Tribenuron

Tribenuron is a sulfonylurea herbicide that is used to control broadleaf weeds in cereal crops. It is a systemic herbicide that is absorbed by the roots and foliage, and translocated throughout the plant. The compound inhibits the enzyme acetolactate synthase, which is involved in the synthesis of the amino acids leucine, isoleucine, and valine. This inhibition leads to a cessation of cell division and plant growth.

Chemistry

Tribenuron is a sulfonylurea compound, which is a class of herbicides that are known for their high efficacy and low application rates. The chemical formula of tribenuron is C14H17N5O6S. It is a white crystalline solid that is soluble in water and most organic solvents. The compound is stable under normal conditions, but it can decompose when exposed to high temperatures.

Mode of Action

Tribenuron acts by inhibiting the enzyme acetolactate synthase (ALS). This enzyme is crucial for the synthesis of the amino acids leucine, isoleucine, and valine. When ALS is inhibited, these amino acids cannot be produced, which leads to a cessation of cell division and plant growth. This mode of action is specific to plants, and tribenuron has low toxicity to mammals.

Use in Agriculture

Tribenuron is used in cereal crops such as wheat, barley, and oats to control broadleaf weeds. It is applied post-emergence, and it is effective against a wide range of weed species. The compound is absorbed by the roots and foliage of the weeds, and it is translocated throughout the plant, leading to its death.

Environmental Impact

Tribenuron is considered to be environmentally friendly due to its low application rates and its specificity to plants. However, like all herbicides, it can have negative impacts on non-target species if not used properly. It is important to follow label instructions when using tribenuron to minimize its environmental impact.

See Also

• Sulfonylurea
• Herbicide
• Acetolactate synthase
• Amino acid synthesis

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