ISHS Acta Horticulturae 1271: XXX International Horticultural Congress IHC2018: III International Symposium on Innovation and New Technologies in Protected Cultivation
Pulsed light-emitting diodes for higher contents of mineral elements in mustard microgreens |
| Authors: | V. Vaštakaitė-Kairienė, A. Brazaitytė, A. Viršilė, G. Samuolienė, J. Miliauskienė, J. Jankauskienė, P. Duchovskis |
| Keywords: | Brassica juncea, continuous light, ICP-OES, minerals, nutritional value |
| DOI: | 10.17660/ActaHortic.2020.1271.21 |
| Abstract:
In this study the effects of monochromatic pulsed light-emitting diode (LED) lighting on accumulation of mineral elements in mustard (Brassica juncea L., 'Red Lion') microgreens were evaluated. Plants were grown indoors under the main high-pressure sodium (HPS) lighting supplemented with 20±2 μmol m‑2 s‑1 photosynthetic photon flux density (PPFD) of monochromatic 455, 470, 505, 590, or 627 nm LED (total PPFD 200±20 μmol m‑2 s‑1; 16 h day‑1). For pulsed light treatments, the frequencies at 2, 32, 256, and 1024 Hz with a duty cycle of 50% of monochromatic LED were applied. The results were compared with those under the continuous light (0 Hz) condition in terms of mineral elements. The contents of macro- and microelements were determined by microwave assisted digestion combined with inductively coupled plasma optical emission spectrometry (ICP-OES). The significant differences in the response of mineral elements between pulsed light at several frequencies and continuous light were determined. The highest content of potassium under the treatment of blue 455 nm and yellow 590 nm at 2 Hz frequency was determined. All the supplemented monochromatic wavelengths affected the higher content of calcium at 32 and 256 Hz frequencies. The similar tendencies for accumulation of phosphorus and sulfur were determined. The pulsed LED light had negative effect for accumulation of magnesium. The significantly higher contents of iron and zinc were measured in mustard, grown under all supplemental pulsed LED (except blue 470 nm) at 2, 32, and 256 Hz frequencies. It was concluded that supplemental to HPS lamps royal blue 455 nm, cyan 505 nm and yellow 590 nm LED light at 32 and 256 Hz frequencies had the most distinguished effects on accumulation of mineral elements in mustard microgreens. | |
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