Which herbicide class affects amino acid synthesis?

• A. ACCase inhibitors
• B. ALS inhibitors
• C. HPPD inhibitors
• D. Both A and B

Answer: (D)

The correct answer is that both ACCase inhibitors and ALS inhibitors affect amino acid synthesis.

ACCase inhibitors work by disrupting the biosynthesis of fatty acids, which indirectly influences amino acid production since fatty acids are precursors in the synthesis of certain amino acids. On the other hand, ALS inhibitors specifically target the acetolactate synthase enzyme, which is crucial for the synthesis of branched-chain amino acids, such as leucine, isoleucine, and valine. By inhibiting this enzyme, ALS inhibitors prevent the formation of essential amino acids, leading to plant growth inhibition and eventual death.

This dual action from both classes of herbicides on amino acid biosynthesis supports effective weed control strategies. The other options focus solely on one class or the other without recognizing the combined effects that both ACCase and ALS inhibitors have on amino acid synthesis.