Table III.
Comparison of GA levels in various organs of spinach in SD and after 8 LD
Spinach plants were grown in SD for 6 weeks, then transferred to LD for 8 d. GA content was determined by GC-MS-selected ion monitoring, using deuterated GAs as internal standards.
| Plant Part | GA53 | GA19 | GA20 | GA1 | GA29+81 | GA8 | GA110 | GA97 |
|---|---|---|---|---|---|---|---|---|
| Mature blades | ||||||||
| SD | 4.6a | 31.8 | 2.7 | 1.7 | 13.5 | 1.3 | 8.5 | 191.1 |
| 8 LD | 2.1 | 23.5 | 23.6 | 2.7 | 36.4 | 3.2 | 1.3 | 73.0 |
| Petioles | ||||||||
| SD | 24.6 | 51.3 | 1.7 | 1.6 | 2.7 | 2.9 | 18.9 | 477.5 |
| 8 LD | 21.7 | 145.3 | 36.7 | 4.1 | 42.3 | 32.3 | 4.7 | 446.0 |
| Young leaves | ||||||||
| SD | 7.2 | 54.4 | 3.0 | 4.5 | 10.1 | 1.3 | 16.2 | 286.3 |
| 8 LD | 31.1 | 138.4 | 43.4 | 19.4 | 84.7 | 9.9 | 2.4 | 178.7 |
| Shoot tips | ||||||||
| SD | 24.7 | 61.3 | 2.2 | 3.8 | 16.0 | 3.8 | 18.3 | 880.0 |
| 8 LD | 66.6 | 173.5 | 31.4 | 16.4 | 66.7 | 37.1 | 13.4 | 696.2 |
a
Values are in ng g−1 dry weight.