Table II.
Influence of growth [CO2] and seed vernalization on leaf elongation rate (E), the lengths of mature sister cells or elements (If and I*f, respectively), and the cell flux (F, number of cells and elements moving in and out of the leaf epidermal elongation zone per unit of time)
| Genotype | Vernalization | [CO2] | E | I*f | If | F |
|---|---|---|---|---|---|---|
| ppm | mm/h | μm | cells h−1 | |||
| Birch | Yes | 350 | 1.45a | 218 | 210 | 6.7a |
| 900 | 1.70cd | 208 | 201 | 8.2cd | ||
| No | 350 | 1.54ab | 206 | 201 | 7.5c | |
| 900 | 1.89e | 205 | 203 | 9.2e | ||
| Hartog | Yes | 350 | 1.53ab | 210 | 201 | 7.4b |
| 900 | 1.76d | 198 | 189 | 8.9d | ||
| No | 350 | 1.63bc | 206 | 200 | 8.0b | |
| 900 | 1.78d | 195 | 190 | 9.2d | ||
[CO2] and vernalization had statistically significant effects (P ≤ 0.05) on E and F (values followed by a different letter within a column) but not on If and I*f (GLM analysis of variance, see “Materials and Methods”).