pH dependent stabilization of S2QA- and S2QB- charge pairs studied by thermoluminescence

Imre Vass, Yorinao Inoue

Research output: Contribution to journalArticle

22 Citations (Scopus)


The pH dependence of emission peak temperature and decay time of thermoluminescence arising from S2QB- and S2QA- recombinations demonstrates that a stabilization of S2QB- occurs at low pH whereas stabilization of S2QA- occurs at high pH. Based on comparative analysis of thermoluminescence parameters of the two types of recombination, we suggest that in the pH range between 5.3 and 7.5, Em(S2/S1) and Em(QA/QA-) are constant, but Em(QB/QB-) gradually increases with decreasing pH, while in the pH range between 7.5 and 8.5, an unusual change occurs on S2QA- charge pair, which is interpreted as either a decrease in Em(S2/S1) or an increase in Em(QA/QA-).

Original languageEnglish
Pages (from-to)431-436
Number of pages6
JournalPhotosynthesis research
Issue number3
Publication statusPublished - Jan 1 1986


  • Photosystem II
  • S state
  • pH dependence
  • quinone acceptors
  • thermoluminescence

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

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