Responses of Brassica microgreens to LED light spectra
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Abstract
Microgreens are seedling–stage vegetables that contain higher nutrition values than their respective mature stage. Hence, they are being popular among health–loving consumer and their production in controlled environment condition by using LED lighting has already begun. Light spectrum is the critical factor affecting the growth and quality of produces grown under artificial lighting. Hence, the objective of this study is to investigate the effects of light spectra on growth and some health–benefit phytochemicals of 3 brassica microgreens namely; Broccoli, Arugula and Purple kohlrabi. Three studies were conducted for each brassica microgreen by using a randomized completely block design with 3 replications and 6 LED light spectrum treatments consisting of white, red, blue, and red and blue with ratio of 2:1, 1:1 and 1:2, respectively. The light intensity and photoperiod were controlled at PPFD 150 µmol·m–2·s–1 for 12 h per day. The air temperature was controlled at 25 °C and the relative humidity and CO2 concentration in the grow room ranged between 65–80% and 350 ±50 ppm, respectively. All microgreens were harvested 12 days after sowing. The results revealed that red light gave the highest height, fresh weight and dry weight while white light gave the highest chlorophyll content for all microgreen species. Light spectrum with high blue light proportion promoted vitamin C and DDPH antioxidant capacity. Nevertheless, the optimum light spectrum promoting carotenoids and phenolic compounds varied with microgreen species.
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