Thermoluminescence studies on spinach leaves and euglena

Desai, T. S. ; Sane, P. V. ; Tatake, V. G. (1975) Thermoluminescence studies on spinach leaves and euglena Photochemistry and Photobiology, 21 (5). pp. 345-350. ISSN 0031-8655

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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.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
ID Code:45104
Deposited On:25 Jun 2011 05:46
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