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<p>This study evaluated the effects of varying red and blue (RB) light ratios on the growth, morphology, leaf coloration, and chlorophyll fluorescence parameters of coleus (<i>Plectranthus scutellarioides</i>) ‘Premium Sun Watermelon’ cultivar under controlled environment conditions. Five RB ratios (10:0-control, 9:1, 8:2, 7:3, and 6:4) were tested. Morphological parameters, colorimetric indices (L, a, b), leaf area coloration, and chlorophyll fluorescence traits (Fv/Fm, Pi_Abs, ABS/RC, DIo/RC) were recorded. The 10:0 treatment produced the tallest plants, fewer branches, while higher blue light ratios (7:3, 6:4) led to shorter plants and thinner stems. Notably, the 6:4 treatment exhibited the highest Pi_Abs (25.01) and the lowest DIo/RC (0.19) and enhanced red pigmentation and brightness (higher a*, L* values), thereby improving ornamental quality. Although excessive blue light reduced plant height and total biomass due to limited light interception, the 6:4 ratio achieved a favorable balance between aesthetic value and physiological performance. These findings underscore the significance of spectral optimization for achieving high-quality coleus production in controlled environments.</p>

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Effect of controlled red and blue LED light ratios on growth, morphology, leaf coloration, and chlorophyll fluorescence in coleus (Plectranthus scutellarioides)

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Jayathissa Arachchilage Udani Manodya,
  • Jeongmin Park,
  • Minso Kim,
  • Nayoung Kwak,
  • Jiwook Lee,
  • Yujin Yang,
  • Seungwon Kang,
  • Wook Oh

摘要

This study evaluated the effects of varying red and blue (RB) light ratios on the growth, morphology, leaf coloration, and chlorophyll fluorescence parameters of coleus (Plectranthus scutellarioides) ‘Premium Sun Watermelon’ cultivar under controlled environment conditions. Five RB ratios (10:0-control, 9:1, 8:2, 7:3, and 6:4) were tested. Morphological parameters, colorimetric indices (L, a, b), leaf area coloration, and chlorophyll fluorescence traits (Fv/Fm, Pi_Abs, ABS/RC, DIo/RC) were recorded. The 10:0 treatment produced the tallest plants, fewer branches, while higher blue light ratios (7:3, 6:4) led to shorter plants and thinner stems. Notably, the 6:4 treatment exhibited the highest Pi_Abs (25.01) and the lowest DIo/RC (0.19) and enhanced red pigmentation and brightness (higher a*, L* values), thereby improving ornamental quality. Although excessive blue light reduced plant height and total biomass due to limited light interception, the 6:4 ratio achieved a favorable balance between aesthetic value and physiological performance. These findings underscore the significance of spectral optimization for achieving high-quality coleus production in controlled environments.