Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, "G. Bonchev" Str., Bl. 21, Sofia, 1113, Bulgaria.
Agricultural Institute, Centre of Agricultural Research, HUN REN, Brunszvik Str. 2, Martonvásár, 2462, Hungary.
Plant Physiol Biochem. 2024 Dec;217:109218. doi: 10.1016/j.plaphy.2024.109218. Epub 2024 Oct 20.
The extensive development in light-emitting diodes (LEDs) in recent years provides an opportunity to positively influence plant growth and biomass accumulation and to optimize biochemical composition and nutritional quality. This study aimed to assess how different light spectra affect the growth, photosynthesis and biochemical properties of Eruca sativa. Therefore two LED lighting modes - red:blue (RB, 1:1) and red:green:blue (RGB, 2:1:2) were compared to the conventional white light fluorescent tubes (WL). Plant biomass, photosynthetic performance, several antioxidants, polyamines and nitrates contents were analyzed across different treatments. The plant growth was affected by the light quality - the presence of green light in the spectrum resulted in smaller plants and leaves, and correspondingly less biomass. RB spectral mode enhanced the total antioxidant and guaiacol peroxidase activity, pigments, flavonoids, polyphenols, ascorbate and polyamines contents. This effect under RB was combined with better leaf development compared to RGB and less nitrate in the leaves among all treatments. The RB light generated modifications in polyamines, which are interrelated with the nitrate content, further induce important metabolite and antioxidant changes. Both RB and RGB enhanced photosynthesis. The afterglow thermoluminescence band varied according to leaves development, being higher in RB and WL as a consequence of their faster growth. The RB light spectrum was found to be the most efficient for promoting the growth, biochemical composition, and overall quality of Eruca sativa compared to RGB and WL. These findings suggest that RB LEDs can be an effective tool for improving crop production in controlled environments.
近年来，发光二极管（LED）的广泛发展为积极影响植物生长和生物量积累、优化生化组成和营养品质提供了机会。本研究旨在评估不同的光光谱如何影响芝麻菜的生长、光合作用和生化特性。因此，将两种 LED 照明模式——红：蓝（RB，1:1）和红：绿：蓝（RGB，2:1:2）与传统的白色荧光灯管（WL）进行了比较。对不同处理条件下的植物生物量、光合作用性能、几种抗氧化剂、多胺和硝酸盐含量进行了分析。植物的生长受到光质的影响——光谱中绿光的存在导致植物和叶片变小，相应的生物量也减少。RB 光谱模式增强了总抗氧化剂和愈创木酚过氧化物酶活性、色素、类黄酮、多酚、抗坏血酸和多胺含量。与 RGB 相比，RB 下的这种效应与叶片中较少的硝酸盐相结合，导致叶片发育更好。RB 产生的多胺变化与硝酸盐含量有关，进一步诱导了重要的代谢物和抗氧化剂变化。RB 和 RGB 均增强了光合作用。余辉热释光带根据叶片发育而变化，RB 和 WL 的生长较快，其值较高。与 RGB 和 WL 相比，RB 光光谱被发现是促进芝麻菜生长、生化组成和整体品质的最有效光谱。这些发现表明，RB LED 可以成为在受控环境中提高作物产量的有效工具。
