Table 3.
Rates of decrease in O2 and increase in CO2 in the gas space above the water in each treatment
| Gas treatment in gas space | Plant conditions | Decreased O2 (μmol g−1 DWRoot h−1) | Increased CO2 (μmol g−1 DWRoot h−1) |
|---|---|---|---|
| Air | Control | 1·72 ± 0·56a | 0·98 ± 0·10a |
| Flood Ae-Open | 56·6 ± 3·49b | 22·2 ± 0·27c | |
| Flood Ae-Submerged | 12·2 ± 0·98a | 7·49 ± 0·82b | |
| Oxygen | Control | 15·8 ± 6·84a | 0·82 ± 0·22a |
| Flood Ae-Open | 191 ± 18·3b | 33·4 ± 1·68c | |
| Flood Ae-Submerged | 35·2 ± 13·4a | 8·12 ± 0·34b |
See Fig. 2 for an illustration of the treatment conditions.
Flood Ae-Open, Aerenchyma and lenticels above the water; Flood Ae-Submerged, submerged aerenchyma and lenticels.
Values are the mean (±s.e.) of three plants.
Means followed by the same letter within each column for the treatments do not differ significantly (P < 0·01, Tukey's test).