Table 3.
Broad-sense heritabilities (± s.e.) on an individual basis (H2) for stomatal traits (adaxial, abaxial and total stomatal densities, adaxial and abaxial stomatal lengths, and ratio adaxial : abaxial densities) and carbon isotope discrimination (Δ) of the selected F1 genotypes of the D × N and the D × T families (both 50 F1)
| D × N family* | D × T family* | |
|---|---|---|
| Stomatal traits | ||
| Adaxial density (mm−2) | 0·53 ± 0·07 | 0·49 ± 0·07 |
| Abaxial density (mm−2) | 0·28 ± 0·07 | 0·62 ± 0·06 |
| Total density (mm−2) | 0·37 ± 0·07 | 0·59 ± 0·06 |
| Ratio | 0·50 ± 0·07 | 0·37 ± 0·07 |
| Adaxial length (μm) | 0·46 ± 0·07 | 0·77 ± 0·04 |
| Abaxial length (μm) | 0·19 ± 0·06 | 0·67 ± 0·05 |
| Δ (‰) | 0·61 ± 0·06 | 0·37 ± 0·07 |
* D = Populus deltoides ‘S9-2’; N = P. nigra ‘Ghoy’; T = P. trichocarpa ‘V24’.