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Multiple herbicide resistance in downy brome (Bromus tectorum) and its impact on fitness

Published online by Cambridge University Press:  20 January 2017

Kee Woong Park  and
Carol A. Mallory-Smith
Carol A. Mallory-Smith
Affiliation:
Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331-3002
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Abstract

Enhanced herbicide metabolism is less common than target site–based herbicide resistance in weeds and often confers resistance to chemically dissimilar herbicides. In a previous study, the mechanism of acetolactate synthase (ALS)-inhibitor resistance in a downy brome biotype was determined to be metabolism. Our research was aimed at determining the multiple resistance pattern in the downy brome biotype, establishing its physiological basis, and investigating its fitness. Dose–response experiments showed that the resistant biotype was also moderately resistant to ethofumesate, clethodim, fluazifop, diuron, and terbacil and highly resistant to the triazine herbicides, atrazine and metribuzin. DNA sequence analysis of the psbA gene, which is the target site of PSII inhibitors, demonstrated a single amino acid substitution from serine to glycine in the resistant biotype at residue 264 in the D1 protein. Thus, the resistant biotype contains two different resistance mechanisms, herbicide metabolism and an altered target site. The resistant biotype produced less shoot dry weight, leaf area, and seed and was shorter than the susceptible biotype. The resistant biotype was also less competitive than the susceptible biotype. Thus, in the absence of herbicides, the frequency of this resistant biotype is unlikely to increase in a population of mixed downy brome biotypes.

Keywords

Atrazine, clethodim, diuron, ethofumesate, fluazifop, metribuzin, terbacildowny brome, Bromus tectorum L. BROTECompetitionfitnessmultiple resistancepsbA gene

Information

Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 53 , Issue 6 , December 2005 , pp. 780 - 786
Copyright
Copyright © Weed Science Society of America 

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