Table 3. Gas exchange parameters transpiration rate (E), stomatal conductance (Gs), net photosynthesis (Pn) and water use efficiency (WUE) in basal and apical leaves of L. japonicus Gifu B-129 and MG-20 plants.
| E | Gs | Pn | WUE | |||
| (mol H2O m−2 s−1) | (mmol H2O m−2 s−1) | (µmol CO2 m−2 s−1) | (µmol CO2 mmol−1H2O) | |||
| Basal leaf | Gifu B-129 | control | 2,22±0,25a | 197±35a | 3,6±0,6a | 1,7±0,2a |
| alkaline | 1,48±0,29a | 126±41a | 1,5±0,6b | 1,1±0,2b | ||
| MG-20 | control | 2,18±0,25a | 213±36a | 3,1±0,6ab | 1,5±0,2a | |
| alkaline | 1,69±0,25a | 178±36a | 2,9±0,6ab | 1,7±0,2a | ||
| Apical leaf | Gifu B-129 | control | 2,2±0,4a | 197±41a | 2,9±0,5a | 1,28±0,25a |
| alkaline | 2,4±0,4a | 214±41a | 0,9±0,5b | 0,43±0,25b | ||
| MG-20 | control | 2±0,4a | 200±41a | 3,3±0,5a | 1,63±0,25a | |
| alkaline | 1,8±0,5a | 193±47a | 2,33±0,6ab | 1,4±0,28a |
Seven-day-old plants were watered with 0.50 Hoagland’s nutrient solution, with or without the addition of 10 mM NaHCO3 during a period of 21 days. Results are the mean of 12 biological replicates ±SE. Statistical differences between control and treatments within each ecotype are shown as P<0.001 (Duncan’s post-hoc test).