Table 3.
Accumulation and partitioning of total soluble sugar (TSS), starch and total non structural carbohydrate (TNC) in different plant parts of Labisia pumila Benth. under different combinations of nitrogen levels and CO2 enrichment.
| Nitrogen levels | Plant parts | TSS (mg sucrose /g dry weight) | Starch (mg glucose /g dry weight) | TNC (mg /g dry weight) |
|---|---|---|---|---|
| A -180 kg N ha-1* | Leaf | 24.06 ±0.51c | 60.11 ± 0.19d | 84.16 ± 2.32c |
| Stem | 16.70 ± 1.15d | 23.01 ± 0.27d | 40.14 ± 1.67d | |
| Root | 20.21 ± 0.51c | 49. 6 ± 0.33d | 70.21 ± 2.32c | |
| 0 kg N ha-1 | Leaf | 42.71 ± 0.50a | 89.41 ± 0.28a | 131.32 ± 3.21a |
| Stem | 32.04 ± 0.84a | 80.16 ± 0.29a | 113.21 ± 1.56a | |
| Root | 38.09 ± 0.50a | 78.22 ± 0.49a | 117.34 ± 3.56a | |
| 90 kg N ha-1 | Leaf | 37.45 ± 0.49b | 78.18 ± 0.62b | 116.7 ± 5.77b |
| Stem | 22.26 ± 0.44b | 45.27 ± 0.47b | 67.23 ± 6.22b | |
| Root | 33.66 ± 0.49b | 67.98 ± 0.51b | 103.21 ± 7.55b | |
| 180 kg N ha-1 | Leaf | 32.64 ± 0.59c | 86.22 ± 0.23c | 118.78 ± 5.67b |
| Stem | 15.10 ± 0.99d | 51.03 ± 0.25c | 66.31 ± 6.90c | |
| Root | 28.86 ± 0.58c | 66.67 ± 0.44c | 96.75 ± 7.90c | |
| 270 kg N ha-1 | Leaf | 23.80 ± 1.16d | 57.66 ± 0.23d | 82.22 ± 6.89d |
| Stem | 8.96 ± 0.70d | 32.42 ± 0.21d | 41.31 ± 8.65d | |
| Root | 20.02 ± 1.17d | 48.20 ± 0.28d | 68.31 ± 7.96d |
All analyses are mean ± standard error of mean (SEM), N = 15. Means not sharing a single letter were significantly different at P ≤ 0.05. A = Control at ambient CO2 levels (400 µmol-1 mol-1) and standard Nitrogen fertilization rates (180 kg N ha-1).