Alternative electron donors to photosystem II play an important role in the reduction of the electron transport chain in heat-treated barley leaves

Tóth, Szilvia Zita: Alternative electron donors to photosystem II play an important role in the reduction of the electron transport chain in heat-treated barley leaves. In: Acta biologica Szegediensis, (49) 1-2. pp. 181-183. (2005)

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Abstract

Electron donation to TyrZ in heat-inactivated photosystem II (PSII) reaction centers by alternative donors was evaluated. Chl a fluorescence transients indicate that in the 0.1-3 ms range (K-step) only one electron is available, but that in the 0.2-2 s range accumulation of QA- took place that coincided with the re-reduction of plastocyanin PC+ and P700+. Using Chl a fluorescence emission induced by short repetitive pulses and simultaneous 820 nm transmission and Chl a fluorescence transient measurements we show that electron donation to photosystem II takes place with a halftime of ~10 ms. There is a large pool of such alternative donors and they significantly contribute to the reduction of the linear electron transport chain since inhibition of PS II by DCMU prevented the re-reduction of PC+ and P700+.

Item Type: Article
Heading title: Photosynthesis; Proceedings
Journal or Publication Title: Acta biologica Szegediensis
Date: 2005
Volume: 49
Number: 1-2
ISSN: 1588-385X
Page Range: pp. 181-183
Language: angol
Event Title: Hungarian Congress on Plant Physiology, 8., 2005, Szeged, Hungarian Conference on Photosynthesis, 6., 2005, Szeged
Uncontrolled Keywords: Természettudomány, Biológia
Additional Information: Bibliogr.: 183. p.; Abstract
Date Deposited: 2016. Oct. 17. 09:24
Last Modified: 2018. May. 28. 10:07
URI: http://acta.bibl.u-szeged.hu/id/eprint/22720

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