Abstract
THE herbicide ioxynil (4-hydroxy-3,5-diiodo benzonitrile)1 has been found to inhibit the photoreduction of ferricyanide by chloroplasts from a range of plants2 and also NADP photoreduction, the accompanying photophosphorylation and carbon dioxide fixation by the broad bean (Vicia faba) chloroplasts3. Recently, Paton and Smith4 further reported that ioxynil inhibited the photoreduction of endogenous plastoquinone in broad bean chloroplasts, even in the presence of ascorbate and indophenol. It was previously found5 that although o-phenanthroline and the herbicide DCMU inhibit the photoreduction of endogenous plastoquinone they do not inhibit the enhanced photoreduction in the presence of ascorbate and indophenol. Furthermore, ascorbate and indophenol reduce plastoquinone in darkness6, in a reaction which has been shown to be non-enzymatic7. No other inhibitors previously investigated have inhibited the dark reduction and we therefore decided to investigate the effects of ioxynil on plastoquinone reduction in more detail.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Carpenter, K., and Heywood, B. J., Nature, 200, 28 (1963). Wain, R. L., Nature, 200, 28 (1963).
Kerr, W. M., and Wain, R. L., Ann. App. Biol., 54, 447 (1964). Desmoras, J., and Jacquet, P., Sixteenth Intern. Symp. Crop Protection, 633 (1964).
Paton, D., and Smith, J. E., Weed Res., 5, 75 (1965).
Paton, D., and Smith, J. E., Nature, 207, 1211 (1965).
Friend, J., and Redfearn, E. R., Biochem. J., 82, 13P (1962). Redfearn, E. R., and Friend, J., Proc. Roy. Soc., B, 157, 364 (1963).
Friend, J., and Redfearn, E. R., Phytochem., 2, 397 (1963).
Friend, J., Olsson, R., and Redfearn, E. R., Abst. Fourth Intern. Cong. Photobiol., 121 (1964).
Redfearn, E. R., and Friend, J., Phytochem., 1, 147 (1962).
Compare Bucke, C., Leech, R. M., Hallaway, M., and Morton, R. A., Biochim. Biophys. Acta, 112, 19 (1966).
Bishop, N. I., Biochim. Biophys. Acta, 57, 186 (1962).
Vernon, L. P., and Zaugg, W. S., J. Biol. Chem., 235, 2726 (1960).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
FRIEND, J., OLSSON, R. Inhibition of Photosynthetic Electron Transport by Ioxynil. Nature 214, 942–943 (1967). https://doi.org/10.1038/214942a0
Received:
Issue Date:
DOI: https://doi.org/10.1038/214942a0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.
