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Vorlesung 9: Photosynthese (Licht --& Dunkelreaktion, Plastiden, Kohlenstoff Metabolismus, Phloemtransport $7.04   Add to cart

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Vorlesung 9: Photosynthese (Licht --& Dunkelreaktion, Plastiden, Kohlenstoff Metabolismus, Phloemtransport

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Biochemie und Metabolismus: Photosynthese (Licht --& Dunkelreaktion, Plastiden, Kohlenstoff Metabolismus, Phloemtransport

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  • November 5, 2021
  • 13
  • 2021/2022
  • Class notes
  • Stephan hobe
  • All classes
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Vorlesung 9

Photosynthese

Lichtreaktion  Energie von Licht – Wasser gespaltet – Elektronentransportkette

Elektronentransportkette führt zu Protonengradienten in Thylakiode- H strömt ein und ATP, NADPH

Dann weiter zur Dunkelreaktion

6 CO2 + 6 H2O C6H12O6 + 6 O2

Licht: Teilchen und Strahlungscharakter

Licht = Elektromagnetische Welle c=λ*ν

Licht= Teilchen (Photon) E (Energie)= h*ν (Frequenz)

Je höher Frequenz, desto mehr Energie und kurzwellige Strahlung

Sonnenspektrum:

Apsorptionsspektrum von Chlorophyll – grüne Lücke (grünes Licht nicht absorbiert, zurückgestrahlt)!
Grund, warum Pflanzen grün erscheinen

Chorophyll absorbiert in roten und blauen Bereich

Prinzip Spektrometer (durch Prizma-Probe-Detektor-Rekorder)

Chlorophyllstruktur:




Chl-a = -CH3

Chl-b –CHO

Chlorophyll u.a. Chromophore ist gebunden-Komplex mit Proteinen: diese Komplexe= Pigmente

(Chl a) Abgabe Energie: Fluoreszenz, Wärme, Energietransfer auf anderes Chl, Photochemie
(Chemische Arbeit)

Blau 2. Anregungszustand, nicht für Arbeit genutzt, bis 1. Anregungszustand abgegeben

, Photosynthetische Pigmente




Carotinoide: linear, konjugierte
Doppelbindungen, Antennen- &
Schutzfunktion

(Phycoerythrobilin in Cyanobakterien)

Absorptionsspektren photosynthetischer Pigmente: unterschiedlich

Schlüsselexperimente:

1771 Nachweis O2 Entwicklung durch Photosynthese J. Pristley mit Maus, Kerze, Pflanze

1779 Rolle Licht in Photosynthese

Rolle Kohlendioxid und Wasser (Formel von Photosynthese)

1920: Photosynthese als Redoxprozess



Aktions- vs Absorptionsspektrum

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