In the context of agroecological sustainability, this paper analyses the role of soil microorganisms as critical providers of ecosystem services in the absence of conventional chemical inputs. Bacteria and fungi govern the productivity of agricultural systems through fundamental biogeochemical processes, such as biological nitrogen fixation, solubilization of phosphorus and sequestration of atmospheric carbon in stable humus fractions. The resilience of the agroecosystems is supported by high-precision microbial mechanisms: arbuscular mycorrhizal fungi structure the edaphic matrix through the production of glomalin, a hydrophobic glycoprotein essential for aggregate stability and soil structural stability, while bacteria from the plant growth promotion group regulate plant physiological homeostasis through complex hormonal modulation. A central role in mitigating abiotic stress is played by the activity of the enzyme ACC-deaminase, which functions as a metabolic drain for the ethylene precursor, preventing the inhibition of root growth under drought or salinity stress. The novelty of the current research lies in the conceptual transition from inoculation with isolated strains to the assembly of complex microbial consortia. This microbial approach uses principles of functional complementarity and metabolic cross-feeding phenomena to ensure efficient rhizosphere flows and increased biofilm stability under natural field conditions. The integration of microbial complex consortia transforms soil management from an interventionist practice into a predictive and self-sustaining system, capable of optimizing ecosystem health and ensuring global food security.

Ecosystem Services, Stress Resilience, Synergy, Plant growth promotion

agronomy

Presentation: oral presentation