Marino Bilbao, Daniel
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Marino Bilbao
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Daniel
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Ciencias del Medio Natural
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Publication Open Access Assessing the efficiency of dimethylpyrazole-based nitrification inhibitors under elevated CO2 conditions(Elsevier, 2021) Bozal-Leorri, Adrián; González Murua, Carmen; Marino Bilbao, Daniel; Aparicio Tejo, Pedro María; Corrochano Monsalve, Mario; Institute for Multidisciplinary Research in Applied Biology - IMABNitrification inhibitors (NIs) are useful tools to reduce nitrogen (N) losses derived from fertilization in agriculture. However, it remains unclear whether a future climate scenario with elevated CO2 could affect NIs efficiency. Thus, the objective of this work was to study whether the increase of atmospheric CO2 concentration would affect the efficiency of two dimethylpyrazole-based NIs: 3,4-dimethylpyrazol phosphate (DMPP) and 3,4-dimethylpyrazol succinic acid (DMPSA) in a plant-soil microcosm. To do so, Hordeum vulgare var. Henley plants were grown in soil fertilized with ammonium sulphate (AS) with or without NIs under controlled environmental conditions at ambient CO2 (aCO(2)) or elevated CO2 (eCO(2); 700 ppm). In the soil, mineral nitrogen and N2O emission evolution were monitored together with nitrifying and denitrifying population that were quantified by qPCR. In the plant, biomass, total amino acid content and isotopic discrimination of N and C were measured. Both NIs showed greater efficiency to maintain soil NH4+ content under eCO(2) compared to aCO(2), as a consequence of 80% reduction of AOB abundance in eCO(2). Indeed, both inhibitors were able to lessen 53% the N2O emissions in eCO(2) compared to aCO(2). Regarding the plant, DMPP and DMPSA negatively affected plant biomass at aCO(2) but this effect was restored at eCO(2) due to a better ammonium tolerance associated with an increase in total amino acid content. Overall, DMPP and DMPSA NIs were highly efficient under eCO(2), reducing N2O emissions and keeping N in the soil stable for longer while maintaining plant biomass production.Publication Open Access Can ammonium stress be positive for plant performance?(Frontiers Media, 2019) Marino Bilbao, Daniel; Morán Juez, José Fernando; Institute for Multidisciplinary Research in Applied Biology - IMABIn this article, we propose a change of paradigm where ammonium nutrition may be considered not exclusively as an undesirable situation for plant performance, but as a way to provoke changes in plant metabolism that can be beneficial for crop quality and plant physiology. While some of the positive effects of ammonium referred here still require further evaluation, the cross-tolerance induction of NH+4 to certain subsequent stresses, notably salinity, is clear. However, the molecular actors governing these interactions are almost completely unknown, and future works will be essential in order to fully exploit the benefits of ammonium-based fertilizers.