PMID: 61041Sep 13, 1976Paper

Multi-temperature effects on Hill reaction activity of barley chloroplasts

Biochimica Et Biophysica Acta
W G Nolan, R M Smillie

Abstract

1. The relationship between temperature and Hill reaction activity has been investigated in chloroplasts isolated from barley (Hordeum vulgare L. cv. Abyssinian). 2. An Arrhenius plot of the photoreduction of 2,6-dichlorophenolindophenol (DCIP) showed no change in slope over the temperature range 2--38degreesC. The apparent Arrhenius activation energy (Ea) for the reaction was 48.1 kJ/mol. 3. In the presence of an uncoupler of photophosphorylation, methylamine, the Ea for DCIP photoreduction went through a series of changes as the temperature was increased. Changes were found at 9, 20, 29 and 36degreesC. The Ea was highest below 9degreesC at 63.7 kJ/mol. Between 9 and 20degreesC the Ea decreased to 40.4 kJ/mol and again to 20.2 kJ/mol between 20 and 29degreesC. Between 29 and 36degreesC there was no further increase in activity with increasing temperature. The temperature-induced changes at 9, 20 and 29degreesC were reversible. At temperatures above 36degreesC (2 min) a thermal and largely irreversible inactivation of the Hill reaction occurred. 4. Temperature-induced changes in Ea were also found when ferricyanide was substituted for DCIP or gramicidin D for methylamine. The addition of an uncoupler of photophosphorylation was...Continue Reading

References

Jul 28, 1967·Journal of Molecular Biology·S H Howell, E N Moudrianakis
Nov 15, 1971·FEBS Letters·R KraayenhofT Grunwald
Mar 20, 1932·The Journal of General Physiology·R Emerson, W Arnold

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Citations

Oct 1, 1979·Planta·K A Santarius, M Müller
Jan 1, 1981·Progress in Biophysics and Molecular Biology·P J Quinn
Apr 1, 1979·Proceedings of the National Academy of Sciences of the United States of America·P A Armond, L A Staehelin
Jan 10, 2008·Plant, Cell & Environment·David S Kubien, Rowan F Sage
Aug 12, 2020·Photosynthesis Research·Alexander N Tikhonov, Alexey V Vershubskii
Jan 1, 1978·Progress in Biophysics and Molecular Biology·P J Quinn, W P Williams
Oct 28, 2009·The Journal of Physical Chemistry. B·Mário Fragata, Venkataramanaiah Viruvuru

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