Experimental study shows tuned red to far-red light ratios enhance lettuce growth and photoprotection under high light stress, indicating an optimal spectral strategy for indoor farming.
The effects of additional far-red light (FRL) on the growth parameters, photosynthetic activity, and pro- or antioxidant balance of Lactuca sativa L. plants grown for 30 d were studied. The plants were grown under white light-emitting diodes with equal PAR intensities at red/far-red light ratios of 0.29, 0.89, and 1.67 and without FRL. Compared to the absence of the FRL, growth at a 0.29 ratio caused an increase in plant biomass and leaf area, but a decrease in PSII activity, net photosynthetic rate (PN) per unit area, and stomatal conductance. High irradiance for 4 h at 1,000 μmol(photon) m-2 s-1 decreased PSII activity and PN, but to the least extent in the 0.89 option. The possible pathways of the FRL's impact on the photosynthetic apparatus were analysed.
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Kreslavski et al. (2025) studied this question.
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