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<p>Phytoremediation is essential for removing heavy metals from soil, but there is still a need to enhance the application of this green technology from remediation efficiency and economic benefits. The study involved <i>Plectranthus tomentosa</i> (<i>P. tomentosa</i>), an aromatic plant, was planted in three types of chromium-contaminated soil (1800&#xa0;mg/kg (T1), 2300&#xa0;mg/kg (T2), 3100&#xa0;mg/kg (T3)) to examine plant’s potential and economic advantages. Results showed that all plants of <i>P. tomentosa</i> survived in T1, T2 and T3, plant height and growth biomass (fresh leaf weight, the ratio of dried weight to fresh weight, chlorophyll content) was the highest, but RSR was the lowest in T1. With the increasing content of Cr in soil, malondialdehyde content increased, meanwhile, total soluble sugar content and superoxide dismutase activity increased, but water content decreased. Compared to that before cultivating <i>P. tomentosa</i>, total Cr content decreased by 6.74% in T1, 19.78% in T2 and 10.43% in T3, respectively. Total Cr content was mainly accumulated in root, and bioconcentration factor of root reached 0.11, but translocation factor from root to aerial parts was only 0.51 in T3. Essential oil from fresh leaf reached 2.46 ~ 48.39&#xa0;mg/g. All findings indicate that <i>P. tomentosa</i> is a suitable plant with high growth biomass but non hyperaccumulator applied to phytoremediation for Cr-contaminated soil.</p>

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Phytoremediation of Cr-Contaminated Soil by Plectranthus tomentosa: Prospects and Limitations

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Xiaoru Chen,
  • Yanqi Zhou,
  • Ying Feng,
  • Mengtang Zhang

摘要

Phytoremediation is essential for removing heavy metals from soil, but there is still a need to enhance the application of this green technology from remediation efficiency and economic benefits. The study involved Plectranthus tomentosa (P. tomentosa), an aromatic plant, was planted in three types of chromium-contaminated soil (1800 mg/kg (T1), 2300 mg/kg (T2), 3100 mg/kg (T3)) to examine plant’s potential and economic advantages. Results showed that all plants of P. tomentosa survived in T1, T2 and T3, plant height and growth biomass (fresh leaf weight, the ratio of dried weight to fresh weight, chlorophyll content) was the highest, but RSR was the lowest in T1. With the increasing content of Cr in soil, malondialdehyde content increased, meanwhile, total soluble sugar content and superoxide dismutase activity increased, but water content decreased. Compared to that before cultivating P. tomentosa, total Cr content decreased by 6.74% in T1, 19.78% in T2 and 10.43% in T3, respectively. Total Cr content was mainly accumulated in root, and bioconcentration factor of root reached 0.11, but translocation factor from root to aerial parts was only 0.51 in T3. Essential oil from fresh leaf reached 2.46 ~ 48.39 mg/g. All findings indicate that P. tomentosa is a suitable plant with high growth biomass but non hyperaccumulator applied to phytoremediation for Cr-contaminated soil.