Combination of Selenium and UVA Radiation Affects Growth and Phytochemicals of Broccoli Microgreens

Abstract

Addition of selenium or application of ultraviolet A (UVA) radiation for crop production could be an effective way of producing phytochemical-rich food. This study was conducted to investigate the effects of selenium and UVA radiation, as well as their combination on growth and phytochemical contents in broccoli microgreens. There were three treatments: Se (100 μmol/L Na2SeO3), UVA (40 μmol/m2/s) and Se + UVA (with application of Se and UVA). The control (CK) was Se spraying-free and UVA radiation-free. Although treatment with Se or/and UVA inhibited plant growth of broccoli microgreens, results showed that phytochemical contents increased. Broccoli microgreens under the Se treatment had higher contents of total soluble sugars, total phenolic compounds, total flavonoids, ascorbic acid, Fe, and organic Se and had lower Zn content. The UVA treatment increased the contents of total chlorophylls, total soluble proteins, total phenolic compounds, and FRAP. However, the Se + UVA treatment displayed the most remarkable effect on the contents of total anthocyanins, glucoraphanin, total aliphatic glucosinolates, and total glucosinolates; here, significant interactions between Se and UVA were observed. This study provides valuable insights into the combinational selenium and UVA for improving the phytochemicals of microgreens grown in an artificial lighting plant factory.

Effect of Supplemental UV-A Intensity on Growth and Quality of Kale under Red and Blue Light

“…Supplemental UV-A (6 µmol·m −2 s −1 ) increased 1 higher maltose in red leaf lettuce by a factor of 1.76 [ 25 ]. Supplemental UV-A treatment (40 µmol·m −2 s −1 ) increased the contents of total soluble proteins, total phenolic compounds, and FRAP of broccoli microgreens more than CK (red:blue:green = 1:1:1, 30 µmol·m −2 s −1 ) [ 26 ]. In red- and green-leaf pak-choi, the highest soluble protein contents were presented under supplemental 100 µmol·m −2 s −1 UV-A (380 nm), which were 108.16% and 184.52% higher than CK under glasshouse, respectively.…”

RNA-Seq Analysis Demystify the Pathways of UV-A Supplementation in Different Photoperiods Integrated with Blue and Red Light on Morphology and Phytochemical Profile of Kale

“…The compounds overproduced by 2 h UV-A (3.16 W·m −2 ) treatment were GAH I, 4-O-CQA, GAD, sinapic acid and 1-S-2, 2-diFG, with increments of ~14, 42, 48, 7, and 61%, as compared to 7-day-old control broccoli sprouts [ 60 ]. Supplemental UV-A radiation (40 µmol·m −2 s −1 ) dramatically enhanced FRAP (~18.3%) of broccoli microgreens [ 61 ]. In response to various stress stimuli in nature, plants produce a range of antioxidants to reduce stress, including glutathione (GSH).…”

Effects of Plant Hormones, Metal Ions, Salinity, Sugar, and Chemicals Pollution on Glucosinolate Biosynthesis in Cruciferous Plant

“…capitata L.) indole-3-carbinol and indole-3-acetonitrile ( Penas et al, 2012 ); the total GSLs and the sinigrin contents also increased exposure to Na 2 SeO 3 alone or in combination with NaCl ( Sun et al, 2018 ). Besides, the glucoraphanin, glucobrassicin, 4-methoxy-glucobrassicin, and total indole GSLs contents were significantly affected ( Gao et al, 2021 ), while the aliphatic GSLs (glucoraphanin and glucoerucin) were not affected by Na 2 SeO 3 in broccoli ( B. oleracea L. var. italica ) sprouts ( He et al, 2020 ).…”