Table 1 The effect of Red, Blue, Fluorescent light, and combined LEDs of red and blue light [RB (1:1, 8:2, and 2:8) on plant growth parameters and leaf relative water content (%) in Digitalis purpurea L., under a closed type plant factory. The data represents mean ± standard error. Data for each column followed by the different alphabets are significantly different according to Duncan’s multiple range test at p < 0.05.

From: Enhanced growth and cardenolides production in Digitalis purpurea under the influence of different LED exposures in the plant factory

LED treatment

Plant height (cm)

No. of leaf (n)

Leaf length

Leaf width

Leaf area

Length of longest root

Leaf relative water content (%)

R

17.73 ± 0.64b

26.33 ± 2.03b

17.07 ± 0.72b

6.47 ± 0.50a

318.04 ± 49.66b

24.57 ± 1.88a

77.55 ± 0.58d

B

22.43 ± 0.28a

24.67 ± 1.45b

20.57 ± 1.26a

5.20 ± 0.36a

322.32 ± 29.92b

28.17 ± 2.88a

88.02 ± 1.00ab

FL

13.10 ± 1.55c

22.33 ± 1.86b

12.30 ± 1.33 cd

5.73 ± 0.77a

330.66 ± 64.05b

29.20 ± 2.40a

83.59 ± 0.58c

RB (1:1)

12.67 ± 0.38c

27.67 ± 1.67b

11.57 ± 0.37d

5.10 ± 0.45a

375.08 ± 73.65b

25.60 ± 1.21a

89.00 ± 1.00a

RB (8:2)

15.53 ± 0.24b

43.33 ± 1.76a

14.70 ± 0.42bc

6.50 ± 0.58a

608.92 ± 61.74a

29.40 ± 4.52a

85.55 ± 1.21bc

RB (2:8)

12.13 ± 0.49c

27.67 ± 1.45b

11.16 ± 0.49d

5.73 ± 0.43a

368.24 ± 38.44b

27.83 ± 1.73a

83.59 ± 0.88c

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