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Title: Higher plant-like fluorescence induction and thermoluminescence characteristics in cyanobacterium, Spirulina mutant defective in PQH<inf>2</inf> oxidation by cytb<inf>6</inf>/f complex
Authors: Marasri Ruengjitchatchawalya
László Kovács
Tipawan Mapaisansup
Anna Sallai
Zoltán Gombos
Mathurose Ponglikitmongkol
Morakot Tanticharoen
King Mongkuts University of Technology Thonburi
Biological Research Center at Hungarian Academy of Sciences
Mahidol University
Thailand National Center for Genetic Engineering and Biotechnology
Keywords: Agricultural and Biological Sciences;Biochemistry, Genetics and Molecular Biology
Issue Date: 14-Oct-2005
Citation: Journal of Plant Physiology. Vol.162, No.10 (2005), 1123-1132
Abstract: 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. © 2005 Elsevier GmbH. All rights reserved.
ISSN: 01761617
Appears in Collections:Scopus 2001-2005

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