Question

Correctly match the herbicide with its mode of development of resistance in plants.

 

• A. P-2; Q-1; R-4
• B. P-2; Q-1; R-3
• C. P-1; Q-2; R-3
• D. P-4; Q-1; R-3

Hint:

Understanding herbicide resistance mechanisms is crucial in designing effective weed management strategies and mitigating resistance development.

Answer 1

The Correct Option is A

Step 1: Understand the herbicide resistance mechanisms.

Imidazolinones (P): Herbicides that target acetolactate synthetase (ALS). Resistance is achieved through transformation with a resistant version of ALS.

Bromoxynil (Q): Inhibits photosynthesis. Resistance is developed via transformation with the bacterial nitrilase gene.

Glufosinate (R): Inhibits glutamine synthetase. Resistance is conferred through transformation with the bar gene from Streptomyces hygroscopicus, which encodes phosphinothricin acetyltransferase.

Step 2: Match the herbicides with their resistance mechanisms.

P - 2: Imidazolinones → Resistant version of acetolactate synthetase
Q - 1: Bromoxynil → Bacterial nitrilase gene
R - 4: Glufosinate → bar gene from Streptomyces hygroscopicus

Final Answer:
The correct answer is \( \boxed{(A)} \).