Target Sites for Herbicide Action

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Carotenoid Biosynthesis. Other Primary Target Sites for Herbicides.

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Modifiers of Herbicide Action at Target Sites. Pathways and Mechanisms of Transport of Herbicides in Plants. Herbicide Metabolism as a Basis for Selectivity. Du kanske gillar. Lifespan David Sinclair Inbunden. A metabolite of cyclopyrimorate, des-morpholinocarbonyl cyclopyrimorate DMC , was detected in plants.

In vitro assays showed that A.

DMC derivatives showed a positive correlation between HST inhibition and in vivo bleaching activities. These results indicate that the target site of cyclopyrimorate and DMC is HST, a novel target site of commercial herbicides.

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Altered target site:

In Portulaca oleacea a Ser to threonine substitution provided resistance to the phenylurea, linuron, and to the symmetrical triazine herbicide families. Maternal inheritance decreases the movement of the resistance trait because it is not moved with pollen.

How Do You Know that a Weed is TARGET-SITE Resistant?

The mutation reduces the efficiency of photosynthesis in resistant plants, which results in reduced fitness. Microtubule Assembly Resistance Dinitroanaline herbicides, such as prodiamide, oryzalin, and trifluralin, bind to tubulin and block the formation of microtubules, which are important in cell division. Dinitroanaline resistance has been reported to be controlled by a single, recessive nuclear gene.

Herbicides as Probes in Plant Biology

This is in contrast to most reports of herbicide resistance being controlled by a dominant or semi-dominant gene. Since the dinitroanaline resistance trait is recessive, it will take longer for it to build up in the population because only homozygous recessive plants will be resistant to the herbicide. In the following tables Punnett Squares , the shaded cells are the plants that would survive herbicide treatment. ALS is the first common enzyme in the biochemical pathway that produces the branched chain amino acids.

Target Sites for Herbicide Action

Multiple mutations are responsible for ALS resistance. For example, mutations in the gene that encodes ALS which result in any one of five different amino acids changes will result in resistance to the ALS inhibitors. The particular mutation determines to which ALS inhibitor family the weed will be resistant.

For example, a change in Pro provides high resistance to the sulfonylurea herbicides but not to the imidazolinone herbicides. A substitution at Ala results in resistance to only the imidazolinone herbicides. A Trp mutation provides resistance to both classes of herbicides.


The mechanisms of herbicide resistance

It is possible to have more than one mutation in the ALS gene which provides a greater level of resistance to multiple ALS inhibitor families. The different resistance patterns for ALS inhibitors suggest that the binding sites for the different families of herbicides are not identical but rather they bind to different areas of the herbicide binding site.

R, and Heap, I. ALS mutations from herbicide-resistant weeds. Available www.