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INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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WILD OAT
(
Avena fatua
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: SERINE 653 to THREONINE
Wild Oat
(
Avena fatua
) is a monocot plant in the poaceae family. A single amino acid substitution from Serine 653 to Threonine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Wild Oat
Chemical Family
Example Herbicide
Resistance Level
Imidazolinones
Imazethapyr
Resistant > 10 fold
Pyrimidinyl benzoates
Bispyribac-Na
Not Determined
Sulfonylureas
Chlorsulfuron
Not Determined
Triazolopyrimidine - Type 1
Chloransulam-methyl
Not Determined
Triazolinones
Flucarbazone-Na
Not Determined
NOTE
The cross-resistance pattern may be obscured by the co-occurrence of non-target-site resistance in the population (see Beckie et al. 2012).
REFERENCES
Beckie, H. J. ; Warwick, S. I. ; Sauder, C. A.
.
2012
.
Basis for herbicide resistance in Canadian populations of wild oat (
Avena fatua
)
.
Weed Science
60
:
10 - 18
.
Wild oat is the second-most abundant, but most economically important, weed across the Canadian Prairies of western Canada. Despite the serious economic effects of resistance to acetyl-CoA carboxylase (ACC) or acetolactate synthase (ALS) inhibitors or both in this weed throughout the Northern Great Plains of North America, little research has examined the basis for herbicide resistance. We investigated target-site and nontarget-site mechanisms conferring ACC- and ALS-inhibitor resistance in 16 wild oat populations from across western Canada (four ACC-inhibitor resistant, four ALS-inhibitor resistant, and eight ACC- and ALS-inhibitor resistant). The
ACC1
mutations were found in 8 of the 12 ACC inhibitor-resistant populations. The Ile1781Leu mutation was detected in three populations, the Trp2027Cys and Asp2078Gly mutations were in two populations each, and the Trp1999Cys, Ile2041Asn, Cys2088Arg, and Gly2096Ser substitutions were in one population each. Three populations had two
ACC1
mutations. Only 2 of the 12 ALS inhibitor-resistant populations had an
ALS
target-site mutation - Ser653Thr and Ser653Asn substitutions. This is the first global report of
ALS
target-site mutations in
Avena
spp. and four previously undocumented
ACC1
mutations in wild oat. Based on these molecular analyses, seedlings of five ACC+ALS inhibitor-resistant populations (one with an
ACC1
mutation; four with no
ACC
or
ALS
mutations) were treated with malathion, a known cytochrome P450 monooxygenase inhibitor, followed by application of one of four ACC- or ALS-inhibiting herbicides. Malathion treatment often resulted in control or suppression of these populations, suggesting involvement of this enzyme system in contributing to resistance to both ACC and ALS inhibitors.
.
This case was entered by Patrick Tranel Email:
tranel@illinois.edu
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Heap, I. The International Herbicide-Resistant Weed Database. Online.
Saturday, September 7, 2024
. Available
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