The Role of Cyclic and Pseudocyclic Photophosphorylation in Photosynthetic14CO2Fixation inHydrodictyon africanum
- 1 February 1970
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 21 (1) , 1-16
- https://doi.org/10.1093/jxb/21.1.1
Abstract
Experiments are reported in which the effects on photosynthesis of various inhibitors of cyclic photophosphorylation were investigated. These inhibitors, generally had only a small inhibitory effect on photosynthesis, and the inhibition was not increased by conditions which inhibit pseudocyclic photophosphorylation. These inhibitors do not inhibit the Emerson enhancement effect. From these results it was concluded that photosynthesis does not need any ATP other than that produced in non-cyclic photophosphorylation. The effects of these inhibitors on active K influx in light-anaerobic conditions in the presence or absence of CO2 suggest that some of the ATP produced by non-cyclic photophosphorylation can be used to support active K influx. The results are discussed in relation to the mechanism of the Emerson effect, the stoichiometry of non-cyclic photophosphorylation, and the ATP requirements for autotrophic growth.Keywords
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