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Inhibition of Photosystem II and Chlorella Growth by 1-(m-t-butylacetamidophenyl)-3-methyl-3-methoxy urea

Published online by Cambridge University Press:  12 June 2017

J. A. Swader  and
Celestia M. Howe
Celestia M. Howe
Affiliation:
Dep. Plant Pathol. & Physiol., Virginia Polytechnic Inst. & State Univ., Blacksburg, VA 24061
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Abstract

The experimental herbicide R-24191 [1-(m-t-butylacetamidophenyl)-3-methyl-3-methoxy urea] inhibited growth of Chlorella sorokiniana Shihira and Kraus, O2 evolution during CO2 fixation by Chlorella and isolated leaf cells of spinach (Spinacia oleracea L. ‘Winter Bloomsdale 769′), the photoreduction of NADP by isolated chloroplasts using water or hydroxylamine as the electron donor, the photoreduction of 2,6-dichloroindophenol by isolated chloroplasts, and O2 uptake by isolated chloroplasts using paraquat (1,1′-dimethyl-4,4′-bipyridinium ion) as the electron acceptor. The phenylurea herbicide had no effect on the last reaction when ascorbate plus 2,6-dichloroindophenol were used as the electron donor. The results indicate that the site of the phenylurea inhibition was in photosystem II between water-splitting and photosystem I.

Keywords

Chlorella sorokinianaSpinacia oleraceaphotosynthesisprotoplastsR-24191
Type
Research Article
Information
Weed Science , Volume 27 , Issue 2 , March 1979 , pp. 232 - 234
Copyright
Copyright © 1979 by the Weed Science Society of America 

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