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On the respiratory enhancement in Chlorella pyrenoidosa by blue light

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Summary

Previous authours have suggested that the Type I respiratory enhancement in Chlorella was the result of an increased supply of a respiratory substrate or intermediate, or a change in activity of a respiratory enzyme. Our studies with respiratory inhibitors show that the Type I effect is not a general respiratory enhancement, as would be expected from an increase in available substrate, but rather is specifically associated with the tricarboxylic acid cycle and the electron transport chain. The feedback controls on these two processes are such that changes in activities of the component enzymes or in concentrations of carbohydrate intermediates would not be expected to affect the overall respiration rate: an ATP demand is needed to explain the results. A stimulation of chloroplast RNA and protein synthesis by blue light may be the basic mechanism.

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Abbreviations

FMN:

flavin mononucleotide

DCMU:

3-(3,4-dichlorophenyl)-1,1-dimethylurea

PEP:

phosphoenolpyruvate

TCA:

tricarboxylic acid

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Author notes

  1. D. F. Sargent

    Present address: Institut für Molekularbiologie, Eidgenössische Technische Hochschule, CH-8049, Zürich, Switzerland

Authors and Affiliations

  1. Biophysics Department, University of Western Ontario, N6A 5C1, London, Ontario, Canada

    D. F. Sargent & C. P. S. Taylor

Authors
  1. D. F. Sargent
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  2. C. P. S. Taylor
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Additional information

Part of this work was reported at the 6th International Congress on Photobiology, Bochum, West Germany, 1972.

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Sargent, D.F., Taylor, C.P.S. On the respiratory enhancement in Chlorella pyrenoidosa by blue light. Planta 127, 171–175 (1975). https://doi.org/10.1007/BF00388378

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  • DOI: https://doi.org/10.1007/BF00388378

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