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Background and aims <p><i>Streptomyces</i> spp., known for its biocontrol capacity and enzyme production, is an important bacterium in soil nutrient cycling, yet the synergistic effects of organic fertilizer with <i>Streptomyces</i> inoculants on soil fertility enhancement and microbial community restructuring remain poorly characterized.</p> Methods <p>The effects of organic fertilizer with plant growth promoting <i>Streptomyces</i> sp. GS7 on the soil physicochemical properties and microbiome structure. The soil enzyme activities, microbial communities, and lettuce yield in pots experiments were also analyzed under four treatments, chemical fertilizer (CF), CF with <i>Streptomyces</i> GS7 (CFS), organic fertilizer (OF), and OF with <i>Streptomyces</i> GS7 (OFS).</p> Results <p>It was indicated that OF/OFS application increase soil organic matter, total nitrogen and humus contents (<i>P</i> &lt; 0.05). Simultaneously, higher diversity of soil bacterial community was found in OF/OFS. The diversities of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in OF/OFS were also higher than CF/CFS, and the addition of GS7 could also increase AOA diversity but decreased AOB diversity. The main AOAs of <i>Nitrososphaera</i> were present in all fertilized soils and were significant correlated with available nitrogen and soil enzymes.</p> Conclusion <p>The application of OF/OFS can enhance soil fertility and bacterial diversity, and the addition <i>Streptomyces</i> sp. GS7 increased the relative abundance of AOA. The results highlight the positive impact of <i>Streptomyces</i> sp. GS7 addition in OF, enhancing soil nutrients, enzyme activities, and reshaping microbial communities of this pot experiment of lettuce.</p> Graphical Abstract <p></p>

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Synergistic enhancement of soil fertility and microbial community structure by organic fertilizer combined with Streptomyces sp. GS7 inoculation in lettuce cultivation

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Qianqian Chen,
  • Yijin Gao,
  • Mingkuang Wang

摘要

Background and aims

Streptomyces spp., known for its biocontrol capacity and enzyme production, is an important bacterium in soil nutrient cycling, yet the synergistic effects of organic fertilizer with Streptomyces inoculants on soil fertility enhancement and microbial community restructuring remain poorly characterized.

Methods

The effects of organic fertilizer with plant growth promoting Streptomyces sp. GS7 on the soil physicochemical properties and microbiome structure. The soil enzyme activities, microbial communities, and lettuce yield in pots experiments were also analyzed under four treatments, chemical fertilizer (CF), CF with Streptomyces GS7 (CFS), organic fertilizer (OF), and OF with Streptomyces GS7 (OFS).

Results

It was indicated that OF/OFS application increase soil organic matter, total nitrogen and humus contents (P < 0.05). Simultaneously, higher diversity of soil bacterial community was found in OF/OFS. The diversities of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in OF/OFS were also higher than CF/CFS, and the addition of GS7 could also increase AOA diversity but decreased AOB diversity. The main AOAs of Nitrososphaera were present in all fertilized soils and were significant correlated with available nitrogen and soil enzymes.

Conclusion

The application of OF/OFS can enhance soil fertility and bacterial diversity, and the addition Streptomyces sp. GS7 increased the relative abundance of AOA. The results highlight the positive impact of Streptomyces sp. GS7 addition in OF, enhancing soil nutrients, enzyme activities, and reshaping microbial communities of this pot experiment of lettuce.

Graphical Abstract