| Rootstock plant age | |||||
|
| 1-year-old | 3-year-old | |||
| Needles anatomical characteristics | |||||
| Mesophyll width (µm) | 181.3 ± 20.7 (a) | 76.6 ± 7.6 (b) | |||
| Epidermis width (µm) | 18.6 ± 1.9 (a) | 16.2 ± 2.3 (b) | |||
| Hypodermis width (µm) | 0.03 ± 0.04 (b) | 15.7 ± 1.9 (a) | |||
| % Vascular cylinder | 14.5 ± 0.5 (b) | 41.6 ± 0.4 (a) | |||
| Resin canal (µm2) | 2013.0 ± 235,4 (b) | 2741.7 ± 763.6 (a) | |||
| Stems anatomical characteristics | |||||
| Total diameter (µm) | 2355.6 ± 209.2 (b) | 3717.5 ± 170.7 (a) | |||
| Xylem diameter (µm) | 461.7 ± 74.2 (b) | 811.4 ± 13.4 (a) | |||
| Phloem diameter (µm) | 119.6 ± 10.2 (a) | 149.1 ± 12.0 (a) | |||
| Periderm width (µm) | 81.5 ± 8.5 (b) | 117.5 ± 1.3 (a) | |||
| Rooting capability | |||||
| % of rooting | 96.66 ± 1.44 (a) | 18.81 ± 0.98 (b) | |||