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<p>The plant rhizosphere harbors diverse microorganisms, including strains capable of volatile organic compound (VOC) uptake and air purification. This study isolated <i>Lysinibacillus sp.</i> LL4-1, a high-efficiency formaldehyde-degrading bacterium, from the root system of <i>Epipremnum aureum</i> (<i>E. aureum</i>) pre-treated with formaldehyde solution. The Gram-positive, rod-shaped, non-sporulating strain (1000 × 310&#xa0;nm) demonstrated optimal degradation at pH 7.0, 35&#xa0;°C, and 150&#xa0;rpm agitation. Under these conditions, LL4-1 completely metabolized formaldehyde (50–1200&#xa0;mg/L) in aqueous solutions, with biomass (OD600) increasing proportionally to formaldehyde concentration, peaking at 1.4 for 1200&#xa0;mg/L at 22&#xa0;h. When applied as a suspension (OD600 = 0.8) to potted plants <i>E. aureum</i>, <i>Chlorophytum comosum</i> (<i>C. comosum</i>), and <i>Dracaena trifasciata</i> (<i>D. trifasciata</i>), gaseous formaldehyde (5&#xa0;ppm) removal efficiency significantly improved, particularly in <i>C. comosum</i> (daytime: 27.8 ± 2.03%; nighttime: 16.67% ± 2.52% enhancement). These findings indicate LL4-1’s dual capacity for efficient formaldehyde degradation in both aqueous and atmospheric phases, with successful application to phylloplane in host and non-host plants, suggesting promising applications for microbe-plant integrated air remediation systems.</p> Graphical abstract <p></p>

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Isolation of Lysinibacillus sp. LL4-1 from plant rhizosphere and synergistic application with plants for formaldehyde indoors removal

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Jiaochan Zhong,
  • Qianying Tu,
  • Ming Tang,
  • Shifan Pang,
  • Kangpeng He,
  • Hang Yang,
  • Chunjuan Xie,
  • Jian Li

摘要

The plant rhizosphere harbors diverse microorganisms, including strains capable of volatile organic compound (VOC) uptake and air purification. This study isolated Lysinibacillus sp. LL4-1, a high-efficiency formaldehyde-degrading bacterium, from the root system of Epipremnum aureum (E. aureum) pre-treated with formaldehyde solution. The Gram-positive, rod-shaped, non-sporulating strain (1000 × 310 nm) demonstrated optimal degradation at pH 7.0, 35 °C, and 150 rpm agitation. Under these conditions, LL4-1 completely metabolized formaldehyde (50–1200 mg/L) in aqueous solutions, with biomass (OD600) increasing proportionally to formaldehyde concentration, peaking at 1.4 for 1200 mg/L at 22 h. When applied as a suspension (OD600 = 0.8) to potted plants E. aureum, Chlorophytum comosum (C. comosum), and Dracaena trifasciata (D. trifasciata), gaseous formaldehyde (5 ppm) removal efficiency significantly improved, particularly in C. comosum (daytime: 27.8 ± 2.03%; nighttime: 16.67% ± 2.52% enhancement). These findings indicate LL4-1’s dual capacity for efficient formaldehyde degradation in both aqueous and atmospheric phases, with successful application to phylloplane in host and non-host plants, suggesting promising applications for microbe-plant integrated air remediation systems.

Graphical abstract