Herbicide Symptoms - Part 1 (ACIS)

Glutamine synthesis inhibitor - inhibits the enzyme glutamine synthetase causing the rapid buildup of ammonia in cells but this is no longer thought to be the primary cause of cell death. The lack of glutamine also causes a buildup of glyoxylate that inhibits photorespiration and photosynthetic electron transport. Triplet chlorophyll and singlet oxygen increase causing lipid peroxidation and membrane disruption.

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Erin Taylor, etaylor@cals.arizona.edu Extension Agent, Field & Veg Crops
William B. McCloskey, wmcclosk@ag.arizona.edu Extension Weed Specialist
College of Agriculture, The University of Arizona, Tucson, AZ.
Material written June 2003.