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Acetolactate Synthase Resistance in a Common Waterhemp (Amaranthus rudis) Population

Published online by Cambridge University Press:  12 June 2017

John R. R. Hinz  and
Micheal D. K. Owen
John R. R. Hinz
Affiliation:
Dep. of Agron., Iowa State Univ., Ames, IA 50011
Micheal D. K. Owen
Affiliation:
Dep. of Agron., Iowa State Univ., Ames, IA 50011
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Abstract

Research was initiated to determine (a) whether a common waterhemp population was resistant to acetolactate synthase (ALS) inhibiting herbicides, (b) the percentage of the population that was ALS-inhibitor resistant, (c) the resistance mechanism, and (d) the effectiveness of a whole plant assay to detect ALS-inhibitor resistance. ALS-inhibitor resistance was confirmed in a common waterhemp population near Davis City, IA. The Davis City common waterhemp population was cross resistant to both imidazolinone and sulfonylurea herbicides, but not to lactofen. Approximately 10% of the Davis City common waterhemp population was sensitive to a rate of imazaquin 4 times the normal field rate. Davis City common waterhemp isolated ALS was much less sensitive to imazaquin and primisulfuron inhibition than was grain amaranth or an ALS-sensitive common waterhemp isolated ALS. Imazaquin I50 values were 366.4 and 3.4 μM for ALS isolated from Davis City common waterhemp and grain amaranth, respectively. Primisulfuron I50 values were 3.6 and 0.007 μM for ALS isolated from Davis City common waterhemp and grain amaranth, respectively. A whole plant ALS assay was developed that allowed for much more rapid detection of an ALS-resistant species and used less plant material than a conventional ALS assay.

Keywords

Imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidlactofen, (±)-2-ethoxy-1-methyl-2-oxoethyl 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoateprimisulfuron, 2-[[[[[4,6-bis(difluoromethoxy)-2-primydinyl]amino]carbonyl]amino]sulfonyl]benzoic acidcommon waterhemp, Amaranthus rudis Sauer # AMATAgrain amaranth, Amaranthus hypochondriacus L.ALSherbicide resistanceAMATA
Type
Research
Information
Weed Technology , Volume 11 , Issue 1 , March 1997 , pp. 13 - 18
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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