Dokument: Metabolic modeling of energy supply balance in photosynthesis
| Titel: | Metabolic modeling of energy supply balance in photosynthesis | |||||||
| Weiterer Titel: | Metabolic modeling of energy supply balance in photosynthesis | |||||||
| URL für Lesezeichen: | https://docserv.uni-duesseldorf.de/servlets/DocumentServlet?id=62480 | |||||||
| URN (NBN): | urn:nbn:de:hbz:061-20230530-103919-7 | |||||||
| Kollektion: | Dissertationen | |||||||
| Sprache: | Englisch | |||||||
| Dokumententyp: | Wissenschaftliche Abschlussarbeiten » Dissertation | |||||||
| Medientyp: | Text | |||||||
| Autor: | Saadat, Nima Philipp [Autor] | |||||||
| Dateien: |
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| Beitragende: | Prof. Dr. Ebenhöh, Oliver [Gutachter] Prof. Dr. Lercher, Martin [Gutachter] | |||||||
| Dewey Dezimal-Klassifikation: | 500 Naturwissenschaften und Mathematik » 570 Biowissenschaften; Biologie | |||||||
| Beschreibungen: | Although the two main processes of photosynthesis, the light dependent and the light independent reactions, are often studied in isolation, both processes exhibit a high interdependence. It is true that the energy provided by the light reactions of photosynthesis are, amongst others, limiting for the light independent reactions which utilize it. However, the fact that the rate and efficiency of the light independent reactions are apparently having a strong effect on all components of the light dependent reactions like the linear flow of electrons, the alternative electron routes and even the NPQ mechanisms show that the links between them are far more complex than just the consumption of provided energy.
In this thesis, mathematical models are used to further understand the interdependency between the light dependent reactions and the light independent reactions of photosynthesis quantitatively. It is shown that the light dependent and light independent reactions of photosynthesis can be regarded as an molecular-economic supply-demand system. In this system, the light dependent reactions represent the supply side of the system, and the light independent reactions represent the demand side. It is shown that both sides of the supply-demand system maintain control over the efficiency and rate of photosynthesis. Our model explains how a tight regulation of supply and demand reactions leads to efficient carbon fixation, and how a standby mode is necessary for maintaining intermediates necessary for carbon fixation in longer periods of darkness. Furthermore, the effect of alternative electron flows in the electron transport chain on the rest of the photosynthetic apparatus has been investigated. It is shown that the rate of the cyclic electron flow, as well as the rate of the Calvin cycle, regulate the rate of linear electron flow and the rate of the Mehler reaction by providing NADP+ as an electron acceptor. Lastly, this thesis investigates the increased production of secondary metabolites in high light conditions in photosynthetic glandular trichomes. It is shown that higher light availability allows a shift in carbon partitioning from catabolic to anabolic pathways, as well as isoprenoid production shifting from the MEV to the MEP pathway. The results of this thesis highlight how the interdependence of light dependent and independent reactions change in different environments and reveal crucial interactions between reactions in different pathways of photosynthesis and plant metabolism.Although the two main processes of photosynthesis, the light dependent and the light independent reactions, are often studied in isolation, both processes exhibit a high interdependence. It is true that the energy provided by the light reactions of photosynthesis are, amongst others, limiting for the light independent reactions which utilize it. However, the fact that the rate and efficiency of the light independent reactions are apparently having a strong effect on all components of the light dependent reactions like the linear flow of electrons, the alternative electron routes and even the NPQ mechanisms show that the links between them are far more complex than just the consumption of provided energy. In this thesis, mathematical models are used to further understand the interdependency between the light dependent reactions and the light independent reactions of photosynthesis quantitatively. It is shown that the light dependent and light independent reactions of photosynthesis can be regarded as an molecular-economic supply-demand system. In this system, the light dependent reactions represent the supply side of the system, and the light independent reactions represent the demand side. It is shown that both sides of the supply-demand system maintain control over the efficiency and rate of photosynthesis. Our model explains how a tight regulation of supply and demand reactions leads to efficient carbon fixation, and how a standby mode is necessary for maintaining intermediates necessary for carbon fixation in longer periods of darkness. Furthermore, the effect of alternative electron flows in the electron transport chain on the rest of the photosynthetic apparatus has been investigated. It is shown that the rate of the cyclic electron flow, as well as the rate of the Calvin cycle, regulate the rate of linear electron flow and the rate of the Mehler reaction by providing NADP+ as an electron acceptor. Lastly, this thesis investigates the increased production of secondary metabolites in high light conditions in photosynthetic glandular trichomes. It is shown that higher light availability allows a shift in carbon partitioning from catabolic to anabolic pathways, as well as isoprenoid production shifting from the MEV to the MEP pathway. The results of this thesis highlight how the interdependence of light dependent and independent reactions change in different environments and reveal crucial interactions between reactions in different pathways of photosynthesis and plant metabolism. | |||||||
| Lizenz: |  Dieses Werk ist lizenziert unter einer Creative Commons Namensnennung 4.0 International Lizenz | |||||||
| Fachbereich / Einrichtung: | Mathematisch- Naturwissenschaftliche Fakultät » WE Biologie | |||||||
| Dokument erstellt am: | 30.05.2023 | |||||||
| Dateien geändert am: | 30.05.2023 | |||||||
| Promotionsantrag am: | 20.12.2022 | |||||||
| Datum der Promotion: | 17.04.2023 |
