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Background and Aims <p>Soybean (<i>Glycine max</i> (<i>L.</i>) <i>Merr</i>.) is a crucial food crop in northeastern China. However, the excessive use of the herbicide acetochlor poses significant risks to soil health and ecological systems. This study aimed to identify soybean cultivars that can enhance acetochlor removal and analyze the underlying bioremediation mechanisms.</p> Methods <p>We assessed the acetochlor removal efficiency of fourteen soybean cultivars, selecting two high-efficiency cultivars (H-soybean: JY100 and HN54) and two low-efficiency cultivars (L-soybean: SYD1 and HN48) for further investigation. Field studies assessed their performance in acetochlor-contaminated agricultural soil.</p> Results <p>H-soybean cultivars demonstrated significantly higher acetochlor removal efficiencies of 85.0% and 94.7%, while L-soybean cultivars exhibited 44.8% and 30.9% after 17&#xa0;days. The variation in remediation efficiency was attributed to distinct rhizosphere bacterial communities associated with each cultivar. Cultivars with similar remediation efficiencies possessed analogous microbial communities. Notable acetochlor-degrading genera, including <i>Sphingomonas</i>, <i>Bradyrhizobium</i>, <i>Massilia</i>, <i>Nocardioides, Gemmatimonas</i> and unclassified Comamonadaceae<i>,</i> were enriched in acetochlor-treated soil, with <i>Sphingomonas</i> being particularly abundant in the SH treatment. Additionally, the key genes <i>cmeH</i>, <i>alkB</i> and <i>benA</i> involved in the upstream pathway of acetochlor degradation especially increased in H-soybean under acetochlor-treated soil. Moreover, H-cultivar exhibits a simpler and more stable network structure while facilitating more efficient information and resource transfer within the network compared to the L-cultivars and recruiting key taxa associated with acetochlor degradation.</p> Conclusions <p>These findings highlight the potential of H-soybean cultivars and their associated microbiomes for the phytoremediation of acetochlor-contaminated soils.</p>

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Soybean Cultivar-Dependent Rhizosphere Microbial Communities Facilitate Acetochlor Removal in Agricultural Soils

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Qingling Wang,
  • Liulin Yang,
  • Jinyu Hou,
  • Yongnan Zhai,
  • Xiongxiong Wang,
  • Wuxing Liu

摘要

Background and Aims

Soybean (Glycine max (L.) Merr.) is a crucial food crop in northeastern China. However, the excessive use of the herbicide acetochlor poses significant risks to soil health and ecological systems. This study aimed to identify soybean cultivars that can enhance acetochlor removal and analyze the underlying bioremediation mechanisms.

Methods

We assessed the acetochlor removal efficiency of fourteen soybean cultivars, selecting two high-efficiency cultivars (H-soybean: JY100 and HN54) and two low-efficiency cultivars (L-soybean: SYD1 and HN48) for further investigation. Field studies assessed their performance in acetochlor-contaminated agricultural soil.

Results

H-soybean cultivars demonstrated significantly higher acetochlor removal efficiencies of 85.0% and 94.7%, while L-soybean cultivars exhibited 44.8% and 30.9% after 17 days. The variation in remediation efficiency was attributed to distinct rhizosphere bacterial communities associated with each cultivar. Cultivars with similar remediation efficiencies possessed analogous microbial communities. Notable acetochlor-degrading genera, including Sphingomonas, Bradyrhizobium, Massilia, Nocardioides, Gemmatimonas and unclassified Comamonadaceae, were enriched in acetochlor-treated soil, with Sphingomonas being particularly abundant in the SH treatment. Additionally, the key genes cmeH, alkB and benA involved in the upstream pathway of acetochlor degradation especially increased in H-soybean under acetochlor-treated soil. Moreover, H-cultivar exhibits a simpler and more stable network structure while facilitating more efficient information and resource transfer within the network compared to the L-cultivars and recruiting key taxa associated with acetochlor degradation.

Conclusions

These findings highlight the potential of H-soybean cultivars and their associated microbiomes for the phytoremediation of acetochlor-contaminated soils.