Participation of the g = 1.9 and g = 1.82 EPR forms of the semiquinone‐iron complex, QA−·Fe2+ of photosystem II in the generation of the Q and C thermoluminescence bands, respectively
Authors:
- Ch. GoussiasCGCh. Goussias
- G. BernátGBG. Bernát
- L. KovácsLKL. Kovács
- V. PetrouleasVPV. Petrouleas
- 27 December 1993
- journal article
- Published by Wiley in FEBS Letters
- Vol. 336 (2) , 352-356
Abstract
Following illumination at 200 K, the charge recombination reactions and the origin of the thermoluminescence (TL) bands appearing at about 0°C (Q band) and +50°C (C band) in the glow curve were investigated by comparative TL and EPR measurements in DCMU‐treated photosystem II particles. Decay half‐time measurements carried out at −25°C and +25°C, respectively, suggest that the S2 state (multi‐line signal) undergoes charge recombination with the g = 1.9 form of the semiquinone‐iron complex, QA −·Fe2+, resulting in the appearance of the Q band, and that the g = 1.82 form of QA −·Fe2+ back‐reacts with the oxidized tyrosine, YD + (Signal IIs), accounting for the generation of the C band.Keywords
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