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REDROOT PIGWEED
(
Amaranthus retroflexus
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: ALANINE 122 to THREONINE
Redroot Pigweed
(
Amaranthus retroflexus
) is a dicot plant in the amaranthaceae family. A single amino acid substitution from Alanine 122 to Threonine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Redroot Pigweed
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
REFERENCES
McNaughton, K. E. ; Letarte, J. ; Lee, E. A. ; Tardif, F. J.
.
2005
.
Mutations in
ALS
confer herbicide resistance in redroot pigweed (
Amaranthus retroflexus
) and Powell amaranth (
Amaranthus powellii
)
.
Weed Science
53
:
17 - 22
.
A number of redroot pigweed and Powell amaranth populations from various locations in Ontario, Canada, have distinct patterns of resistance to the acetolactate synthase-inhibiting herbicides imazethapyr and thifensulfuron. This suggested the presence of diverse
ALS
gene mutations among these populations. Seven polymerase chain reaction primer pairs were used to amplify the gene to obtain full sequence information and to determine the identity of resistance-conferring mutations. There was a high degree of similarity in the
ALS
gene of the two species with only five nucleotides and one amino acid differing. A total of four herbicide resistance-conferring mutations were identified in the two species. The Ala
122
Thr, Ala
205
Val, and Trp
574
Leu amino acid substitutions were found in redroot pigweed whereas Ala
122
Thr, Trp
574
Leu, and Ser
653
Thr were detected in Powell amaranth. The pattern of resistance known to be conferred by the mutations concurred with the resistance level observed at the whole plant level. Distinct mutations being found in geographically separated populations suggest that selection for resistance occurred simultaneously in different locations. It reinforces the fact that resistance to ALS inhibitors is easily selected and that growers need to take this into account when formulating weed management strategies.
.
This case was entered by Patrick Tranel Email:
tranel@illinois.edu
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as:
Heap, I. The International Survey of Herbicide Resistant Weeds. Online. Internet.
Saturday, September 7, 2024
. Available
www.weedscience.org
Copyright � 1993-
2024
WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.
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