Physiological and biochemical investigation of the selectivity of Ethametsulfuron (cas 111353-84-5) in commercial brown mustard and wild mustard

Add time:08/31/2019    Source:sciencedirect.com

Under controlled environment conditions, ED50 values (dose required to reduce growth by 50%) determined from total plant dry weights in response to foliar-applied Ethametsulfuron (cas 111353-84-5) (DPX-A7881; (methyl-2-[(4-ethoxy-6-methylamino-1,3,5-triazin-2-yl)carbamoylsulfonyl]benzoate) were 148 and 0.85 g ai/ha for commercial brown mustard (Brassica juncea) and wild mustard (Sinapis arvensis), respectively. There was little or no difference in absorption of the herbicide between the two plant species, with >95% absorbed after 12 hr in both species. Approximately 8 and 10% of the recovered radioactivity was translacated out of the treated leaf 72 hr after application to commercial brown mustard and wild mustard, respectively. Acetolactate synthase extracted from the two species was equally sensitive to DPX-A7881 (I50 approximately 15 nM), indicating that selectivity was not due to differences in the herbicide target site between the two species. DPX-A7881 was metabolized more rapidly in commercial brown mustard than in wild mustard; approximately 38, 27, 20, 5, 2, and 3.5% of the recovered radioactivity remained as DPX-A7881 in commercial brown mustard and 64, 57, 35, 29, 25, and 19% remained in wild mustard 12, 24, 36, 48, 72, and 96 hr after treatment. Two common metabolites were formed in each species; one of these accounted for 93 and 67% of the extractable 14C activity in commercial brown mustard and wild mustard, respectively, after 72 hr. The second metabolite constituted less than 25% of the recovered 14C activity at all sampling times, with little difference between the two species. It is proposed that this difference in the rate of metabolism of DPX-A7881 may constitute the basis of selectivity of the herbicide between tolerant commercial brown mustard and sensitive wild mustard.

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