Table 2.
Growth characteristics of A. triphylla seedling grown under different supplementary light sources.
| Treatment | Stem diameter (mm) | Total length (mm) | Total DW (g) | Shoot DW (g) | Root DW (g) | SLW b (10−2 g·cm−2) | No. of leaves | Root to shoot ratio |
|
| ||||||||
| HPS | 3.0 ± 0.2 b | 207.9 ± 5.7 a | 0.19 ± 0.02 b | 0.15 ± 0.01 b | 0.04 ± 0.01 c | 1.95 ± 0.06 b | 4.8 ± 0.4 a | 0.30 ± 0.04 b |
| MH | 3.4 ± 0.2 ab | 211.3 ± 7.7 a | 0.31 ± 0.03 a | 0.24 ± 0.02 a | 0.07 ± 0.01 ab | 1.94 ± 0.09 b | 6.6 ± 0.6 a | 0.30 ± 0.04 b |
| FR | 2.2 ± 0.1 c | 172.9 ± 8.5 b | 0.11 ± 0.01 c | 0.09 ± 0.01 c | 0.02 ± 0.00 d | 1.53 ± 0.09 c | 4.7 ± 0.5 a | 0.21 ± 0.03 b |
| LED-w | 3.0 ± 0.1 b | 216.5 ± 10.6 a | 0.28 ± 0.03 a | 0.24 ± 0.02 a | 0.05 ± 0.01 bc | 2.21 ± 0.09 a | 5.6 ± 0.7 a | 0.22 ± 0.02 b |
| LED-mix | 3.8 ± 0.2 a | 199.8 ± 5.3 a | 0.30 ± 0.03 a | 0.22 ± 0.02 a | 0.08 ± 0.01 a | 2.20 ± 0.08 a | 6.0 ± 0.4 a | 0.42 ± 0.05 a |
DW: dry weight; SLW: specific leaf weight; HPS: high pressure sodium; MH: metal halide; FR: far-red; LED-w: white (red: green: blue = 2:4:3) LED; and LED-mix: mixed (red: green: blue =4: 1: 4) LED. Data are presented as the mean ± standard error of mean (n = 10). Different letters (a, b, and c) indicate significant differences (p < 0.05) among treatments.