Staged Microbial Consortium Valorizes Cattle Manure Wastewater and Promotes Maize Growth
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ID: 318540
2026
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Abstract
Abstract Aims Ammonia-oxidizing bacteria play important roles in nitrogen transformation and agricultural-waste valorization; however, their large-scale application is often limited by high cultivation costs and insufficient functional stability. This study aimed to develop a low-cost and stable microbial consortium for converting cattle manure wastewater into a bioactive fermentation broth and to investigate its underlying mechanisms. Methods and Results The heterotrophic ammonia-oxidizing bacterium Ensifer sp. S2-8-1 was used as the core strain, and Bacillus subtilis was employed as the auxiliary strain. Three cultivation systems were compared: S2-8-1 monoculture, simultaneous co-culture, and a staged consortium (SYC). Among them, SYC exhibited the best overall performance, maintaining the highest viable bacterial density and reaching 3.93 × 10⁷ CFU·mL⁻¹ on day 12. In a soil–maize pot experiment, SYC significantly enhanced rhizosphere nitrification, increased NO₃⁻-N availability, and promoted maize growth, resulting in a 41.4% increase in whole-plant dry matter compared with the water control. The consortium also improved photosynthetic performance and cytokinin accumulation. Comparative metatranscriptomic analysis revealed significant upregulation of heterotrophic ammonia oxidation-related genes (CYP450) and cytokinin-related genes (miaA and LOG) in S2-8-1 under SYC conditions, suggesting coordinated activation of nitrogen transformation and plant growth-promoting signaling pathways. Conclusions The staged “pre-modification followed by synergy” consortium effectively converts cattle manure wastewater into a stable and bioactive fermentation broth, enhancing both microbial biomass production and plant growth-promoting activity. This strategy provides a scalable approach for livestock wastewater valorization and the development of compound microbial fertilizers.
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| Authors | Xiaoling Wang, Jiawei Cao, Longkang Ni, H Zhao, Liju Zhou, Yue Wang |
| Journal | Journal of applied microbiology |
| Year | 2026 |
| DOI |
10.1093/jambio/lxag151
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| URL | |
| Keywords | Keywords not found |
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