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THERMOLUMINESCENCE STUDIES ON SPINACH LEAVES AND EUGLENA
Author(s) -
Desai T. S.,
Sane P. V.,
Tatake V. G.
Publication year - 1975
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.1751-1097.1975.tb06682.x
Subject(s) - dcmu , thermoluminescence , spinach , photochemistry , excited state , euglena , luminescence , photosystem ii , chemistry , electron transport chain , analytical chemistry (journal) , materials science , chloroplast , photosynthesis , atomic physics , physics , chromatography , optoelectronics , biochemistry , gene
— Spinach leaves and Euglena cells when frozen in light to 77 K emit light during slow warming in the dark to give 6 peaks. The peak appearing at 118 K is observed even after DCMU or heat treatment and also in aged chloroplasts that are inactive in electron transport. The data indicate that peaks appearing at 261 and 321 K are due to back reactions of primary acceptors of PS II and PS I respectively with oxidized chlorophylls. The DCMU sensitivity of Tl peaks at 283 and 298 K suggests that they are associated with the flow of electrons between PS II and PS I. Evidence has been presented to show that the PS 1 chlorophylls are involved in part of the luminescence observed during the temperature rise. A mechanism involving the return of the thermally detrapped electrons to the ground state of chlorophylls through their excited states has been proposed to explain some of the Tl peaks.