02697naa a2200289 a 450000100080000000500110000800800410001902200140006010000250007424501340009926000090023352018530024265000280209565000180212365000410214170000170218270000180219970000170221770000190223470000170225370000160227070000190228670000290230570000200233470000200235477300330237421828382025-12-16       2025    bl uuuu     u00u1 u    #d  a2073-43951 aSILVA, S. Y. A. M da  aEvidence of the role of plant growth-promoting bacteria in mitigating N2O emissions from maize cultivationh[electronic resource]  c2025  aNitrous oxide is a potent greenhouse gas, with N fertilizers being one of its major sources. Plant growth-promoting bacteria have been used to mitigate N2O emissions by improving N use efficiency in plants. In addition, some of these microorganisms are capable of reducing N2OtoN2,aprocessthatcouldbefurtherexploredasacomplementarymitigation strategy. This study aimed to test whether Azospirillum brasilense strains Ab-V5 and AbV6, and strain Wa3, as well as Nitrospirillum viridazoti strain BR 11145, already used in commercial inoculants for N-fertilized crops and known to carry the nosZ gene encoding nitrous oxide reductase, could act as biological sinks for this gas. In the pot experiment, soils fertilized with N and inoculated with N. viridazoti exhibited consistently lower N2O emissions, but not when A. brasilense strains were used. The mitigation effect was observed both in bare soil (72% emission reduction) and in the presence of millet plants (60% emission reduction), confirming the ability of N. viridazoti strain BR 11145 to consume N2O. In a f ield experiment conducted with maize, inoculation with N. viridazoti again reduced N2O f luxes during the first two weeks after fertilization compared with the urea-only treatment. However, no significant differences were detected comparing emission factors, whose calculation requires consideration of the entire monitoring period, thereby adding more variability. While N2O mitigation was observed, no significant effects of inoculation or N fertilization were found on maize growth or yield. Nonetheless, the consistent reduction in N2Oemissions achieved with N. viridazoti strain BR 11145 suggests that inoculants with this bacterium represent a promising biological sink for N2O, offering a novel nature-based solution to enhance the sustainability of tropical crop management.  aAzospirillum brasilense  aNitrous oxide  aPlant growth-promoting rhizobacteria1 aZILLI, J. E.1 aLISBOA, F. M.1 aALVES, G. C.1 aZATORRE, N. F.1 aURQUIAGA, S.1 aREIS, V. M.1 aRIBEIRO, S. A.1 aSILVA, C. S. R. de A. da1 aSILVA, P. L. da1 aALVES, B. J. R.  tAgronomygv. 15, 2856, 2025.