Spectral composition of LED light differentially affects biomass, photosynthesis, nutrient profile, and foliar nitrate accumulation of lettuce grown under various replacement methods of nutrient solution.

Autor: Soufi HR; Department of Horticultural Sciences, Faculty of Agriculture Vali-e-Asr University of Rafsanjan Rafsanjan Iran., Roosta HR; Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources Arak University Arak Iran., Fatehi F; Department of Agriculture Payame Noor University (PNU) Tehran Iran., Ghorbanpour M; Department of Medicinal Plants, Faculty of Agriculture and Natural Resources Arak University Arak Iran.
Jazyk: angličtina
Zdroj: Food science & nutrition [Food Sci Nutr] 2023 Oct 10; Vol. 11 (12), pp. 8143-8162. Date of Electronic Publication: 2023 Oct 10 (Print Publication: 2023).
DOI: 10.1002/fsn3.3735
Abstrakt: To enhance crop yield and quality, plant cultivation in controlled-growing systems is an alternative to traditional open-field farming. The use of light-emitting diode (LED) as an adjustable light source represents a promising approach to improve plant growth, metabolism, and function. The objective of this study was to assess the impact of different light spectra (red, red/blue (3:1), blue, and white) with an emission peak of around 656, 656, 450, and 449 nm, respectively, under various replacement methods of nutrient solution (complete replacement (CR), EC-based replacement (ECBR), and replacing based on plant needs (RBPN)), on biomass, physiological traits, and macro- and micronutrient contents of two best-known lettuce varieties, Lollo Rossa (LR) and Lollo Bionda (LB), in the nutrient film technique (NFT) hydroponic system. The results indicated that mix of red and blue LED spectra under RBPN method is the most effective treatment to enhance fresh and dry weights of lettuce plants. In addition, red LED spectrum under RBPN, and red and blue light under ECBR nutrient solution significantly increased leaf stomatal conductance, net photosynthesis and transpiration rate, and intercellular CO 2 concentration of LR variety. Phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mn) content in LR variety, and iron (Fe), zinc (Zn), copper (Cu), and manganese (Mn) content in both varieties increased upon exposure to blue and red LED light spectrum with RBPN method. Our results suggest that exposure to combination of red and blue light along with feeding plants using RBPN and ECBR methods can increase absorption of macro- and micronutrient elements and improve photosynthetic properties, and eventually increase lettuce yield with lower nitrate accumulation.
Competing Interests: The authors declare no conflict of interest.
(© 2023 The Authors. Food Science & Nutrition published by Wiley Periodicals LLC.)
Databáze: MEDLINE
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