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http://dx.doi.org/10.18419/opus-14263
Autor(en): | Krämer, Konrad Brock, Judith Heyer, Arnd G. |
Titel: | Interaction of nitrate assimilation and photorespiration at elevated CO2 |
Erscheinungsdatum: | 2022 |
Dokumentart: | Zeitschriftenartikel |
Seiten: | 14 |
Erschienen in: | Frontiers in plant science 13 (2022), No. 897924 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-142822 http://elib.uni-stuttgart.de/handle/11682/14282 http://dx.doi.org/10.18419/opus-14263 |
ISSN: | 1664-462X |
Zusammenfassung: | 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. |
Enthalten in den Sammlungen: | 04 Fakultät Energie-, Verfahrens- und Biotechnik |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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Data_Sheet_1.pdf | Supplement | 100,31 kB | Adobe PDF | Öffnen/Anzeigen |
Data_Sheet_2.pdf | Supplement | 36,29 kB | Adobe PDF | Öffnen/Anzeigen |
fpls-13-897924.pdf | Artikel | 1,86 MB | Adobe PDF | Öffnen/Anzeigen |
Image_1.pdf | Supplement | 176,71 kB | Adobe PDF | Öffnen/Anzeigen |
Image_2.pdf | Supplement | 112,51 kB | Adobe PDF | Öffnen/Anzeigen |
Image_3.pdf | Supplement | 89,9 kB | Adobe PDF | Öffnen/Anzeigen |
Table_1.XLSX | Supplement | 63,98 kB | Unknown | Öffnen/Anzeigen |
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