The origin of photosystem-I-mediated electron transport stimulation in heat-stressed chloroplasts |
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| Authors: | P G Thomas P J Quinn W P Williams |
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| Affiliation: | (1) Department of Biochemistry, King's College London (KQC), Campden Hill, W8 7AH London, UK |
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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.Abbreviations cyt
cytochrome
- DBMIB
2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone
- DCPIP (H2)
2,6-dichlorophenolindophenol
- EDAC
ethyldimethylaminopropyl-carbodiimide
- MV
methyl viologen
- PSI, II
photosystem I, II
- PCy
plastocyanin
- PQ(H2)
plastoquinone |
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| Keywords: | Chloroplast (electron transport) Heat stress Membrane organisation Pisum (electron transport and heat stress) |
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