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Background <p>Using plant growth-promoting rhizobacteria (PGPR) combined with hyperaccumulator is an ecologically viable way to remediate cadmium (Cd) pollution in agricultural soil. Despite recent advances in elucidating PGPR-enhanced phytoremediation, the response of plant-associated microbiota to PGPR remains unclear.</p> Results <p>Here, we found that the effective colonization of PGPR reshaped the rhizosphere nutrient microenvironment, especially driving the nitrogen cycle, primarily mediated by soil nitrate reductase (S-NR). Elevated S-NR activity mobilized amino acid metabolism and synthesis pathways in the rhizosphere, subsequently driving a shift in life history strategies of the rhizosphere microbiota, and enriching specific rare taxa. The reconstructed synthetic community (SynCom3) confirmed that the inclusion of two crucial collaborators (<i>Lysobacter</i> and <i>Microbacterium</i>) could efficiently foster the colonization of PGPR and aid PGPR in executing phytoremediation enhancement. Finally, the multi-omics analysis highlighted the critical roles of phenylpropanoid biosynthesis and tryptophan metabolism pathways in inducing SynCom3 reorganization and PGPR-enhanced phytoremediation.</p> Conclusions <p>Our results underscore the significance of the rhizosphere microenvironment modification by PGPR for its colonization and efficacy, and highlight the collaborative role of rare microbiota in the context of PGPR-enhanced phytoremediation.</p> <p><MediaObject ID="MOESM2"> <VideoObject FileRef="MediaObjects/40168_2025_2113_MOESM2_ESM.mp4" VideoID="C2EXD-tFkSizBxTQQLWFPw"> <Caption Language="En" xml:lang="en"> <CaptionContent> <p>Video Abstract</p> </CaptionContent> </Caption> </VideoObject> </MediaObject></p>

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Nitrogen cycle induced by plant growth-promoting rhizobacteria drives “microbial partners” to enhance cadmium phytoremediation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月6日

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  • Yaowei Chi,
  • Xianzhong Ma,
  • Shaohua Chu,
  • Yimin You,
  • Xunfeng Chen,
  • Juncai Wang,
  • Renyuan Wang,
  • Xia Zhang,
  • Dongwei Zhang,
  • Ting Zhao,
  • Dan Zhang,
  • Pei Zhou

摘要

Background

Using plant growth-promoting rhizobacteria (PGPR) combined with hyperaccumulator is an ecologically viable way to remediate cadmium (Cd) pollution in agricultural soil. Despite recent advances in elucidating PGPR-enhanced phytoremediation, the response of plant-associated microbiota to PGPR remains unclear.

Results

Here, we found that the effective colonization of PGPR reshaped the rhizosphere nutrient microenvironment, especially driving the nitrogen cycle, primarily mediated by soil nitrate reductase (S-NR). Elevated S-NR activity mobilized amino acid metabolism and synthesis pathways in the rhizosphere, subsequently driving a shift in life history strategies of the rhizosphere microbiota, and enriching specific rare taxa. The reconstructed synthetic community (SynCom3) confirmed that the inclusion of two crucial collaborators (Lysobacter and Microbacterium) could efficiently foster the colonization of PGPR and aid PGPR in executing phytoremediation enhancement. Finally, the multi-omics analysis highlighted the critical roles of phenylpropanoid biosynthesis and tryptophan metabolism pathways in inducing SynCom3 reorganization and PGPR-enhanced phytoremediation.

Conclusions

Our results underscore the significance of the rhizosphere microenvironment modification by PGPR for its colonization and efficacy, and highlight the collaborative role of rare microbiota in the context of PGPR-enhanced phytoremediation.

Video Abstract