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ORIGINAL RESEARCH article

Front. Microbiol.

Sec. Microbe and Virus Interactions with Plants

Volume 16 - 2025 | doi: 10.3389/fmicb.2025.1676616

This article is part of the Research TopicDeciphering the Ecological and Molecular Dynamics of Free-living Nitrogen FixersView all articles

Engineering Nitrogen-Fixing Microbiomes with Waste-Derived Carbon Sources: Toward Circular and Resilient Biofertilizer Solution

Provisionally accepted
Nicolás  Rodríguez-RomeroNicolás Rodríguez-Romero1,2Juan  Carlos Clavijo-SalinasJuan Carlos Clavijo-Salinas2Julien  WistJulien Wist2,3Carlos  GutierrezCarlos Gutierrez2Daniel  Uribe-VelezDaniel Uribe-Velez1Elaine  HolmesElaine Holmes3,4,5Janeth  SanabriaJaneth Sanabria3*
  • 1Universidad Nacional de Colombia Instituto de Biotecnologia, Bogotá, Colombia
  • 2Universidad del Valle, Cali, Colombia
  • 3Murdoch University Australian National Phenome Centre, Murdoch, Australia
  • 4Imperial College London Faculty of Medicine, London, United Kingdom
  • 5Imperial College London Institute of Global Health Innovation, London, United Kingdom

The final, formatted version of the article will be published soon.

Microbiome engineering has emerged as a promising strategy to drive biotechnological developments across diverse fields. Microbiome-based fertilizers could significantly contribute to the gradual replacement of synthetic chemical fertilizers, potentially leading to substantial environmental and economic impacts. This study employed microbiome engineering to develop a self-assembled nitrogen-fixing microbial community utilizing carbon compounds from animal waste. This was achieved by enriching soil samples in bioreactors supplied with nitrogen via air pumping and fed with volatile fatty acids (VFAs) as the only carbon source. VFAs are the most common by-products of anaerobic waste fermentation. Results show a self-assembled community, dominated by Sinirhodobacter spp. (44.4%), Aureimonas spp. (17.7%), and Taibaiella spp. (12.4%), capable of fixing 2.7 times more nitrogen than the initial microbiome. During cultivation, inorganic nitrogen forms were detected in the supernatant at concentrations of up to 12.7 mg·L⁻¹. Once the self-assembled community was inoculated in tomato plants, Pseudomonas spp. and Exiguobacterium spp. became the most abundant and significantly enhanced tomato plant growth in both hydroponic and soil-based systems. Plant height and yield were comparable to those achieved with conventional synthetic nitrogen fertilizers. This study shows the potential of this methodology for developing effective biofertilizers while promoting a circular economy strategy that transforms waste into high-value bioproducts. This approach, combined with the simplicity of the bioreactor system, offers a viable and sustainable solution for developing countries with limited technological resources, and materializes the One Health vision while simultaneously protecting the health of people, crops, and animals.

Keywords: bioeconomy, Waste valorization, targeted bioprospecting, self-assembled community, Nitrogen

Received: 30 Jul 2025; Accepted: 01 Sep 2025.

Copyright: © 2025 Rodríguez-Romero, Clavijo-Salinas, Wist, Gutierrez, Uribe-Velez, Holmes and Sanabria. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Janeth Sanabria, Murdoch University Australian National Phenome Centre, Murdoch, Australia

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