Effect of supplemental UV-A irradiation in solid-state lighting on the growth and phytochemical content of microgreens
 
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1
Institute of Horticulture, Lithuanian Research Centre for Agriculture and Forestry, Kaunas str. 30, LT-54333 Babtai, Kaunas distr., Lithuania
2
Institute of Applied Research, Vilnius University, Saulėtekio al. 9-III, LT-10222 Vilnius, Lithuania
 
Int. Agrophys. 2015, 29(1): 13–22
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ABSTRACT
In this study, we sought to find and employ positive effects of UV-A irradiation on cultivation and quality of microgreens. Therefore, the goal of our study was to investigate the influence of 366, 390, and 402 nm UV-A LED wavelengths, supplemental for the basal solid-state lighting system at two UV-A irradiation levels on the growth and phytochemical con­tents of different microgreen plants. Depending on the species, supplemental UV-A irradiation can improve antioxidant proper­ties of microgreens. In many cases, a significant increase in the investigated phytochemicals was found under 366 and 390 nm UV-A wavelengths at the photon flux density (12.4 μmol m-2 s-1). The most pronounced effect of supplemental UV-A irradiation was detected in pak choi microgreens. Almost all supplemental UV-A irradiation treatments resulted in increased leaf area and fresh weight, in higher 2,2–diphenyl–1–picrylhydrazyl free-radi­cal scavenging activity, total phenols, anthocyanins, ascorbic acid, and α-tocopherol.
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