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Vorlesung 3: Wasserhaushalt in Pflanzenzellen
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Wasserhaushalt in Pflanzenzellen
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Vorlesung 3: Wasserhaushalt in PflanzenzellenZellen erzeugen unter Energieaufwand ein internes, von der Umgebung abgegrenztes Milieu (Με τη
χρήση ενέργειας, τα κύτταρα δημιουργούν ένα εσωτερικό περιβάλλον που διαχωρίζεται από το
περιβάλλον)
Ungleichgewicht – Energie gespeichert
(Zellen setzen Energie ein, um ein internes Milieu zu schaffen, das sich von Zellumgebung
unterscheidet)
Um das zu erreichen, sind Zellen von semi-permeabler Plasmamembran umgeben:
Membran permeabel für Wasser & Gase, NICHT jedoch für Ionen und große Moleküle
Verschiedene Kompartimente der pflanzlichen Zelle:
Zellkern
Endomembransystem: Kernhülle, Glattes und Raues ER, Plasmamembran, Golgi-Apparat, Vakuole
Semiautonome Organelle: Chloroplasten und Mitochondrien
Sehr große Rolle bei Unterteilung der Zelle und Abgrenzung vom äußeren Milieu
Biologische Membranen:
Aus Phospholipiden = Phosphatidylcholin
Für Photphat limidierende Pflanzen: Galactolipide: Monogalactosyldiacylglycerin in Chroloplasten
und Mitochondrien
, Wichtige Lipidkomponente: Sterole – Pflanzenhormonen (Prasinosteroide)
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