Adaptation of photosynthetic electron-transport rate to growth temperature in pea |
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Authors: | R A C Mitchell J Barber |
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Institution: | (1) AFRC Photosynthesis Research Group, Department of Pure and Applied Biology, Imperial College of Science and Technology, SW7 2BB London, UK;(2) Present address: Lehrstuhl für Biochemie der Pflanzen, Westfälische Wilhelms-Universität, Hindenburg-Platz 55, D-4400 Münster, Federal Republic of Germany |
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Abstract: | Pea (Pisum sativum L. cv. Feltham First) plants were germinated and grown under two temperature regimes, one chilling (6–8° C) and one non-chilling (16–18° C), which are referred to as cold-grown and warm-grown, respectively. It was found that: (1) At saturating light intensity and with excess CO2, cold-grown leaves exhibited faster rates of oxygen evolution than warm-grown leaves when measured below 15° C. However when measurements were carried out above this temperature, the reverse relationship was observed. (2) Full-chain electron-transport measurements on thylakoids showed that those isolated from cold-grown plants had greater light-saturated uncoupled rates than their warm-grown equivalents at all temperatures between 3 and 19° C. (3) This difference was apparently not due to a greater activity of photosystem I or II in the thylakoids from cold-grown plants, but rather to a more rapid turnover of a dark step within the electron-transport chain. These results are interpreted in terms of a previously reported apparent homeoviscous adaptation of the pea thylakoid membrane to growth temperature (J. Barber, R.C. Ford, R.A.C. Mitchell, P.A. Millner, 1984, Planta 161, 375–380).Abbreviations Chl
chlorophyll
- DCMU
3-(3,4-dichlorophenyl)-1,1-dimethylurea
- DCPIPH2
reduced 2,6-dichlorophenolindophenol
- DMBQ
2,6-dimethyl-1,4-benzoquinone
- MV
methyl viologen
- PSI(II)
photosystem I(II) |
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Keywords: | Chloroplast Electron transport Photosynthesis Pisum (electron transport) Temperature adaptation |
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