Plant Physiol.
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Plant Physiology 81:1003-1007 (1986)
© 1986 American Society of Plant Biologists

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Articles

Light Dependent Reduction of Pertechnetate (99TcO4–) by Broken Chloroplasts 1

Johan F. Lembrechts and Gilbert M. Desmet

Rijksinstituut voot Volksgezondheid en Milieuhygiëne, c/o Stichting ITAL Keyenbergseweg 6, 6704 PJ Wageningen, The Netherlands, Laboratory of Radiation Research, c/o Stichting ITAL Keyenbergseweg 6, 6704 PJ Wageningen, The Netherlands

Arguments are given for a ferredoxin-mediated reduction of TcO4–, preponderantly into extractable Tc(V) complexes, by illuminated, broken chloroplasts. Photosynthetic O2- and NADP-reduction competitively inhibit Tc incorporation. As for O2, the reaction can be stimulated by the auto-oxidizable electron acceptor methyl viologen. Furthermore TcO4– can function as terminal acceptor in the diaphorase reaction, with NADPH as electron donor.

1 Publication No. 2298 of Contract No. B16-036-NL of the Radiation Protection Programme, DG XII of the Commission of the European Communities.






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Copyright © 1986 by the American Society of Plant Biologists