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Imazethapyr resistance in common sunflower (Helianthus annuus)

Published online by Cambridge University Press:  12 June 2017

Kassim Al-Khatib ,
Jolene R. Baumgartner ,
Dallas E. Peterson  and
Randall S. Currie
Jolene R. Baumgartner
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Dallas E. Peterson
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Randall S. Currie
Affiliation:
Southwest Research–Extension Center, Kansas State University, Garden City, KS 67846
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Abstract

Resistance to imazethapyr was identified in a population of common sunflower that had been treated with imazethapyr for seven consecutive years. The imazethapyr-resistant biotype of common sunflower was approximately 170 times more resistant to imazethapyr than the susceptible biotype based on the rate required for 25% control. Resistance was due to altered acetolactate synthase (ALS) that is less sensitive to imazethapyr. The imazethapyr concentration required to inhibit in vitro ALS activity by 25% was 210–fold higher in the resistant biotype than in the susceptible biotype. Differences in absorption, translocation, and metabolism of imazethapyr in common sunflower biotypes were not sufficient to explain the resistance to imazethapyr.

Keywords

Imazethapyrcommon sunflower, Helianthus annuus L. HELANHerbicide resistanceherbicide absorptionherbicide translocationherbicide metabolismacetolactate synthaseHELAN
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 46 , Issue 4 , August 1998 , pp. 403 - 407
Copyright
Copyright © 1998 by the Weed Science Society of America 

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