Chapter 16: MOA Part 2: Amino Acid Synthesis Inhibitors & Nitrogen Metabolism Inhibitors
Disclaimer:
The information and suggestions in this publication are intended to provide general guidelines for weed management in Ohio. Because of changing laws and regulations, Ohio State University Extension assumes no liability for the recommendations. The recommendations for using pesticides included in this guide are incomplete and should not serve as a substitute for pesticide labels. Complete instructions for the use of a specific pesticide are on the pesticide label. The pesticide user is responsible for applying pesticides according to label directions, as well as for problems that may arise through misapplication or misuse of the pesticide. Label changes, product cancellations, and changes in recommendations may have occurred since the publication of this guide. Check with your county Extension agent in agriculture if you are in doubt about a pesticide you plan to use. Trade names have been used in this guide for clarity, but do not constitute an endorsement by The Ohio State University, nor do they imply discrimination against other products.
Copyright 2018
Chapter Authors
Dr. Deana Namuth-Covert, Professor and Ms. Amy Kohmetscher, Instructional Designer
Ohio State – Agricultural Technical Institute
College of Food, Agricultural and Environmental Sciences
The Ohio State University
Select materials in this chapter are utilized and updated from:
Nissen, S. and Namuth, D. (2000) Inhibitors of Aromatic Amino Acid Biosynthesis http://passel.unl.edu/pages/informationmodule.php?idinformationmodule=959117477
Nissen, S., (2006), Inhibitors of Branched Chain Amino Acid Biosynthesis http://passel.unl.edu/pages/informationmodule.php?idinformationmodule=980466115
Amino acids and proteins are important components of plant cells. This chapter will detail the biochemical mechanisms that are affected by herbicides which inhibit a plant’s ability to synthesize amino acids. We will explore the two herbicide Modes of Actions and three Sites of Action which target these biochemical pathways. We will pay particular attention to the herbicide, glyphosate (i.e. Roundup), including the crop variety advances made by biotechnology.
Top: Figure 1. Round-up damage on dogbane (WSSA Group 9 – EPSP (HRAC Group G). Image from Doug Doohan, Ohio State University/ OARDC, Bugwood.org. https://www.weedimages.org/browse/detail.cfm?imgnum=1616006
Bottom left: Figure 2. Typical injury resulting from the application of an ALS herbicide. (WSSA Group 2 – ALS (HRAC Group B). Image from Kappler and Namuth at the Plant and Soil Sciences eLibrary. http://passel.unl.edu/pages/informationmodule.php?idinformationmodule=1059083105&topicorder=5&maxto=5&minto=1
Bottom right: Figure 3. Liberty damage symptoms on susceptible corn (WSSA Group 10 – GSI (HRAC Group H). Image from University of Wisconsin Extension. https://fyi.uwex.edu/weedsci/1883-2/