Biessy, Adrien; Ciotola, Marie; Cadieux, Mélanie; Deshaies, Arianne; Zboralski, Antoine; Khun, Kosal; Lafond-Lapalme, Joel; Vigneault, Philippe et Filion, Martin (2025). Interplay between nitrogen fertilization and plant growth-promoting rhizobacteria impacts lettuce growth under field conditions Plant and Soil , vol. ahead prin . pp. 1-17. DOI: 10.1007/s11104-025-07742-7.
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Background and aims: In the global context of reducing the use of synthetic fertilizers, it is crucial to explore solutions that may help minimizing yield losses associated with lower nitrogen fertilizer application regimes. In this study, we explored the potential of using two plant-beneficial rhizobacteria, Pseudomonas protegens B21-024 and Bacillus pumilus LBUM494, alone and in combination, to promote the growth of field-grown lettuce plants under varying nitrogen fertilization conditions.
Methods: We carried out a field experiment exploring the plant growth promotion ability of these two bacterial strains, alone and in combination, under three nitrogen fertilizer application regimes (recommended application dose, 50% reduction and 75% reduction). Lettuce growth and aboveground biomass accumulation were monitored weekly throughout the growing season using manual harvesting and unmanned aerial vehicle imaging. Leaf macronutrients content was also analyzed at harvest.
Results: P. protegens B21-024 and B. pumilus LBUM494, alone and in combination, promoted plant growth under all three nitrogen fertilization regimes. However, inoculation with P. protegens B21-024 was the only treatment able to compensate for yield losses associated with lower nitrogen fertilizer applications. The microbial consortium composed of the two bacterial strains was less effective than the two strains inoculated alone under the lowest nitrogen fertilizer application regime.
Conclusion: This study demonstrates the potential of using P. protegens B21-024 to promote lettuce growth under field conditions, especially under reduced nitrogen fertilizer regimes.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | Plant growth-promoting rhizobacteria; Pseudomonas protegens; Bacillus pumilus; Nitrogen fertilizer; Field experiment; Nitrogen leaf content |
| Centre: | Centre INRS-Institut Armand Frappier |
| Date de dépôt: | 04 juin 2026 15:09 |
| Dernière modification: | 04 juin 2026 15:09 |
| URI: | https://espace.inrs.ca/id/eprint/16638 |
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