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Aims <p>Biofertilizers are a promising amendment for improving calcareous soils; however, the comparative efficacy of a specific indigenous <i>Trichoderma</i> biofertilizer compared with a prevalent <i>Trichoderma</i> commercial biofertilizer, and their impact on native soil communities, remain poorly understood.</p> Methods <p>Three indigenous <i>Trichoderma</i> strains (TB2, TB3, and TB5) were isolated from the pear rhizosphere in calcareous soil and identified as <i>T. brevicompactum</i>. Plant growth-promoting traits (IAA and siderophore synthesis) were quantified using in vitro assays and were validated in greenhouse trials. The field experiments employed a randomized block design with five treatments: organic fertilizer (CK), commercial <i>Trichoderma</i> biofertilizer (OF), and three biofertilizers based on indigenous <i>Trichoderma</i> strains (TB2, TB3, TB5). Soil physio-chemical properties, fruit quality indices, and rhizosphere microbial communities were analyzed.</p> Results <p>All three indigenous <i>Trichoderma</i> strains were capable of producing siderophores and auxins, and significantly enhanced pear seedling growth in calcareous soil. Field trials demonstrated that TB2 significantly improved fruit quality compared to OF. TB2 reshaped bacterial and fungal communities, increasing the number of keystone taxa (Gemmatimonadetes, Mortierellomycota, Chytridiomycota). Bacterial-fungal co-occurrence networks revealed five modules. Module 1 (positively linked to fruit quality) was enriched by TB2 via key ASV7 (fungal) and ASV3113 (bacterial) taxa.</p> Conclusion <p>The TB2-based biofertilizer exhibited benefits for improving fruit quality as a potential strategy for microbiome engineering for sustainable crop production in calcareous soils and similar marginal agricultural ecosystems.</p>

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Indigenous Trichoderma-based biofertilizer reshapes the pear rhizosphere microbiome for enhancing fruit quality under calcareous soil

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Zuohereguli Kuerban,
  • Rou jiang,
  • Yanwei Ma,
  • Sidong Li,
  • Peigen Li,
  • Liping Kan,
  • Caixia Dong,
  • Yangchun Xu,
  • Qirong Shen

摘要

Aims

Biofertilizers are a promising amendment for improving calcareous soils; however, the comparative efficacy of a specific indigenous Trichoderma biofertilizer compared with a prevalent Trichoderma commercial biofertilizer, and their impact on native soil communities, remain poorly understood.

Methods

Three indigenous Trichoderma strains (TB2, TB3, and TB5) were isolated from the pear rhizosphere in calcareous soil and identified as T. brevicompactum. Plant growth-promoting traits (IAA and siderophore synthesis) were quantified using in vitro assays and were validated in greenhouse trials. The field experiments employed a randomized block design with five treatments: organic fertilizer (CK), commercial Trichoderma biofertilizer (OF), and three biofertilizers based on indigenous Trichoderma strains (TB2, TB3, TB5). Soil physio-chemical properties, fruit quality indices, and rhizosphere microbial communities were analyzed.

Results

All three indigenous Trichoderma strains were capable of producing siderophores and auxins, and significantly enhanced pear seedling growth in calcareous soil. Field trials demonstrated that TB2 significantly improved fruit quality compared to OF. TB2 reshaped bacterial and fungal communities, increasing the number of keystone taxa (Gemmatimonadetes, Mortierellomycota, Chytridiomycota). Bacterial-fungal co-occurrence networks revealed five modules. Module 1 (positively linked to fruit quality) was enriched by TB2 via key ASV7 (fungal) and ASV3113 (bacterial) taxa.

Conclusion

The TB2-based biofertilizer exhibited benefits for improving fruit quality as a potential strategy for microbiome engineering for sustainable crop production in calcareous soils and similar marginal agricultural ecosystems.