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Arthrobacter nicotinovorans EAPAA enhances must attributes: evidence from Spanish and Portuguese case studies
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Background: Mediterranean agriculture faces severe challenges from soil degradation and water scarcity, intensified climate change, and unsustainable practices, like the overuse of chemicals. These pressures drive biodiversity loss, soil erosion, and declining crop productivity, threatening food security and farming’s long-term viability. Enhancing resilience in agri-food systems requires the combination of sustainable agronomic practices and innovative biotechnological solutions. Among these, the use of plant-growth-promoting bacteria (PGPB) is a currently sought strategy to support crop performance. Despite their proven benefits under controlled conditions, it is essential to widen the assessment of PGPB robustness and stability in real-world situations. Methods: Two case studies in Ribeiro (Spain) and Douro (Portugal) evaluated the effects of Arthrobacter nicotinovorans EAPAA inoculation on grapevine (Vitis vinifera L.), focusing on must quality and soil properties. The strain EAPAA has been shown to enhance P solubilization and N2 fixation. Field trials covered an average area of 300 m2 in Spain and 600 m2 in Portugal. Results: Must composition analysis show that inoculation significantly affected sugars and organic acid levels in both sites. In Spain, inoculation increased glucose and fructose by 18% and 31%, respectively; tartaric and malic acid by 17.5% and 9.2%, respectively, and succinic acid by 29.8%- 71.3%, alongside higher soil P available, labile C compounds, and biological activity. In Portugal, sugars increased by 33% and tartaric and malic acids by 50%, improvements that directly influence the quality of the wine. Conclusion: This study demonstrates the adaptability of A. nicotinovorans EAPAA and its beneficial effects on both must quality and soil health.
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Sousa, A. S. D. S., Prieto Fernández, Á., Trasar-Cepeda, C., & Castro, P. et al. (2025). Arthrobacter nicotinovorans EAPAA enhances must attributes: evidence from Spanish and Portuguese case studies. 197-197. Abstract from Microbiotec’25, Ponta Delgada, Portugal.