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Titolo:
TEMPORARY SUPPRESSION OF THE FLASH-INDUCED ELECTRICAL POTENTIAL ACROSS THE THYLAKOID MEMBRANE UPON ENERGIZATION
Autore:
VANVOORTHUYSEN T; DASSEN HHA; SNEL JFH; VREDENBERG WJ;
Indirizzi:
WAGENINGEN UNIV AGR,DEPT PLANT PHYSIOL,ARBORETUMLAAN 4 6703 BD WAGENINGEN NETHERLANDS WAGENINGEN UNIV AGR,DEPT PLANT PHYSIOL 6703 BD WAGENINGEN NETHERLANDS
Titolo Testata:
Physiologia Plantarum
fascicolo: 4, volume: 94, anno: 1995,
pagine: 729 - 735
SICI:
0031-9317(1995)94:4<729:TSOTFE>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOSYSTEM-II; CHLOROPHYLL FLUORESCENCE; INTACT CHLOROPLASTS; KINETICS; LEAVES; REDUCTION; PH; TRANSPORT; PHOTOSYNTHESIS; FLUOROMETER;
Keywords:
CHLOROPHYLL FLUORESCENCE; ELECTRICAL POTENTIAL; ENERGIZATION; ENERGY DISSIPATION; MICROELECTRODE; PEPEROMIA METALLICA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
T. Vanvoorthuysen et al., "TEMPORARY SUPPRESSION OF THE FLASH-INDUCED ELECTRICAL POTENTIAL ACROSS THE THYLAKOID MEMBRANE UPON ENERGIZATION", Physiologia Plantarum, 94(4), 1995, pp. 729-735

Abstract

Energization of the chloroplast thylakoid membrane causes a temporarydecrease in the amplitude of the flash-induced transmembrane electrical potential as monitored by the micro-electrode technique and by the electrochromic absorbance band shift at 518 nm in chloroplasts of Peperomia metallica. This energization-dependent decrease of the flash-induced potential has a relaxation time of recovery in the dark of about 23 +/- 4 s. The phenomenon can neither be explained by a decrease of the intrinsic efficiency of photosystem I and II (PSI and PSII) nor by a partial closure of reaction centers of PSI and PSII. This leads us to propose that the energization-dependent decrease of the amplitude ofthe flash-induced electrical potential is caused by either the formation of a fraction of PSI and/or PSII reaction centers with fast chargerecombination or by an increase of the membrane capacitance. The darkrecovery after energization of the amplitude of the transmembrane electrical potential and that of non-photochemical fluorescence quenchingwere found to be comparable, which suggests a common cause for both phenomena.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 01:25:54