Photograph of Atrazine under the microscope

This powerful herbicide is a member of the symmetrical triazine class of pesticides. These chemicals are strong inhibitors of photosynthesis that work by interfering with the Hill reaction. The Hill reaction is a water-splitting (photolysis) light initiated reaction that results in the production of free oxygen by plants. The mechanism of action for atrazine appears to be due to a herbicide-produced deficiency in the growth regulator photosynthtate, caused by inhibition of photosynthesis. The tolerance of certain higher plant species to atrazine is probably a result of their ability to rapidly degrade the herbicide to non-toxic metabolites. Some of the common annual weeds that are sensitive to atrazine are chickweed, cocklebur, foxtails, lambsquarters, mustards, pigweeds, ragweed, smartweed, and wild cucumber.

© 1995-2022 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, software, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last modification: Monday, Jul 02, 2018 at 04:22 PM
Access Count Since June 1, 1997: 56977