 | 8.3* | 345.1** | 133.2** | 5.8* |
| Water (W) | 49.6** | 2.4 | 31.9** | 378.8** | 105.6** | 1.4 | |
| N × W | 8.8* | 2.2 | 20.7** | 19.6** | 1.2 | 0.00 |
VF vessel frequency; VLD vessel lumen diameter; FLD fiber lumen diameter; XT xylem thickness; XCL xylem cell layers; PT phloem thickness. Means with different letters are statistically different in multiple comparisons between treatments at the 5% level in ANOVAs. Level of significance of F value in two-way ANOVA is denoted by: *0.05 > p > 0.01, **p < 0.01