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Table 2 Stem anatomical properties under each combination of water and nitrogen condition

From: The influence of nitrogen availability on anatomical and physiological responses of Populus alba × P. glandulosa to drought stress

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
  1. 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