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1 July 2011 Multiple Pro197 ALS Substitutions Endow Resistance to ALS Inhibitors within and among Mayweed Chamomile Populations
Suphannika Intanon, Alejandro Perez-Jones, Andrew G Hulting, Carol A Mallory-Smith
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Abstract

Mayweed chamomile seeds were collected from six different fields across the Pacific Northwest. All populations (each collection site was considered a population) were suspected to have some level of acetolactate synthase (ALS) resistance. Greenhouse and laboratory studies were conducted to determine if these populations were resistant to three different classes of ALS inhibitors: sulfonylureas (SU), imidazolinones (IMI), and triazolopyrimidines (TP). A whole-plant dose–response and in vitro ALS activity studies confirmed cross-resistance to thifensulfuron   tribenuron/chlorsulfuron (SU), imazethapyr (IMI), and cloransulam (TP); however, resistance varied by herbicide class and population. Two ALS isoforms of the ALS gene (ALS1 and ALS2) were identified in mayweed chamomile; however, only mutations in ALS1 were responsible for resistance. No mutations were found in ALS2. Sequence analysis of the partial ALS gene identified four point mutations at position 197 (Pro197 to Leu, Gln, Thr, or Ser) in the resistant populations. This study demonstrates genotypic variation associated with cross-resistance to ALS inhibitors within and between populations.

Nomenclature: Thifensulfuron   tribenuron; chlorsulfuron; imazethapyr; cloransulam; mayweed chamomile, Anthemis cotula L. ANTCO; wheat, Triticum aestivum L. TRZAX.

Weed Science Society of America
Suphannika Intanon, Alejandro Perez-Jones, Andrew G Hulting, and Carol A Mallory-Smith "Multiple Pro197 ALS Substitutions Endow Resistance to ALS Inhibitors within and among Mayweed Chamomile Populations," Weed Science 59(3), 431-437, (1 July 2011). https://doi.org/10.1614/WS-D-10-00146.1
Received: 1 October 2010; Accepted: 1 March 2011; Published: 1 July 2011
JOURNAL ARTICLE
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KEYWORDS
ALS
ALS inhibitors
Herbicide resistance
mayweed chamomile
target-site
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