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Afterglow Thermoluminescence Measured in Isolated Chloroplasts
Author(s) -
Belatik Ahmed,
Essemine Jemaa,
Hotchandani Surat,
Carpentier Robert
Publication year - 2011
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2011.01016.x
Subject(s) - photosystem i , thylakoid , photosystem ii , thermoluminescence , chloroplast , luminescence , dcmu , afterglow , electron transport chain , chemistry , photochemistry , electron acceptor , plastoquinone , p700 , photosystem , photosynthesis , analytical chemistry (journal) , materials science , physics , biochemistry , optoelectronics , astrophysics , gamma ray burst , chromatography , gene
The thermoluminescence afterglow (AG) measured in plant leaves originates from the S 2 /S 3 Q B − charge pair recombination in photosystem II (PSII) initiated by reverse electron flow from stromal reductants to PQ and then to the Q B site in PSII centers that are in the S 2 /S 3 Q B state. In this study, we show that this luminescence, absent in isolated thylakoid membranes, can be measured in intact chloroplasts that retain their stromal content including the electron acceptor pool (oxidized ferredoxin/NADP + ) of photosystem I. The properties of the chloroplasts AG emission is similar to the AG in leaves in terms of temperature maximum, period‐four modulation, far‐red light stimulation, and antimycin A inhibition.
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