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Action of EMD-IT 5914 on Chloroplasts

Published online by Cambridge University Press:  12 June 2017

K. J. Kunert
Affiliation:
Unit of Plant Physiol. and Biochem., Biology Dep., Univ. of Konstanz, D-7750 Konstanz, Germany
P. Böger
Affiliation:
Unit of Plant Physiol. and Biochem., Biology Dep., Univ. of Konstanz, D-7750 Konstanz, Germany

Abstract

The experimental herbicide EMD-IT 5914 [difunon, 5-dimethyl-amino-methylene-2-oxo-4-phenyl-2,5-dihydrofurane-carbonitrile-(3)] was applied to unicellular algae and its effect on growth, oxygen evolution and photosynthetic electron transport measured. Inhibition of biosynthesis of chloroplast pigments was evaluated in relation to the activities of porphobilinogenase and δ-aminolevulinic acid dehydratase. The only direct effect of the herbicide was an inhibition of carotenoid biosynthesis but not of photosynthetic electron transport or enzymic activities connected with porphyrin biosynthesis. Chlorophyll bleaching is considered to be a secondary process.

Type
Research Article
Copyright
Copyright © 1978 by the Weed Science Society of America 

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