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<p>This study examined the interactive effects of green light proportion and photosynthetic photon flux density (PPFD) on the growth and morphology of coleus (<i>Plectranthus scutellarioides</i> ‘Premium Sun Watermelon’). Plants were grown under three red: green: blue (R: G:B) light spectra (60:0:40, 45:25:30, 30:50:20) at two PPFD levels (150 and 250 µmol m⁻² s⁻¹). Both green light proportion and light intensity significantly affected plant height, internode length, petiole length, and related traits. At low PPFD, increasing green light suppressed elongation, while at high PPFD it promoted elongation, likely due to shade-avoidance-like, PPFD-dependent responses. Petiole length increased under low light, indicating adaptation to reduced irradiance. Stem diameter was greatest under high blue and low green light at 150 µmol m⁻² s⁻¹. Biomass, leaf number, and dry weight improved significantly under high PPFD regardless of light quality. These results highlight that green light’s effect on elongation depends on light intensity and that higher PPFD enhances coleus growth and productivity. This study offers insight into spectral manipulation for optimizing ornamental plant growth in controlled environments.</p>

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Interactive effects of green light proportion and light intensity on the morphology of Plectranthus scutellarioides ‘Premium Sun Watermelon’

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Jayathissa Arachchilage Udani Manodya,
  • Jeongmin Park,
  • Minso Kim,
  • Bohyun Sung,
  • Young-Yeol Cho,
  • Youngtaek Baek,
  • Wook Oh

摘要

This study examined the interactive effects of green light proportion and photosynthetic photon flux density (PPFD) on the growth and morphology of coleus (Plectranthus scutellarioides ‘Premium Sun Watermelon’). Plants were grown under three red: green: blue (R: G:B) light spectra (60:0:40, 45:25:30, 30:50:20) at two PPFD levels (150 and 250 µmol m⁻² s⁻¹). Both green light proportion and light intensity significantly affected plant height, internode length, petiole length, and related traits. At low PPFD, increasing green light suppressed elongation, while at high PPFD it promoted elongation, likely due to shade-avoidance-like, PPFD-dependent responses. Petiole length increased under low light, indicating adaptation to reduced irradiance. Stem diameter was greatest under high blue and low green light at 150 µmol m⁻² s⁻¹. Biomass, leaf number, and dry weight improved significantly under high PPFD regardless of light quality. These results highlight that green light’s effect on elongation depends on light intensity and that higher PPFD enhances coleus growth and productivity. This study offers insight into spectral manipulation for optimizing ornamental plant growth in controlled environments.