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

  • Shi-Gui Yu
  • Lars Olof Björn
Publishing year: 1996
Language: English
Pages: 35-38
Publication/Series: Journal of Photochemistry and Photobiology, B: Biology
Volume: 34
Issue: 1
Document type: Journal article
Publisher: Elsevier

Abstract english

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.


  • Biological Sciences
  • Stroma lamellae
  • Grana Lamellae
  • UV-B Sensitivity
  • Photosystem II


  • ISSN: 1011-1344
Lars Olof Björn
E-mail: lars_olof [dot] bjorn [at] biol [dot] lu [dot] se

Professor emeritus

Molecular Cell Biology

+46 46 222 72 53