Skelton Joshua J, Simpson David M, Peterson Mark A, Riechers Dean E
Department of Crop Sciences, University of Illinois , Urbana, Illinois 61801, United States.
Dow AgroSciences LLC , Indianapolis, Indiana 46268, United States.
J Agric Food Chem. 2017 Jul 26;65(29):5847-5859. doi: 10.1021/acs.jafc.7b00796. Epub 2017 Jul 14.
The Enlist weed control system allows the use of 2,4-D in soybean but slight necrosis in treated leaves may be observed in the field. The objectives of this research were to measure and compare uptake, translocation, and metabolism of 2,4-D in Enlist (E, resistant) and non-AAD-12 transformed (NT, sensitive) soybeans. The adjuvant from the Enlist Duo herbicide formulation (ADJ) increased 2,4-D uptake (36%) and displayed the fastest rate of uptake (U= 0.2 h) among treatments. E soybean demonstrated a faster rate of 2,4-D metabolism (M= 0.2 h) compared to NT soybean, but glyphosate did not affect 2,4-D metabolism. Metabolites of 2,4-D in E soybean were qualitatively different than NT. Applying 2,4-D-ethylhexyl ester instead of 2,4-D choline (a quaternary ammonium salt) eliminated visual injury to E soybean, likely due to the time required for initial de-esterification and bioactivation. Excessive 2,4-D acid concentrations in E soybean resulting from ADJ-increased uptake may significantly contribute to foliar injury.
“Enlist”杂草控制系统允许在大豆中使用2,4-滴，但在田间可能会观察到处理过的叶片出现轻微坏死。本研究的目的是测量和比较2,4-滴在“Enlist”（E，抗性）和未转化AAD-12（NT，敏感）大豆中的吸收、转运和代谢。“Enlist Duo”除草剂配方中的助剂（ADJ）增加了2,4-滴的吸收（36%），并且在各处理中显示出最快的吸收速率（U = 0.2小时）。与NT大豆相比，E大豆表现出更快的2,4-滴代谢速率（M = 0.2小时），但草甘膦不影响2,4-滴的代谢。E大豆中2,4-滴的代谢产物在质量上与NT大豆不同。施用2,4-滴-乙基己酯而非2,4-滴胆碱（一种季铵盐）消除了对E大豆的可见损伤，这可能是由于初始脱酯和生物活化所需的时间。ADJ增加的吸收导致E大豆中2,4-滴酸浓度过高，可能是造成叶片损伤的重要原因。
