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Article

Effects of Different Light Spectra on Final Biomass Production and Nutritional Quality of Two Microgreens

1
Department of Agriculture, Food and Environment (Di3A), Università degli Studi di Catania, 95123 Catania, Italy
2
IBE-Istituto di BioEconomia, Consiglio Nazionale delle Ricerche, 95126 Catania, Italy
3
Department of Agricultural and Environmental Sciences, Università degli Studi di Milano, 20133 Milan, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Eva Darko
Plants 2021, 10(8), 1584; https://doi.org/10.3390/plants10081584
Received: 6 July 2021 / Revised: 26 July 2021 / Accepted: 28 July 2021 / Published: 31 July 2021
(This article belongs to the Special Issue The Effects of LED Light Spectra and Intensities on Plant Growth)
To improve microgreen yield and nutritional quality, suitable light spectra can be used. Two species—amaranth (Amaranthus tricolor L.) and turnip greens (Brassica rapa L. subsp. oleifera (DC.) Metzg)—were studied. The experiment was performed in a controlled LED environment growth chamber (day/night temperatures of 24 ± 2 °C, 16 h photoperiod, and 50/60% relative humidity). Three emission wavelengths of a light-emitting diode (LED) were adopted for microgreen lighting: (1) white LED (W); (2) blue LED (B), and (3) red LED (R); the photosynthetic photon flux densities were 200 ± 5 µmol for all light spectra. The response to light spectra was often species-specific, and the interaction effects were significant. Morphobiometric parameters were influenced by species, light, and their interaction; at harvest, in both species, the fresh weight was significantly greater under B. In amaranth, Chl a was maximized in B, whereas it did not change with light in turnip greens. Sugar content varied with the species but not with the light spectra. Nitrate content of shoots greatly varied with the species; in amaranth, more nitrates were measured in R, while no difference in turnip greens was registered for the light spectrum effect. Polyphenols were maximized under B in both species, while R depressed the polyphenol content in amaranth. View Full-Text
Keywords: LED; light spectrum; ascorbic acid; chlorophylls; carotenoids LED; light spectrum; ascorbic acid; chlorophylls; carotenoids
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MDPI and ACS Style

Toscano, S.; Cavallaro, V.; Ferrante, A.; Romano, D.; Patané, C. Effects of Different Light Spectra on Final Biomass Production and Nutritional Quality of Two Microgreens. Plants 2021, 10, 1584. https://doi.org/10.3390/plants10081584

AMA Style

Toscano S, Cavallaro V, Ferrante A, Romano D, Patané C. Effects of Different Light Spectra on Final Biomass Production and Nutritional Quality of Two Microgreens. Plants. 2021; 10(8):1584. https://doi.org/10.3390/plants10081584

Chicago/Turabian Style

Toscano, Stefania, Valeria Cavallaro, Antonio Ferrante, Daniela Romano, and Cristina Patané. 2021. "Effects of Different Light Spectra on Final Biomass Production and Nutritional Quality of Two Microgreens" Plants 10, no. 8: 1584. https://doi.org/10.3390/plants10081584

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