Amicarbazone, a New Photosystem II Inhibitor

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 a...

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Bibliographic Details
Published in:Weed science 2009-11, Vol.57 (6), p.579-583
Main Authors: Dayan, Franck E., Trindade, Maria L. B., Velini, Edivaldo D.
Format: Article
Language:English
Subjects:
amicarbazone
application rate
Biological and medical sciences
Chemical control
chlorophyll
chlorosis
Corn
electron transfer
Electrons
Evolution
fluorescence
foliar application
Fundamental and applied biological sciences. Psychology
gas production (biological)
Herbicide mode of action
herbicide resistance
Herbicides
land application
mechanism of action
mortality
necrosis
Oxygen
Parasitic plants. Weeds
phenotype
photosynthesis
Photosystem II
PHYSIOLOGY, CHEMISTRY, AND BIOCHEMISTRY
Phytopathology. Animal pests. Plant and forest protection
plant growth
Plants
signs and symptoms (plants)
Sugar cane
Thylakoids
translocation (plant physiology)
triazolone herbicides
uptake mechanisms
Weed control
Weeds
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Summary: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. Nomenclature: Amicarbazone; photosystem inhibitor, CAS No. 129909-90-6, BAY MKH 3586; atrazine, CAS No. 1912-24-9.
ISSN:0043-1745
1550-2759
DOI:10.1614/WS-09-099.1