Table 1 Biomass and growth characters of lettuce at harvest (54 DAS).

From: Sugar accumulation and growth of lettuce exposed to different lighting modes of red and blue LED light

Light treatment

Fresh weight (g)

Dry weight (g)

Plant height (mm)

Stem diameter (mm)

Leaf number

Shoot

Root

Shoot

Root

R

83.03b

8.63a

3.75b

0.37a

264.13a

8.29b

21ab

B

61.71d

6.12c

2.96c

0.29b

210.63c

7.41c

18c

RB

74.66c

7.60b

3.04bc

0.40a

227.65b

7.39c

20b

R/RB/B

82.02b

8.62a

3.88b

0.38a

251.03ab

7.95bc

22a

R/B(4 h)

67.65cd

7.03b

3.55b

0.38a

229.10b

7.02c

20b

R/B(1 h)

93.33a

8.00a

4.36a

0.36a

255.64ab

9.25a

22a

  1. Lower-case letters after the same parameter indicate significant difference at the 0.05 level by Tukey’s test, n = 3.
  2. R: monochromatic red light for 16 h over a 16-hour photoperiod; B: monochromatic blue light for 16 h over a 16-hour photoperiod; RB: simultaneous red and blue light for 8 h over a 24-hour period; R/RB/B: light switching from monochromatic red (lasted for 4 h) to simultaneous red and blue (lasted for 4 h) and then to monochromatic blue (lasted for 4 h) over a 24-hour period; R/B(4 h): alternating red and blue light with an interval of 4 h over a 16-hour photoperiod; R/B(1 h): alternating red and blue light with an interval of 1 h over a 16-hour photoperiod.
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