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Photosynthetic Electron Transport Inhibition by Buthidazole

Published online by Cambridge University Press:  12 June 2017

A. C. York ,
C. J. Arntzen  and
F. W. Slife
A. C. York
Affiliation:
Dep. Agron., Univ. of Illinois, Urbana, IL 61801
C. J. Arntzen
Affiliation:
Sci. Ed. Admin., U.S. Dep. Agric., and Prof. Dep. Bot., Univ. of Illinois, Urbana, IL 61801
F. W. Slife
Affiliation:
Dep. Agron., Univ. of Illinois, Urbana, IL 61801
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Abstract

The effects of buthidazole {3-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-4-hydroxy-1-methyl-2-imidazolidinone} on the photochemical reactions of isolated pea (Pisum sativum L.) chloroplast thylakoids were analyzed. Buthidazole was found to inhibit electron transport at two distinct sites in the photosynthetic electron transport chain. The major site of inhibition was on the reducing side of photosystem II at the site of diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea] and atrazine [2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] inhibition. Buthidazole also had a secondary site of electron transport inhibition on the oxidizing side of photosystem II. No evidence was found for buthidazole to act as an uncoupler or as an energy transfer inhibitor.

Keywords

Chlorophyll fluorescencesilicomolybdate photoreductionphotosystem II
Type
Research Article
Information
Weed Science , Volume 29 , Issue 1 , January 1981 , pp. 59 - 64
Copyright
Copyright © 1981 by the Weed Science Society of America 

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