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

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Author

Summary, in 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.

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

Topic

  • Biological Sciences

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1011-1344