Articles
Effect of LED light spectrum on two lettuce cultivars grown in a vertical farm system
Article number
1441_8
Pages
59 – 66
Language
English
Abstract
The light spectrum is a factor that can modify the growth and development of plants.
This study investigated the impact of light spectrum on young green and red lettuce plants grown under different light spectra in a vertical farm.
Green lettuce ‘Bartimer’ and red lettuce ‘Soltero’ were grown by 14 days after transplanting under three LED light spectrum treatments (UV:Blue (B):Green (G):Red (R):far red (FR) (%); R/B) named as white light (WL, 0:26:49:22:3; 0.9), blue-white (BW, 0:18:39:38:5; 2.1), red-white (RW, 1:17:24:47:11; 2.8), and red-blue (RB, 1:20:8:62:9; 3.1) under photon flux of 90 µmol m‑2 s‑1 and a photoperiod of 12/12. Fresh weight (FW), leaf number, total phenol concentration, and antioxidant capacity (DPPH) responded to the interaction between light and cultivar. ‘Bartimer’ significantly increased FW under WL compared to all light treatments applied to both cultivars by an average of 111%. The number of leaves was significantly higher in ‘Bartimer’ grown under the WL than in the rest of the treatments.
Besides, ‘Soltero’ under RW and WL raised the concentration of total phenols and antioxidant capacity (DPPH) versus the rest of the light treatments applied in both cultivars by an average of 14%. On the other hand, dry matter percentage (DMP) and leaf number responded to light treatment and cultivar independently.
DM increased in lettuce treated with RW compared to WL, RB, and BW by 6.9, 17.5, and 25.6%, respectively.
Likewise, ‘Soltero’ exacerbated DMP compared to ‘Bartimer’ by 30%. The provision of RW ameliorated DMP in both lettuce cultivars and the antioxidant activity in red lettuce, improving the intrinsic quality of the lettuce.
This study investigated the impact of light spectrum on young green and red lettuce plants grown under different light spectra in a vertical farm.
Green lettuce ‘Bartimer’ and red lettuce ‘Soltero’ were grown by 14 days after transplanting under three LED light spectrum treatments (UV:Blue (B):Green (G):Red (R):far red (FR) (%); R/B) named as white light (WL, 0:26:49:22:3; 0.9), blue-white (BW, 0:18:39:38:5; 2.1), red-white (RW, 1:17:24:47:11; 2.8), and red-blue (RB, 1:20:8:62:9; 3.1) under photon flux of 90 µmol m‑2 s‑1 and a photoperiod of 12/12. Fresh weight (FW), leaf number, total phenol concentration, and antioxidant capacity (DPPH) responded to the interaction between light and cultivar. ‘Bartimer’ significantly increased FW under WL compared to all light treatments applied to both cultivars by an average of 111%. The number of leaves was significantly higher in ‘Bartimer’ grown under the WL than in the rest of the treatments.
Besides, ‘Soltero’ under RW and WL raised the concentration of total phenols and antioxidant capacity (DPPH) versus the rest of the light treatments applied in both cultivars by an average of 14%. On the other hand, dry matter percentage (DMP) and leaf number responded to light treatment and cultivar independently.
DM increased in lettuce treated with RW compared to WL, RB, and BW by 6.9, 17.5, and 25.6%, respectively.
Likewise, ‘Soltero’ exacerbated DMP compared to ‘Bartimer’ by 30%. The provision of RW ameliorated DMP in both lettuce cultivars and the antioxidant activity in red lettuce, improving the intrinsic quality of the lettuce.
Publication
Authors
C. Hernández-Adasme, M.A. Faicán Benenaula, M.J. Guevara, Bo Sun, Xiao Yang, V. Escalona
Keywords
Lactuca sativa L., wavelength, antioxidant compound, in-door conditions
Groups involved
- Division Landscape and Urban Horticulture
- Division Greenhouse and Indoor Production Horticulture
- Division Precision Horticulture and Engineering
- Division Plant-Environment Interactions in Field Systems
- Division Horticulture for Human Health
- Division Vegetables, Roots and Tubers
- Working Group Vertical Farming
- Working Group Urban Horticulture
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