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Background <p>Rhizosphere microorganisms can improve soil quality, promote plant growth, and enhance plant health. Despite the isolation of numerous plant growth-promoting rhizobacteria (PGPR) strains, research on how PGPR enhances walnut growth remains limited.</p> Results <p>In this study, the metagenomic sequencing of the rhizosphere soil in 8 major walnut-producing areas in China was conducted to identify 150 shared core amplicon sequence variants. Then, we isolated a strain of <i>Bacillus cereus</i> OTU8977 from the walnut rhizosphere soil and evaluated its potential plant growth-promoting functions. <i>B. cereus</i> OTU8977 can optimize the walnut rhizosphere microecology and promote its growth through its considerable potential in nitrogen fixation, phosphorus solubilization, and potassium dissolution. Transcriptomic analysis of walnut roots revealed that <i>B. cereus</i> OTU8977 promotes the growth of walnuts by enhancing phenylpropanoid biosynthesis and carbohydrate metabolic processes.</p> Conclusions <p>This study identified a strain of <i>Bacillus cereus</i> with multiple plant growth-promoting functions, which significantly enhanced walnut growth. Moreover, the study further elucidated the mechanisms underlying its growth-promoting effects, providing a theoretical foundation for the development of walnut-specific microbial fertilizers.</p>

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Metagenomic analysis reveals Bacillus cereus OTU8977 as a potential probiotic in promoting walnut growth

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月2日

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  • Changxi Wang,
  • Weichen Song,
  • Chunyu Li,
  • Yiran Cao,
  • Xichen Li,
  • Jing Zhao,
  • Fei Yang,
  • Haiyi Yu,
  • Qiang Liang,
  • Ke Qiang Yang,
  • Jian Ning Liu,
  • Hongcheng Fang

摘要

Background

Rhizosphere microorganisms can improve soil quality, promote plant growth, and enhance plant health. Despite the isolation of numerous plant growth-promoting rhizobacteria (PGPR) strains, research on how PGPR enhances walnut growth remains limited.

Results

In this study, the metagenomic sequencing of the rhizosphere soil in 8 major walnut-producing areas in China was conducted to identify 150 shared core amplicon sequence variants. Then, we isolated a strain of Bacillus cereus OTU8977 from the walnut rhizosphere soil and evaluated its potential plant growth-promoting functions. B. cereus OTU8977 can optimize the walnut rhizosphere microecology and promote its growth through its considerable potential in nitrogen fixation, phosphorus solubilization, and potassium dissolution. Transcriptomic analysis of walnut roots revealed that B. cereus OTU8977 promotes the growth of walnuts by enhancing phenylpropanoid biosynthesis and carbohydrate metabolic processes.

Conclusions

This study identified a strain of Bacillus cereus with multiple plant growth-promoting functions, which significantly enhanced walnut growth. Moreover, the study further elucidated the mechanisms underlying its growth-promoting effects, providing a theoretical foundation for the development of walnut-specific microbial fertilizers.