Mechanism of Action of the Herbicidal Compound LY181977

  • V. J. Streusand
  • R. J. Eilers

Abstract

LY181977 (5-cyano-1-(1,1-dimethylethyl)-N-methyl-lH-pyrazole-4-carboxamide) is active in pre- and post-emergent applications against annual grasses in corn and cereal grains (1,2). The symptoms caused by treatment with LY181977 include growth inhibition and chlorosis, followed by necrosis and death in 14–17 days (1), similar to the symptoms caused by atrazine and diuron (3). Both atrazine and diuron bind to the thylakoid protein, D1, at the herbicide binding site, thus inhibiting photosynthetic electron transport through photosystem II (4,5,6,7). This inhibition results in increased chlorophyll fluorescence and decreased rates of the Hill reaction (8,9,10,11,12).

Keywords

Chlorophyll Fluorescence Leaf Disc Oxygen Evolution Photosynthetic Electron Transport Annual Grass 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • V. J. Streusand
    • 1
  • R. J. Eilers
    • 1
  1. 1.Lilly Research LaboratoriesA Division of Eli Lilly and CompanyGreenfieldUSA

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