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Physiological Mechanisms in the Synergism between Thifensulfuron and Imazethapyr in Sulfonylurea-Tolerant Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

David M. Simpson  and
E. W. Stoller
David M. Simpson
Affiliation:
Dep. Agron., Univ. Illinois, and Plant Physiol., USDA-ARS, 1102 South Goodwin Ave., Urbana, IL 61801
E. W. Stoller
Affiliation:
Dep. Agron., Univ. Illinois, and Plant Physiol., USDA-ARS, 1102 South Goodwin Ave., Urbana, IL 61801
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Abstract

Greenhouse and laboratory experiments were conducted to determine if the synergistic interaction between imazethapyr and thifensulfuron in sulfonylurea-tolerant (STS) soybean involved enhanced absorption and translocation or reduced metabolism of one or both herbicides. Thifensulfuron at 4.4 g ha−1 and imazethapyr at 70 g ha−1 caused 0 and 28% injury to STS soybean 7 DAT, respectively, while the combination of both herbicides caused 50% injury 7 DAT. Imazethapyr had no effect on absorption of 14C-thifensulfuron into the first trifoliolate. Imazethapyr did not affect absorption, translocation, or metabolism of 14C-thifensulfuron. Metabolism of 14C-thifensulfuron was rapid, with less than 10% remaining after 24 h, and was not affected by imazethapyr. Likewise, thifensulfuron did not affect the absorption, translocation, or metabolism of 14C-imazethapyr. Therefore, the synergism between thifensulfuron and imazethapyr does not involve changes in the absorption, translocation, or metabolism of either herbicide.

Keywords

Imazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methyethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidthifensulfuron, 3-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]-2-thiophenecarboxylic acidsoybean, Glycine max (L.) Merr.AbsorptionimidazolinoneSTS soybeansynergism
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 44 , Issue 2 , June 1996 , pp. 209 - 214
Copyright
Copyright © 1996 by the Weed Science Society of America 

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