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INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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MAYWEED CHAMOMILE
(
Anthemis cotula
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: PROLINE 197 to LEUCINE
Mayweed Chamomile
(
Anthemis cotula
) is a dicot plant in the asteraceae family. A single amino acid substitution from Proline 197 to Leucine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Mayweed Chamomile
Chemical Family
Example Herbicide
Resistance Level
Imidazolinones
Imazethapyr
Intermediate Resistance < 10 fold
Pyrimidinyl benzoates
Bispyribac-Na
Not Determined
Sulfonylureas
Chlorsulfuron
Resistant > 10 fold
Triazolopyrimidine - Type 1
Chloransulam-methyl
Intermediate Resistance < 10 fold
Triazolinones
Flucarbazone-Na
Not Determined
NOTE
Different Pro197 substitutions were present within populations, and therefore specific cross resistance patterns conferred by specific substitutions are confounded.
REFERENCES
Intanon, S. ; Perez-Jones, A. ; Hulting, A. G. ; Mallory-Smith, C. A.
.
2011
.
Multiple Pro
197
ALS substitutions endow resistance to ALS inhibitors within and among mayweed chamomile populations
.
Weed Science
59
:
431 - 437
.
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 (Pro
197
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.
.
This case was entered by Patrick Tranel Email:
tranel@illinois.edu
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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I. The International Herbicide-Resistant Weed Database. Online.
Thursday, October 31, 2024
. Available
www.weedscience.org
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