Table 2.
Effects of 5 % CO2, 5 µL L−1 ethylene and 1 % O2 on shoot elongation in arrowhead tubers with or without 1 mm pyrazol
| O2 |
CO2 |
C2H4 |
Pyrazol |
Elongation (mm) |
|---|---|---|---|---|
| Air | − | − | − | 6·3a ± 1·4 |
| − | − | + | 5·1 ± 1·1 | |
| + | − | − | 13·1b ± 1·1 | |
| + | − | + | 10·9 ± 1·3 | |
| − | + | − | 14·3b ± 1·7 | |
| − | + | + | 11·3 ± 1·2 | |
| + | + | − | 20·0c ± 2·0 | |
| + | + | + | 11·9* ± 2·2 | |
| 1 % O2 | − | − | − | 16·4c ± 1·3 |
| − | − | + | 11·8* ± 1·4 | |
| + | − | − | 20·4c ± 1·6 | |
| + | − | + | 15·3* ± 1·4 | |
| − | + | − | 22·3d ± 1·3b | |
| − | + | + | 18·0* ± 1·5 | |
| + | + | − | 24·7d ± 1·8b | |
| + | + | + | 18·3* ± 2·1 |
Elongation was measured after incubation for 2 d in the dark. Data are the means ± s.e. of 6−22 determinations in three different experiments. Significant differences between two gaseous conditions without pyrazol are shown at P < 0·05 with different letters (a, b, c and d). Asterisks show significant differences at P < 0·05 between treatments with and without pyrazol under the same gaseous conditions.