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Enhanced sensitivity to cloransulam-methyl in imidazolinone-resistant smooth pigweed

Published online by Cambridge University Press:  20 January 2017

Daniel H. Poston ,
Jingrui Wu ,
Kriton K. Hatzios  and
Henry P. Wilson
Jingrui Wu
Affiliation:
Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
Kriton K. Hatzios
Affiliation:
Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
Henry P. Wilson
Affiliation:
Eastern Shore Agricultural Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
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Abstract

Several populations of smooth pigweed with resistance to imidazolinone (IMI) herbicides have been identified in recent years. One IMI-resistant population (R2) was 10-fold more sensitive to cloransulam-methyl in the greenhouse when compared with a susceptible (S) population. Laboratory studies were conducted to determine if differences in the absorption, translocation, and metabolism of cloransulam-methyl existed between S and R2 populations and to determine if these differences could account for the whole-plant responses observed in the greenhouse. Enzyme assays were also conducted to determine if differences in acetolactate synthase (ALS) sensitivity to cloransulam-methyl existed between S and R2 populations. Absorption of foliar-applied cloransulam-methyl was rapid and similar in both populations of smooth pigweed. Translocation of the absorbed radioactivity out of the treated leaf was symplastic and generally similar in both populations. Translocated radioactivity was detected primarily in shoots above and below the treated leaf with little movement to the roots. 14C-cloransulam-methyl metabolism was also similar in S and R2 populations. Differential tolerance to cloransulam-methyl in S and R2 populations in the greenhouse cannot be explained by differences in the absorption, translocation, and metabolism of this herbicide. However, ALS from R2 was 25-fold more sensitive to inhibition by cloransulam-methyl than ALS from S.

Keywords

Cloransulam-methylsmooth pigweedAmaranthus hybridus L. AMACHHerbicide resistancenegative cross-resistanceabsorptiontranslocationmetabolismimidazolinone resistanceALS inhibitoracetolactate synthase.
Type
Research Article
Information
Weed Science , Volume 49 , Issue 6 , December 2001 , pp. 711 - 716
Copyright
Copyright © Weed Science Society of America 

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