Abstract
Far-red light is electromagnetic radiation with wavelengths of 700–800 nm. Light of such wavelengths does not fall into the range of photosynthetically active radiation (PAR) but plays an informational role in plants and indirectly influences the photosynthetic rate. In this study, garden cress (Lepidium sativum L.) was grown under illumination with different red to far-red light ratios (RL/FRL) in the overall lighting spectrum. The treatments with RL/FRL ratios of 1.1, 0.8, and 0.5 were applied. Effects of RL/FRL ratio on plant height, the content of chlorophylls and carotenoids, and photosynthesis were examined. The decrease in RL/FRL ratio in grow light led to elongation of cress plants and reduced the content of photosynthetic pigments. Lighting with ratios RL/FRL = 0.8 and RL/FRL = 0.5 did not reduce the photosynthetic capacity (on the 14th day of the experiment), which can be regarded as a positive effect. Lighting with a ratio RL/FRL = 1.1 was accompanied by the reduction of photosynthesis, which was probably due to a significant decrease in the content of chlorophylls and carotenoids.
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ACKNOWLEDGMENTS
We thank the ECOLED-Trade company for providing LED lamps ECOLED-BIO-37-RF-D120-F-Trade IP65 (4000K) for this study.
Funding
This work was supported by the Ministry of Education and Science of the Russian Federation according to the state assignment no. NIOKTR 122031100058–3.
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T.N. Lisina planned the experiment, devised the experimental design, and wrote the manuscript. O.V. Burdysheva and E.S. Sholgin designed a grow box and adjusted the lighting protocols. V.A. Parfenkova and O.A. Chetina performed the experiments and processed experimental data.
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Translated by A. Bulychev
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Abbreviations: LED—light-emitting diode; FRL—far-red light; PAR—photosynthetically active radiation; RL—red light.
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Lisina, T.N., Chetina, O.A., Parfenkova, V.A. et al. The Ratio of Red to Far-Red Light Affects Growth, Pigment Content, and Photosynthetic Rates in Cress Plants. Russ J Plant Physiol 71, 27 (2024). https://doi.org/10.1134/S1021443724604324
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DOI: https://doi.org/10.1134/S1021443724604324