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Photosynthesis Research

, Volume 16, Issue 3, pp 187–202 | Cite as

Interaction of electron acceptors with thylakoids from halophytic and non-halophytic species

  • Christopher Preston
  • Christa Critchley
Regular Papers

Abstract

Thylakoid membranes isolated from halophytic species showed differences in their interactions with ionic and lipophilic electron acceptors when compared to thylakoids from non-halophytes. FeCN was considerably less efficient as electron acceptor with halophyte thylakoids, supporting much lower rates of O2 evolution and having a lower affinity. FeCN accepted electrons at a different, DMMIB insensitive, site with these thylakoids. 1,4-Benzo-quinones with less positive midpoint potentials were less effective in accepting electrons from halophyte thylakoids compared to nonhalophyte thylakoids, also reflected in lower rates of O2 evolution and lower affinity. Considering the lipolphilic nature and the fact that there was no apparent change in the site donating electrons to the quinones, an alteration in the midpoint potential of this site by about +100mV is postulated for the halophyte thylakoids.

Key words

electron transport halophyte mangrove photosystem II spinach thylakoid 

Abbreviations

AMPD

2-amino-2-methyl-1,3-propanediol

Cyt b6/f

cytochrome b6/f complex

DBMIB

2,5-dibromo-6-isopropyl-3-methyl-1,4-benzoquinone

DCBQ

2,6-dichloro-1,4-benzoquinone

DCIP

2,6-dichlorophenol-indolphenol

DMBQ

2,5-dimethyl-1,4-benzoquinone

Em7

midpoint redox potential at pH 7.0, FeCN-K3Fe(CN)6

HNQ

5-hydroxy-1,4-naphthoquinone

MV

methylviologen

NQ

1,4-naphthoquinone

PBQ

phenyl-1,4-benzoquinone

PC

plastocyanin

PQ

plastoquinone

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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • Christopher Preston
    • 1
  • Christa Critchley
    • 1
  1. 1.Botany Department, The FacultiesAustralian National UniversityCanberraAustralia

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