Charge accumulation and recombination in Photosystem II studied by thermoluminescence. I. Participation of the primary acceptor Q and secondary acceptor B in the generation of thermoluminescence of chloroplasts

Demeter, S.; Vass, Imre

doi:10.1016/0005-2728(84)90136-1

Cited by 131 publications

(65 citation statements)

References 26 publications

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“…It should be noted that in addition to the charge recombination with QA and QB, another possible decay route of the S2 state involves a direct reduction by Y, [23,24]. However, this reaction is slower (tX = 10-20 s at room temperature), especially at low pH, than the S,Q, back-reaction (fX = l-3 s at room temperature [1,5]). …”

Section: Discussionmentioning

confidence: 99%

“…EPR spectra were obtained using a Bruker ER 200 D-SRC spectrometer interfaced to a PC and equipped with an Oxford ESR 900 cryostat. In the EPR measurement samples (3)(4)(5)(6) were illuminated at 200 K for 8 min with a projector lamp. The decay courses of the EPR signals were measured by subsequent warming and cooling the same sample to the incubation temperature and back to the measuring temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The g = 1.9 and g = 1.82 signals represent two alternative conformations of the semiquinone-iron complex [9]. Following DCMU addition the B band, as in whole chloroplasts [5], was replaced by the Q band peaking at about O'C and the amplitude of the C band increased ( Fig. 1 A, curve b).…”

Section: Methodsmentioning

confidence: 99%

“…These bands are designated as Q and C bands, respectively. The Q band has been suggested to originate from charge recombination of the SIQA redox couple [4,5]. The C band has been attributed to charge recombination of QA with an unspecified donor, D+ [6] or with Y& [l].…”

Section: Introductionmentioning

confidence: 99%

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Participation of the g = 1.9 and g = 1.82 EPR forms of the semiquinone‐iron complex, Q_A⁻·Fe²⁺ of photosystem II in the generation of the Q and C thermoluminescence bands, respectively

et al. 1993

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Following illumination at 200 K, the charge recombination reactions and the origin of the thermoluminescence (TL) bands appearing at about O°C (Q band) and +5O"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 . Fe", resulting in the appearance of the Q band, and that the g = 1.82 form of QA. Fe2' back-reacts with the oxidized tyrosine, Yi (Signal II,), accounting for the generation of the C band.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Participation of the g = 1.9 and g = 1.82 EPR forms of the semiquinone‐iron complex, Q_A⁻·Fe²⁺ of photosystem II in the generation of the Q and C thermoluminescence bands, respectively

et al. 1993

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“…This emission is due to the recombination of S 2 /S 3 Q Bpairs, Q B being the secondary quinonic electron acceptor and S 2 /S 3 , the states of the oxygenevolving complex storing positive charges (Rutherford et al, 1982;Demeter and Vass, 1984).…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence as a complementary technique for the toxicological evaluation of chemicals in photosynthetic organisms

et al. 2015

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Disorganization of the Mn₄Ca complex of photosystem II by ruthenium red: a thermoluminescence study

Gauthier

Carpentier

2008

Luminescence

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Ruthenium red (RR) is known to be an inhibitor that binds to Ca2+ sites. It releases Ca2+ and Cl(-) together with the extrinsic polypeptide of 17 kDa associated with the oxygen evolving complex of photosystem II. In this work we used thermoluminescence to study S2/3QB(-) and S2QA(-) charge recombination. It is shown that RR produced a deeper inhibition of oxygen evolution compared with the effect of extrinsic polypeptide or Ca2+/Cl(-) depletion. Even though Mn is not released, the Mn cluster is disorganized by RR and the S1-->S2 transition is inhibited.

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Charge accumulation and recombination in Photosystem II studied by thermoluminescence. I. Participation of the primary acceptor Q and secondary acceptor B in the generation of thermoluminescence of chloroplasts

Cited by 131 publications

References 26 publications

Participation of the g = 1.9 and g = 1.82 EPR forms of the semiquinone‐iron complex, Q_A⁻·Fe²⁺ of photosystem II in the generation of the Q and C thermoluminescence bands, respectively

Participation of the g = 1.9 and g = 1.82 EPR forms of the semiquinone‐iron complex, Q_A⁻·Fe²⁺ of photosystem II in the generation of the Q and C thermoluminescence bands, respectively

Thermoluminescence as a complementary technique for the toxicological evaluation of chemicals in photosynthetic organisms

Disorganization of the Mn₄Ca complex of photosystem II by ruthenium red: a thermoluminescence study

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Charge accumulation and recombination in Photosystem II studied by thermoluminescence. I. Participation of the primary acceptor Q and secondary acceptor B in the generation of thermoluminescence of chloroplasts

Cited by 131 publications

References 26 publications

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

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

Thermoluminescence as a complementary technique for the toxicological evaluation of chemicals in photosynthetic organisms

Disorganization of the Mn4Ca complex of photosystem II by ruthenium red: a thermoluminescence study

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Participation of the g = 1.9 and g = 1.82 EPR forms of the semiquinone‐iron complex, Q_A⁻·Fe²⁺ of photosystem II in the generation of the Q and C thermoluminescence bands, respectively

Participation of the g = 1.9 and g = 1.82 EPR forms of the semiquinone‐iron complex, Q_A⁻·Fe²⁺ of photosystem II in the generation of the Q and C thermoluminescence bands, respectively

Disorganization of the Mn₄Ca complex of photosystem II by ruthenium red: a thermoluminescence study