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Differences in UV-B sensitivity between PSII from grana lamellae and stroma lamellae

Publiceringsår: 1996
Språk: Engelska
Sidor: 35-38
Publikation/Tidskrift/Serie: Journal of Photochemistry and Photobiology B: Biology
Volym: 34
Nummer: 1
Dokumenttyp: Artikel
Förlag: Elsevier


UV-B treatment of thylakoid membranes or fractions derived from them accelerates the first rise (Fo---Fi phase) of variable fluorescence and slows down the second (Fi---Fm) rise. This can be observed for all membrane fractions but to different extents. The grana fraction is affected more by the UV-B treatment than are the intact thylakoids and the stroma lamella fraction. An exogenous electron acceptor, 2,6-dichloro-p-benzoquinone, inhibits both the initial and second rises of the fluorescence induction kinetics including the changes induced by UV-B. However, other electron acceptors, such as 2,5-dimethyl-p-benzoquinone and methyl viologen quench only the second rise of the curve. Oxygen evolution from grana-derived membranes is more sensitive to UV-B treatment than oxygen evolution from stroma lamella-derived membranes.



  • Chemistry
  • Biology and Life Sciences
  • Stroma lamellae
  • Grana Lamellae
  • UV-B Sensitivity
  • Photosystem II


  • ISSN: 1011-1344

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