15.8 Seedling Shoot Growth Inhibitors

Deana Namuth-Covert; Amy Kohmetscher

Chapter 15: MOA Part 1: Lipid Synthesis Inhibitors & Seedling Shoot Growth Inhibitors

15.8 Seedling Shoot Growth Inhibitors

seedling shoot growth inhibitors excerpt from take action herbicide classification chart — Figure 8. An excerpt from the Take Action Herbicide Classification Chart

Now we turn our attention to the second herbicide Mode of Action, Seedling Shoot Growth Inhibitors and two Sites of Action: Lipid Synthesis Inhibitors (not ACCase Inhibitors) and Long-Chain Fatty Acid Inhibitors. In this mode we are looking at herbicides that interfere with a plant’s ability to elongate fatty acid chains, which would otherwise build waxes and components of the cuticle. The following diagram is a reminder of where these fall in the biochemical pathways.

fatty acid synthesis and fatty acid elongation pathway diagram — Figure 9 Simplified schematic of fatty acid synthesis and elongation in higher plants.Abbreviations: ACCase, acetyl-CoA carboxylase; ACP acyl carrier protein; ACS, acetyl-CoA synthase; CoA, coenzyme A; dims, cyclohexanedione inhibitors; FAS, fatty acid synthase; fops, aryloxyphenoxy propionate inhibitors; PDC, pyruvate dehydrogenase complex. Modified from Gronwald, J.W. 1991. Lipid biosynthesis inhibitors. Weed Sci. 39:435-449

Seedling Shoot Growth Inhibitors
- Group 8. Lipid Synthesis Inhibitors, not ACCase (LSI) (HRAC Group N)
- Group 15. Long-Chain Fatty Acid Inhibitors (May also see this referred to as Mitosis Inhibitors (CDI). (HRAC Group K3)
- Group 16. Specific Site Unknown (HRAC Group N)

Review and Reflection

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