Sprouting Broccoli Accumulate Higher Concentrations of Nutritionally Important Metabolites under Narrow-band Light-emitting Diode Lighting

• DOI: 10.21273/jashs.139.4.469
• Publication Date: 2019-01-31T18:50:34Z
• Authors: Dean A. Kopsell; Carl E. Sams; T. Casey Barickman; Robert C. Morrow
• Keywords: Sprouting; Incandescent light bulb; Light intensity

Previous research in our group demonstrated that short-duration exposure to narrow-band blue wavelengths of light can improve the nutritional quality sprouting broccoli ( Brassica oleacea var. italica ) microgreens. The objective this study was measure impact different percentages on concentrations parameters microgreens and compare incandescent/fluorescent with light-emitting diodes (LEDs). Microgreen seeds were cultured hydroponically growing pads under treatments of: 1) fluorescent/incandescent light; 2) 5% (442 452 nm)/95% red (622 632 nm); 3) blue/85% red/10% green (525 535 4) 20% blue/80% red; 5) blue/70% controlled environments. Microgreens grown at an air temperature 24 °C a 16-hour photoperiod using intensity 250 μmol·m −2 ·s −1 for all treatments. On emergence first true leaf, nutrient solution 42 mg·L nitrogen (N) (20% Hoagland’s #2 solution) used submerge pads. harvested after 20 days shoot tissues processed measured nutritionally important pigments, glucosinolates, mineral nutrients. treatment had significantly lower fresh mass than plants blue/95% red, green, LED highest tissue chlorophyll, β-carotene, lutein, total carotenoids, calcium (Ca), magnesium (Mg), phosphorus (P), sulfur (S), boron (B), copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), zinc (Zn), glucoiberin, glucoraphanin, 4-methoxyglucobrassicin, neoglucobrassicin found treatment. In general, resulted most metabolites tissue. Results from current clearly support data many previous reports describe stimulation primary secondary metabolite biosynthesis by LEDs.