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Background <p>Utilizing suitable rhizobacteria can efficiently limit Cd accumulation in crops or enhance phytoextraction by accumulators.</p> Methods <p>In this study, a new strain <i>Pseudomonas</i> sp. HYQ2 was isolated from Cd-contaminated rhizosphere soil. Its environmental adaptability, physiological characteristics, and effects on phytoextraction were thoroughly investigated.</p> Results <p>The <i>Pseudomonas</i> sp. HYQ2 strain demonstrated robust adaptability to Cd, pH, and temperature conditions. It also effectively produced indole-3-acetic acid (IAA) and siderophores and solubilized phosphorus (P) and potassium (K). Inoculating HYQ2 strain into the rhizosphere of <i>Phytolacca icosandra</i> L., resulting in a marked increase in Cd accumulation in both roots and shoots by 31.89% and 153.90%, respectively. This was attributed to the ability of HYQ2 strain to concurrently elevate the soil bioavailability of nitrogen, P, and Cd in the soil, while also boosting the levels of endogenous hormone (e.g., IAA, gibberellin, and zeatin) in plants. Additionally, HYQ2 inoculation significantly altered the rhizobacterial community composition, notably affecting several known plant growth-promoting rhizobacteria (e.g., <i>Lysobacter</i>, <i>Devosia</i>, <i>Bradyrhizobium</i>, <i>Flavobacterium</i>, <i>Rhodobacter</i>, and <i>Acidovorax</i>), suggesting potential ecological interactions. This hypothesis was partially validated by co-culture assays with <i>F. fluviale</i> SA6, which demonstrated enhanced bacterial proliferation and biofilm formation, indicating a synergistic interaction between the strains.</p> Conclusion <p>This study highlights the potential role of <i>Pseudomonas</i> sp. HYQ2 in enhancing Cd phytoextraction and offers valuable insights into the complex interactions between plant, rhizobacteria, and Cd.</p>

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Pseudomonas sp. HYQ2 enhances cadmium phytoextraction by Phytolacca icosandra L. through interacting with other plant growth-promoting rhizobacteria

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Yanshuang Li,
  • Jingya Yang,
  • Yingqi Huang,
  • Na Hu,
  • Xumei Huang,
  • Haisheng Tang,
  • Josy Karel Ngueuyim Nono,
  • Jianchu Xu,
  • Yishu Deng,
  • Xiong Li

摘要

Background

Utilizing suitable rhizobacteria can efficiently limit Cd accumulation in crops or enhance phytoextraction by accumulators.

Methods

In this study, a new strain Pseudomonas sp. HYQ2 was isolated from Cd-contaminated rhizosphere soil. Its environmental adaptability, physiological characteristics, and effects on phytoextraction were thoroughly investigated.

Results

The Pseudomonas sp. HYQ2 strain demonstrated robust adaptability to Cd, pH, and temperature conditions. It also effectively produced indole-3-acetic acid (IAA) and siderophores and solubilized phosphorus (P) and potassium (K). Inoculating HYQ2 strain into the rhizosphere of Phytolacca icosandra L., resulting in a marked increase in Cd accumulation in both roots and shoots by 31.89% and 153.90%, respectively. This was attributed to the ability of HYQ2 strain to concurrently elevate the soil bioavailability of nitrogen, P, and Cd in the soil, while also boosting the levels of endogenous hormone (e.g., IAA, gibberellin, and zeatin) in plants. Additionally, HYQ2 inoculation significantly altered the rhizobacterial community composition, notably affecting several known plant growth-promoting rhizobacteria (e.g., Lysobacter, Devosia, Bradyrhizobium, Flavobacterium, Rhodobacter, and Acidovorax), suggesting potential ecological interactions. This hypothesis was partially validated by co-culture assays with F. fluviale SA6, which demonstrated enhanced bacterial proliferation and biofilm formation, indicating a synergistic interaction between the strains.

Conclusion

This study highlights the potential role of Pseudomonas sp. HYQ2 in enhancing Cd phytoextraction and offers valuable insights into the complex interactions between plant, rhizobacteria, and Cd.