Publication: 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
Issued Date
2005-10-14
Resource Type
ISSN
01761617
Other identifier(s)
2-s2.0-24944483194
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Plant Physiology. Vol.162, No.10 (2005), 1123-1132
Suggested Citation
Marasri Ruengjitchatchawalya, László Kovács, Tipawan Mapaisansup, Anna Sallai, Zoltán Gombos, Mathurose Ponglikitmongkol, Morakot Tanticharoen 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. Journal of Plant Physiology. Vol.162, No.10 (2005), 1123-1132. doi:10.1016/j.jplph.2004.11.012 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/16192
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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
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.