Question:
Glufosinate inhibits the enzyme
Glufosinate inhibits the enzyme
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Do not confuse Glufosinate with Glyphosate.
- Glufosinate \(\rightarrow\) Inhibits Glutamine Synthetase (GS).
- Glyphosate \(\rightarrow\) Inhibits EPSP Synthase.
- Glufosinate \(\rightarrow\) Inhibits Glutamine Synthetase (GS).
- Glyphosate \(\rightarrow\) Inhibits EPSP Synthase.
Updated On: Aug 5, 2026
- Glutamine synthatase
- EPSP
- ACCase
- PPO
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Herbicides are classified into different families based on their specific site of action (the enzyme or biochemical pathway they inhibit in the plant).
Step 2: Detailed Explanation:
Let us examine the target enzymes for the options provided:
- Option (A) Glutamine synthetase: This is the target enzyme for glufosinate (also known as phosphinothricin).
Glutamine synthetase (GS) is responsible for converting ammonia and glutamate into glutamine.
Inhibiting this enzyme leads to a rapid accumulation of toxic ammonia levels within plant tissues, while simultaneously depleting the amino acids needed for photosynthesis, causing rapid cell death.
- Option (B) EPSP synthase: This enzyme (5-enolpyravylshikimate-3-phosphate synthase) is the target of glyphosate, which blocks the synthesis of aromatic amino acids.
- Option (C) ACCase: Acetyl-CoA carboxylase is inhibited by "fops" and "dims" (such as fenoxaprop and sethoxydim), blocking fatty acid synthesis.
- Option (D) PPO: Protoporphyrinogen oxidase is inhibited by diphenyl ethers and triazolinones (such as oxyfluorfen and carfentrazone), disrupting chlorophyll synthesis.
Therefore, glufosinate specifically inhibits glutamine synthetase.
Step 3: Final Answer:
The correct option is (A).
Herbicides are classified into different families based on their specific site of action (the enzyme or biochemical pathway they inhibit in the plant).
Step 2: Detailed Explanation:
Let us examine the target enzymes for the options provided:
- Option (A) Glutamine synthetase: This is the target enzyme for glufosinate (also known as phosphinothricin).
Glutamine synthetase (GS) is responsible for converting ammonia and glutamate into glutamine.
Inhibiting this enzyme leads to a rapid accumulation of toxic ammonia levels within plant tissues, while simultaneously depleting the amino acids needed for photosynthesis, causing rapid cell death.
- Option (B) EPSP synthase: This enzyme (5-enolpyravylshikimate-3-phosphate synthase) is the target of glyphosate, which blocks the synthesis of aromatic amino acids.
- Option (C) ACCase: Acetyl-CoA carboxylase is inhibited by "fops" and "dims" (such as fenoxaprop and sethoxydim), blocking fatty acid synthesis.
- Option (D) PPO: Protoporphyrinogen oxidase is inhibited by diphenyl ethers and triazolinones (such as oxyfluorfen and carfentrazone), disrupting chlorophyll synthesis.
Therefore, glufosinate specifically inhibits glutamine synthetase.
Step 3: Final Answer:
The correct option is (A).
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