Pflanzenwissenschaftliches Kolloquium mit Anja Krieger-Liszkay
Beim nächsten Pflanzenwissenschaftlichen Kolloquium wird Prof. Dr. Anja Krieger-Liszkay einen Vortag halten zum Thema „Redox regulation of photosynthetic electron transport“.
Zeit
Freitag, 12.06.26 - 12:15 Uhr
Veranstaltungsformat
Vortrag
Themengebiet
Many regulatory mechanisms of photosynthetic light use are subjected to a redox control. Redox regulations take place at different levels. Redox changes finetune photosynthetic electron transfer at the photosynthetic reaction centers, the reduction state of the electron transport chain has a signalling function and thiol-modifications mediated by the redoxin network do not only activate the Calvin-Benson Cycle but also modulate alternative electron transport routes. These redox regulations affect the generation of reactive oxygen species like singlet oxygen and superoxide. The midpoint potential of the primary quinone acceptor QA in PSII changes upon replacement of bicarbonate ligand at the non-heme iron by small carboxylic acids. According to our data, photorespiratory metabolites like glycolate shift this midpoint potential towards a more positive value and reduce thereby the amount of singlet oxygen. This observation may be relevant under drought conditions. In PSI, the reduction of oxygen depends on the redox state of a disulfide bridge, which is controlled by the redoxin system (thioredoxin m, peroxiredoxin). While thioredoxin m has a positive effect on O2 reduction by PSI, it down regulates cyclic electron flow. These redox regulations seem to be important for ROS signalling within a cell and even for signalling events affecting the developmental program of a plant.
Referierende
Prof. Dr. Anja Krieger-Liszkay (Reserach director CNRS (DR1), Institute for Integrative Biology of the Cell, CEA, CNRS, University Paris-Saclay) on „Redox regulation of photosynthetic electron transport“
Zielgruppen
Studierende
Wissenschaftler*innen
Ort
Nussallee 9
Raum
Hörsaal X
Reservierung
nicht erforderlich
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Veranstalter
Pfanzenwissenschaftliches Kolloquium
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