The Origin of Photosystem-I-mediated Electron Transport Stimulation in Heat-stressed Chloroplasts

Overview

Journal Planta

Specialty Biology

Date 2013 Nov 19

PMID 24241743

Citations 12

Authors

P G Thomas

P J Quinn

W P Williams

Affiliations

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Abstract

Exposure of isolated chloroplasts of pea (Pisum sativum L.) to temperatures above 35° C leads to a stimulation of photosystem-I-mediated electron transport from dichlorophenolindophenol to methyl viologen. The threshold temperature for this stimulation coincides closely with that for heat-induced inhibition of photosystem-II activity in such chloroplasts. This coincidence is explained in terms of a rearrangement of the thylakoid membrane resulting in the exposure of a new set of donor sites for dichlorophenolindophenol within the cytochrome f/b 6 complex of the electron-transport chain linking the two photosystems.

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