[en] Atmospheric carbon dioxide (CO2) is increasing, and this affects plant photosynthesis and biomass production. Under elevated CO2 conditions (eCO2), plants need to cope with an unbalanced carbon-to-nitrogen ratio (C/N) due to a limited C sink strength and/or the reported constrains in leaf N. Here, we present a physiological and metabolic analysis of ammonium (NH4+)-tolerant pea plants (Pisum sativum L., cv. snap pea) grown hydroponically with moderate or high NH4+ concentrations (2.5 or 10 mM), and under two atmospheric CO2 concentrations (400 and 800 ppm). We found that the photosynthetic efficiency of the NH4+ tolerant pea plants remain intact under eCO2 thanks to the capacity of the plants to maintain the foliar N status (N content and total soluble proteins), and the higher C-skeleton requirements for NH4+ assimilation. The capacity of pea plants grown at 800 ppm to promote the C allocation into mobile pools of sugar (mainly sucrose and glucose) instead of starch contributed to balancing plant C/N. Our results also support previous observations: plants exposed to eCO2 and NH4+ nutrition can increase of stomatal conductance. Considering the C and N source-sink balance of our plants, we call for exploring a novel trait, combining NH4+ tolerant plants with a proper NH4+ nutrition management, as a way for a better exploitation of eCO2 in C3 crops.
Jauregui, Ivan ; Université de Liège - ULiège > TERRA Research Centre > Plant Sciences
Rivero-Marcos, Mikel; Department of Sciences, Institute for Multidisciplinary Research in Applied Biology (IMAB), Public University of Navarre, Campus Arrosadía, Pamplona 31006, Spain
Aranjuelo, Iker; Instituto de Agrobiotecnología (IdAB), Universidad Pública de Navarra-CSIC-Gobierno de Navarra, Campus de Arrosadía, Mutilva Baja E-31192, Spain
Aparicio-Tejo, Pedro M; Department of Sciences, Institute for Multidisciplinary Research in Applied Biology (IMAB), Public University of Navarre, Campus Arrosadía, Pamplona 31006, Spain
Lasa, Berta; Department of Sciences, Institute for Multidisciplinary Research in Applied Biology (IMAB), Public University of Navarre, Campus Arrosadía, Pamplona 31006, Spain. Electronic address: berta.lasa@unavarra.es
Ariz, Idoia; Department of Sciences, Institute for Multidisciplinary Research in Applied Biology (IMAB), Public University of Navarre, Campus Arrosadía, Pamplona 31006, Spain
Language :
English
Title :
Could ammonium nutrition increase plant C-sink strength under elevated CO2 conditions?
This work has been funded by the Spanish National Research and Development Programme: AGL2009–13339-C02–02, AGL2011–30386-C02–02 and AGL2012–37815-C05–05, RTI2018–094623-B-C22.Ivan Jauregui acknowledge financial support of the Belgian FNRS (Fonds de la Recherch? Scientifique) grant number 1.B.216.20F. This work has been funded by the Spanish National Research and Development Programme: AGL2009?13339-C02?02, AGL2011?30386-C02?02 and AGL2012?37815-C05?05, RTI2018?094623-B-C22. We thank G. Garijo from Universidad P?blica de Navarra (UPNA) for technical assistance. Besides, we also thanks the referees and editor the constructive comments to improve our manuscript.Ivan Jauregui acknowledge financial support of the Belgian FNRS (Fonds de la Recherché Scientifique) grant number 1.B.216.20F.
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