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<p>The safe use of farmland contaminated with multiple metals is crucial for ensuring the safety of agricultural products.&#xa0;The application potential of <i>Ageratum conyzoides</i> L. in remediating heavy metal-contaminated soil was systematically assessed through an intercropping experiment with maize, taking into account the cadmium (Cd) and lead (Pb) pollution in farmland.&#xa0;Compared to monoculture condition, the Cd content in roots of maize was significantly reduced by 66.57% (<i>P</i> &lt; 0.05), and there was no significant difference in Cd content across various tissues of <i>Ageratum conyzoides</i> L. The Pb content in <i>Ageratum conyzoides</i> L. roots increased by 27.97%, while Cd and Pb concentrations in maize seeds decreased by 17.69% and 38.73%, respectively. The translocation factors of Cd and Pb in maize seeds were reduced by 58.71% and 31.22% (<i>P</i> &lt; 0.05). The total organic acid content in root exudates of <i>Ageratum conyzoides</i> L. and maize increased by 3.86% and 4.86%, respectively. Notably, the relative abundance of the <i>Burkholderia</i> and <i>Pseudomonas</i> genera, known to influence heavy metal uptake, accumulation, and translocation, increased by 1.41-fold and 1.09-fold in maize and by 2.62-fold in <i>Ageratum conyzoides</i> L. These microbial shifts, combined with enhanced organic acid secretion, indicate a synergistic mechanism driving the intercropping system’s efficacy.&#xa0;Consequently, the intercropped system significantly reduced Cd and Pb concentrations in maize seeds while enhancing Pb accumulation in <i>Ageratum conyzoides</i> L. This approach demonstrates high potential for remediating agricultural soils contaminated with multiple heavy metals and producing safe crops.</p>

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Phytoremediation Potential of Ageratum Conyzoides L. Intercropped with Maize in Farmland Contaminated with Cadmium and Lead

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Guimei Qin,
  • Renzhi Xu,
  • Bo Song,
  • Deqian Chen,
  • Zhibo Liu

摘要

The safe use of farmland contaminated with multiple metals is crucial for ensuring the safety of agricultural products. The application potential of Ageratum conyzoides L. in remediating heavy metal-contaminated soil was systematically assessed through an intercropping experiment with maize, taking into account the cadmium (Cd) and lead (Pb) pollution in farmland. Compared to monoculture condition, the Cd content in roots of maize was significantly reduced by 66.57% (P < 0.05), and there was no significant difference in Cd content across various tissues of Ageratum conyzoides L. The Pb content in Ageratum conyzoides L. roots increased by 27.97%, while Cd and Pb concentrations in maize seeds decreased by 17.69% and 38.73%, respectively. The translocation factors of Cd and Pb in maize seeds were reduced by 58.71% and 31.22% (P < 0.05). The total organic acid content in root exudates of Ageratum conyzoides L. and maize increased by 3.86% and 4.86%, respectively. Notably, the relative abundance of the Burkholderia and Pseudomonas genera, known to influence heavy metal uptake, accumulation, and translocation, increased by 1.41-fold and 1.09-fold in maize and by 2.62-fold in Ageratum conyzoides L. These microbial shifts, combined with enhanced organic acid secretion, indicate a synergistic mechanism driving the intercropping system’s efficacy. Consequently, the intercropped system significantly reduced Cd and Pb concentrations in maize seeds while enhancing Pb accumulation in Ageratum conyzoides L. This approach demonstrates high potential for remediating agricultural soils contaminated with multiple heavy metals and producing safe crops.