Plant morphology, secondary metabolites and chlorophyll fluorescence of Artemisia argyi under different LED environments

Abstract

Different light spectra from light-emitting diodes (LEDs) trigger species-specific adaptive responses in plants. We exposed Artemisia argyi ( A. argyi ) to four LED spectra: white (the control group), monochromatic red light (R), monochromatic blue light (B), or a mixture of R and B light of photon flux density ratio is 3 (RB), with equivalent photoperiod (14 h) and light intensity (160 μmol s −1 m −2 ). R light accelerated photomorphogenesis but decreased biomass, while B light significantly increased leaf area and short-term exposure (7 days) to B light increased total phenols and flavonoids. HPLC identified chlorogenic acid, 3,5-dicaffeoylquinic acid, gallic acid, jaceosidin, eupatilin, and taxol compounds, with RB and R light significantly accumulating chlorogenic acid, 3,5-dicaffeoylquinic acid, and gallic acid, and B light promoting jaceosidin, eupatilin, and taxol. OJIP measurements showed that B light had the least effect on the effective quantum yield ΦPSII, with higher rETR(II), Fv/Fm, qL and PIabs, followed by RB light. R light led to faster photomorphology but lower biomass than RB and B lights and produced the most inadaptability, as shown by reduced ΦPSII and enlarged ΦNPQ and ΦNO. Overall, short-term B light promoted secondary metabolite production while maintaining effective quantum yield and less energy dissipation.

Growth Light Quality Influences Leaf Surface Temperature by Regulating the Rate of Non-Photochemical Quenching Thermal Dissipation and Stomatal Conductance

“…Another study [29] noted that the photosynthetic apparatus of potato plantlets under monochromatic R light was impaired compared to those grown under monochromatic B or combined RB spectrum. In addition, the authors of [30,31] reported the adverse effects of monochromatic R light on Fv/Fm. Such a phenomenon is called "red-light syndrome", the existence of which is supported by the fact that it is evoked when plants are grown solely under R light [32].…”

The Eruca Sativa Psii Operating Efficiency Under Different Monochromatic Light

“…Тем не менее, работ, оценивающих воздействие спектра и интенсивности света на фотохимическую активность промышленно значимых культур, которой является рукола [7], недостаточно. В ряде работ [9,18,20,21,23,24] для различных культур установлено, что спектральный состав и интенсивность света оказывают значительное влияние на фотохимическую активность растений. В настоящей работе использованы интенсивности света от 100 до 1400 мкмоль/с*м 2 и монохромные световые режимы.…”