Chl a

Chl b

Total Chl

Lettuce

Control

7.17 ± 2.04

17.61 ± 1.29

109 ± 4.14

High [CO₂]

6.56 ± 0.47

27.77 ± 6.32

136 ± 14.00

Spinach

Control

4.76 ± 0.54

17.57 ± 0.68

82.89 ± 3.26

High [CO₂]

4.11 ± 0.61

17.74 ± 2.48

80.07 ± 11.42