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).
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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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Mitchell, R.A.C., Barber, J. Adaptation of photosynthetic electron-transport rate to growth temperature in pea. Planta 169, 429–436 (1986). https://doi.org/10.1007/BF00392141
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DOI: https://doi.org/10.1007/BF00392141