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http://dx.doi.org/10.18419/opus-14016
Autor(en): | Krämer, Konrad Kepp, Gabi Brock, Judith Stutz, Simon Heyer, Arnd G. |
Titel: | Acclimation to elevated CO2 affects the C/N balance by reducing de novo N‐assimilation |
Erscheinungsdatum: | 2021 |
Dokumentart: | Zeitschriftenartikel |
Seiten: | 13 |
Erschienen in: | Physiologia plantarum 174 (2022), No. e13615 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-140355 http://elib.uni-stuttgart.de/handle/11682/14035 http://dx.doi.org/10.18419/opus-14016 |
ISSN: | 1399-3054 0031-9317 |
Zusammenfassung: | Plants exposed to elevated atmospheric CO2 concentrations show an increased photosynthetic activity. However, after prolonged exposure, the activity declines. This acclimation to elevated CO2 is accompanied by a rise in the carbon‐to‐nitrogen ratio of the biomass. Hence, increased sugar accumulation and sequential downregulation of photosynthetic genes, as well as nitrogen depletion and reduced protein content, have been hypothesized as the cause of low photosynthetic performance. However, the reason for reduced nitrogen content in plants at high CO2 is unclear. Here, we show that reduced photorespiration at increased CO2‐to‐O2 ratio leads to reduced de novo assimilation of nitrate, thus shifting the C/N balance. Metabolic modeling of acclimated and non‐acclimated plants revealed the photorespiratory pathway to function as a sink for already assimilated nitrogen during the light period, providing carbon skeletons for de novo assimilation. At high CO2, low photorespiratory activity resulted in diminished nitrogen assimilation and eventually resulted in reduced carbon assimilation. For the hpr1‐1 mutant, defective in reduction of hydroxy‐pyruvate, metabolic simulations show that turnover of photorespiratory metabolites is expanded into the night. Comparison of simulations for hpr1‐1 with those for the wild type allowed investigating the effect of a perturbed photorespiration on N‐assimilation. |
Enthalten in den Sammlungen: | 04 Fakultät Energie-, Verfahrens- und Biotechnik |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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PPL_PPL13615.pdf | 1,55 MB | Adobe PDF | Öffnen/Anzeigen |
Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons