Higher plant-like fluorescence induction and thermoluminescence characteristics in cyanobacterium, Spirulina mutant defective in PQH2 oxidation by cytb6/f complex

Marasri Ruengjitchatchawalya, László Kovács, Tipawan Mapaisansup, Anna Sallai, Zoltán Gombos, Mathurose Ponglikitmongkol, Morakot Tanticharoen

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3 Citations (Scopus)


Characterization of the photosynthetic electron transport in a mutant of Spirulina platensis, generated by chemical mutagenesis, demonstrated that the electron transfer from the plastoquinone (PQ) to cytochrome b6/f was slowed. Thermoluminescence (TL) measurements suggested the presence of reversed energy flow via PQ, which resulted in an emergence of the plant-like after-glow TL band at 45°C that could be enhanced by the transthylakoidal pH gradient and could be eliminated by an uncoupler, FCCP. The localization of the changes in the electron transport of the mutant cells measured by various methods revealed that the re-oxidation of the PQ pool is hampered in the mutant compared to the wild-type cells. The reduction in energy migration was localized between PQ and PS I reaction centers.

Original languageEnglish
Pages (from-to)1123-1132
Number of pages10
JournalJournal of Plant Physiology
Issue number10
Publication statusPublished - Oct 14 2005



  • After-glow thermoluminescence
  • Cytochrome b/f
  • Mutant
  • PQ pool
  • PS I
  • PS II
  • Photosynthetic characteristics
  • Spirulina (Arthrospira) platensis
  • electron transport

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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