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Magnitude of Imazethapyr Resistance of Corn (Zea mays) Hybrids with Altered Acetolactate Synthase

Published online by Cambridge University Press:  12 June 2017

Randall S. Currie
Affiliation:
Kansas State Univ., SW Research-Extension Center, 4500 E. Mary Street, Garden City, KS 67846
Chae S. Kwon
Affiliation:
Dep. of Crop and Soil Sci., Michigan State Univ., E. Lansing, Ml 48824
Donald Penner
Affiliation:
Dep. of Crop and Soil Sci., Michigan State Univ., E. Lansing, Ml 48824

Abstract

A laboratory study was conducted to evaluate the magnitude of imazethapyr resistance of field corn hybrids with altered acetolactate synthase (ALS) by comparing the responses of ALS extracted from homozygous and heterozygous resistant corn to nicosulfuron, primisulfuron, and imazethapyr. ALS isolated from Pioneer 3162 IR, Pioneer 3180 IR, Pioneer 3377 IR, and Ciba 4393 RSC hybrids was much more resistant to inhibition by these herbicides than ALS from the hybrids Pioneer 3162, Pioneer 3180, Pioneer 3377, and Ciba 4393, and the public inbred LH 74. Corn hybrids heterozygous for the Pioneer resistance gene were intermediate in response to the herbicides. ALS from ICI 8532 IT was resistant to imazethapyr but not to primisulfuron or nicosulfuron. The level of resistance of ALS from ICI 8532 IT was similar to that of ALS from Pioneer 3162 IR x Pioneer 3162 and Pioneer 3180 IR x Pioneer 3180 crosses that were also heterozygous for the resistance gene.

Type
Physiology, Chemistry, and Biochemistry
Copyright
Copyright © 1995 by the Weed Science Society of America 

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Magnitude of Imazethapyr Resistance of Corn (Zea mays) Hybrids with Altered Acetolactate Synthase
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