Table 2.
Effects of drought on the sizes of plant bulk and carbohydrate pools for the peak drought and the recovery labeling campaigns.
| Labeling | Parameter | C content (mgC gdm-1) | ||
|---|---|---|---|---|
|
|
||||
| Control | Drought | D a | ||
| Peak drought | Bulk shoot | 422 ± 3 | 423 ± 3 | n.s. |
| Shoot sucrose | 14 ± 0 | 16 ± 1 | ∗∗∗ | |
| Shoot fructan | 57 ± 2 | 41 ± 3 | ∗∗∗ | |
| Shoot starch | 8.1 ± 0.6 | 5.1 ± 1.4 | ∗∗ | |
| Bulk root | 345 ± 15 | 369 ± 15 | (∗) | |
| Root sucrose | 4.4 ± 0.4 | 10.8 ± 0.9 | ∗∗∗ | |
| Root fructan | 32 ± 2 | 38 ± 6 | n.s. | |
| Root starch | 12 ± 4 | 16 ± 7 | n.s. | |
| Recovery | Bulk shoot | 421 ± 4 | 422 ± 4 | n.s. |
| Shoot sucrose | 12 ± 0 | 13 ± 1 | n.s. | |
| Shoot fructan | 47 ± 4 | 33 ± 3 | ∗∗ | |
| Shoot starch | 9.0 ± 1.3 | 8.5 ± 0.8 | n.s. | |
| Bulk root | 357 ± 7 | 379 ± 8 | (∗) | |
| Root sucrose | 4.4 ± 0.6 | 2.7 ± 0.1 | ∗∗∗ | |
| Root fructan | 35 ± 6 | 29 ± 3 | n.s. | |
| Root starch | 21 ± 4 | 14 ± 4 | n.s. | |
aLevels of significance for drought effects: ∗∗∗Paovp < 0.001, ∗∗Paovp < 0.01, ∗Paovp < 0.05, (∗)Paovp < 0.1; n.s., not significant. Values represent averages among the mesocosms for each treatment (mean ± SE, n = 6), after averaging over the four sampling times for each mesocosm.