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Inhibition of Photosynthesis by Pyriclor

Published online by Cambridge University Press:  12 June 2017

R. W. Meikle
R. W. Meikle*
Affiliation:
Agricultural Research, The Dow Chemical Company, Walnut Creek, California
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Abstract

The effect of 2,3,5-trichloro-4-pyridinol (pyriclor) on some photochemical reactions that bring about the formation of assimilatory power—the generation of adenosine-5′-triphosphate (ATP) and reduced nicotinamide-adenine dinucleotide phosphate (NADHP2)–at the expense of radiant energy has been determined using isolated spinach (Spinacia oleracea L., var. Viroflay) chloroplasts. The assimilation of carbon dioxide and cyclic photophosphorylation catalyzed by riboflavin-5′-phosphate (FMN) both showed inhibition at a rather high level of the pyridinol. However, oxygen evolution and non-cyclic photophosphorylation were strongly inhibited. Evidence is presented to support the conclusion that the locus of attack is the oxygen-evolving system and/or Pigment System 2 of the photosynthetic apparatus.

Type
Research Article
Information
Weed Science , Volume 18 , Issue 4 , July 1970 , pp. 475 - 478
Copyright
Copyright © 1970 Weed Science Society of America 

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References

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