Time sequence of the damage to the acceptor and donor sides of photosystem II by UV-B radiation as evaluated by chlorophyll a fluorescence

J.J.S. van Rensen, W.J. Vredenberg, G.C. Rodrigues

Research output: Contribution to journalArticleAcademicpeer-review

22 Citations (Scopus)

Abstract

The effects of ultraviolet-B (UV-B) radiation on photosystem II (PS II) were studied in leaves of Chenopodium album. After the treatment with UV-B the damage was estimated using chlorophyll a fluorescence techniques. Measurements of modulated fluorescence using a pulse amplitude modulated fluorometer revealed that the efficiency of photosystem II decreased both with increasing time of UV-B radiation and with increasing intensity of the UV-B. Fluorescence induction rise curves were analyzed using a mechanistic model of energy trapping. It appears that the damage by UV-B radiation occurs first at the acceptor side of photosystem II, and only later at the donor side.
Original languageEnglish
Pages (from-to)291-297
JournalPhotosynthesis Research
Volume94
Issue number2
DOIs
Publication statusPublished - 2007

Keywords

  • electron-transport
  • plant-cells
  • leaves
  • components
  • stress

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