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<p>Light is a key environmental factor regulating plant growth, development, and accumulation of primary and secondary metabolites. Broccoli microgreens represent a Brassicaceae variety with a high market share, characterized by high nutrient density, strong environmental adaptability, and promising market returns, thus offering both substantial health benefits and economic value in cultivation. However, the effects of different red-to-blue light ratios on broccoli microgreens are largely unexplored. In this study, white light (CK) was used as a control to explore the effects of red (R), blue (B), and red–blue mixed (R5B1, R3B1, and R1B1) lights on the growth and bioactive compound content in broccoli microgreens. Treatment with different red and blue lights did not significantly affect the fresh weight and water content of the whole plant. However, red light significantly increased the hypocotyl length and edible rate by 56.64% and 8.75%, respectively. All types of red and blue light treatments promoted the accumulation of soluble sugars and proteins as compared to CK. Soluble sugar content under R3B1 treatment increased by 91.31%, and soluble protein content under B treatment increased by 22.75%. However, all red and blue light treatments resulted in 6.11–31.11% reduction in vitamin C content. Monochromatic red or blue light significantly decreased chlorophyll and carotenoid contents, whereas their contents under mixed red–blue light treatments showed no significant alterations. All treatments significantly increased the content of total aliphatic glucosinolate, with blue light being the most effective. Correlation analysis revealed that blue light likely enhanced the accumulation of total aliphatic glucosinolate by inducing <i>MYB28</i> expression, which in turn upregulated the transcript levels of <i>CYP79F1</i>, <i>CYP83A1</i>, <i>UGT74B1</i>, and <i>ST5b</i>. In conclusion, optimization of the red-to-blue light ratio can help to precisely regulate growth, morphology, nutritional quality, and accumulation of functional components during the production of broccoli microgreens.</p>

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Effects of Red and Blue LED Light on Growth and Bioactive Contents of Broccoli Microgreens

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Mengwei Chen,
  • Jing Liang,
  • Xu Liang,
  • Yingzi Xu,
  • Chenglei Zhang,
  • Daogen He,
  • Yongdong Xie

摘要

Light is a key environmental factor regulating plant growth, development, and accumulation of primary and secondary metabolites. Broccoli microgreens represent a Brassicaceae variety with a high market share, characterized by high nutrient density, strong environmental adaptability, and promising market returns, thus offering both substantial health benefits and economic value in cultivation. However, the effects of different red-to-blue light ratios on broccoli microgreens are largely unexplored. In this study, white light (CK) was used as a control to explore the effects of red (R), blue (B), and red–blue mixed (R5B1, R3B1, and R1B1) lights on the growth and bioactive compound content in broccoli microgreens. Treatment with different red and blue lights did not significantly affect the fresh weight and water content of the whole plant. However, red light significantly increased the hypocotyl length and edible rate by 56.64% and 8.75%, respectively. All types of red and blue light treatments promoted the accumulation of soluble sugars and proteins as compared to CK. Soluble sugar content under R3B1 treatment increased by 91.31%, and soluble protein content under B treatment increased by 22.75%. However, all red and blue light treatments resulted in 6.11–31.11% reduction in vitamin C content. Monochromatic red or blue light significantly decreased chlorophyll and carotenoid contents, whereas their contents under mixed red–blue light treatments showed no significant alterations. All treatments significantly increased the content of total aliphatic glucosinolate, with blue light being the most effective. Correlation analysis revealed that blue light likely enhanced the accumulation of total aliphatic glucosinolate by inducing MYB28 expression, which in turn upregulated the transcript levels of CYP79F1, CYP83A1, UGT74B1, and ST5b. In conclusion, optimization of the red-to-blue light ratio can help to precisely regulate growth, morphology, nutritional quality, and accumulation of functional components during the production of broccoli microgreens.