Supplementary Light Source Affects Growth, Metabolism, and Physiology of Adenophora triphylla (Thunb.) A.DC. Seedlings
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.
