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Penoxsulam is a triazolopyrimidine sulfonamide herbicide primarily used for post-emergence weed control in rice crops. Its mechanism of action involves inhibiting acetolactate synthase (ALS), an enzyme crucial for the biosynthesis of branched-chain amino acids in plants. Resistance to penoxsulam has been observed in certain weed species, such as Echinochloa crus-galli, where both target-site resistance (TSR) and non-target-site resistance (NTSR) mechanisms have been identified. These mechanisms include mutations in the ALS gene and enhanced metabolic degradation facilitated by enzymes like glutathione transferases. The resistance can be further influenced by factors such as germination fitness and cross-resistance to other ALS inhibitors. Understanding these resistance mechanisms is essential for developing effective management strategies for penoxsulam-resistant weed populations.
仅用于科研。不用于诊断过程。未经明确授权不得转售。