Table 4.
Wood anatomy in hybrid poplar stem (LS) after 46 days of treatment with different ozone concentrations
| Treatment | Tension wood |
Opposite wood |
||||||
| Cambium cell layers (number) | Fibre frequency (number mm−2) | Vessel frequency (number mm−2) | Vessel lumen diameter (μm) | Cambium cell layers (number) | Fibre frequency (number mm−2) | Vessel frequency (number mm−2) | Vessel lumen diameter (μm) | |
| Control | 6.4±0.5 | 2890±200 | 173±33 | 40.7±2.8 | 6.2±0.3 | 2970±200 | 200±13 | 49.8±3.1 |
| Ozone, 50 nl l−1 | ND | 3760±510* | 142±25* | 47.4±1.2* | ND | 3120±480 | 179±12 | 49.7±3.6 |
| Ozone, 100 nl l−1 | ND | 4560±730* | 126±35* | 45.1±4.5* | ND | 3340±410 | 220±27 | 49.1±1.3 |
| Ozone, 200 nl l−1 | 3.3±0.4* | 3790±170* | 124±15* | 47.2±2.6* | 3.0±0.5* | 3500±180 | 188±22 | 49.4±0.8 |
| Ozone, 300 nl l−1 | ND | 4050±240* | 105±62* | 47.9±2.1* | ND | 3450±500 | 188±17 | 49.6±2.6 |
Data are mean values ±SD (n=3, individual replicates).
*Significant differences (P <0.05) between control and ozone treatments.
ND, not determined.