Interaction of nitrate assimilation and photorespiration at elevated CO2
dc.contributor.author | Krämer, Konrad | |
dc.contributor.author | Brock, Judith | |
dc.contributor.author | Heyer, Arnd G. | |
dc.date.accessioned | 2024-04-24T09:18:31Z | |
dc.date.available | 2024-04-24T09:18:31Z | |
dc.date.issued | 2022 | de |
dc.date.updated | 2023-11-14T01:29:48Z | |
dc.description.abstract | It has been shown repeatedly that exposure to elevated atmospheric CO2 causes an increased C/N ratio of plant biomass that could result from either increased carbon or - in relation to C acquisition - reduced nitrogen assimilation. Possible reasons for diminished nitrogen assimilation are controversial, but an impact of reduced photorespiration at elevated CO2 has frequently been implied. Using a mutant defective in peroxisomal hydroxy-pyruvate reductase (hpr1-1) that is hampered in photorespiratory turnover, we show that indeed, photorespiration stimulates the glutamine-synthetase 2 (GS) / glutamine-oxoglutarate-aminotransferase (GOGAT) cycle, which channels ammonia into amino acid synthesis. However, mathematical flux simulations demonstrated that nitrate assimilation was not reduced at elevated CO2, pointing to a dilution of nitrogen containing compounds by assimilated carbon at elevated CO2. The massive growth reduction in the hpr1-1 mutant does not appear to result from nitrogen starvation. Model simulations yield evidence for a loss of cellular energy that is consumed in supporting high flux through the GS/GOGAT cycle that results from inefficient removal of photorespiratory intermediates. This causes a futile cycling of glycolate and hydroxy-pyruvate. In addition to that, accumulation of serine and glycine as well as carboxylates in the mutant creates a metabolic imbalance that could contribute to growth reduction. | en |
dc.identifier.issn | 1664-462X | |
dc.identifier.other | 1887319077 | |
dc.identifier.uri | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-142822 | de |
dc.identifier.uri | http://elib.uni-stuttgart.de/handle/11682/14282 | |
dc.identifier.uri | http://dx.doi.org/10.18419/opus-14263 | |
dc.language.iso | en | de |
dc.relation.uri | doi:10.3389/fpls.2022.897924 | de |
dc.rights | info:eu-repo/semantics/openAccess | de |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | de |
dc.subject.ddc | 570 | de |
dc.title | Interaction of nitrate assimilation and photorespiration at elevated CO2 | en |
dc.type | article | de |
ubs.fakultaet | Energie-, Verfahrens- und Biotechnik | de |
ubs.institut | Institut für Biomaterialien und biomolekulare Systeme | de |
ubs.publikation.seiten | 14 | de |
ubs.publikation.source | Frontiers in plant science 13 (2022), No. 897924 | de |
ubs.publikation.typ | Zeitschriftenartikel | de |
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