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Amicarbazone, a New Photosystem II Inhibitor

  • Franck E. Dayan (a1), Maria L. B. Trindade (a2) and Edivaldo D. Velini (a2)

Amicarbazone is a new triazolinone herbicide with a broad spectrum of weed control. The phenotypic responses of sensitive plants exposed to amicarbazone include chlorosis, stunted growth, tissue necrosis, and death. Its efficacy as both a foliar- and root-applied herbicide suggests that absorption and translocation of this compound is very rapid. This new herbicide is a potent inhibitor of photosynthetic electron transport, inducing chlorophyll fluorescence and interrupting oxygen evolution ostensibly via binding to the QB domain of photosystem II (PSII) in a manner similar to the triazines and the triazinones classes of herbicides. As a result, its efficacy is susceptible to the most common form of resistance to PSII inhibitors. Nonetheless, amicarbazone has a good selectivity profile and is a more potent herbicide than atrazine, which enables its use at lower rates than those of traditional photosynthetic inhibitors.

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W.Draber , A.Trebst , and W.Oettmeier 1995. Structure-activity relationships of quinone and acridone photosystem II inhibitors. Pages 186198. In C.Hansch and T.Fujita Classical and Three-Dimensional QSAR in Agrochemistry. American Chemical Society Symposium Series. Washington, DC American Chemical Society.

G.Theodoridis , J. S.Baum , F. W.Hotzman , M. C.Manfredi , L. L.Maravetz , J. W.Lyga , J. M.Tymonko , K. R.Wilson , K. M.Poss , and M. J.Wyle 1992. Synthesis and herbicidal properties of aryltriazolinones: a new class of pre- and postemergence herbicides. American Chemical Society Symposium Series. Washington, DC American Chemical Society.

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Weed Science
  • ISSN: 0043-1745
  • EISSN: 1550-2759
  • URL: /core/journals/weed-science
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