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REDROOT PIGWEED
(
Amaranthus retroflexus
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: ASPARTATE 376 to GLUTAMATE
Redroot Pigweed
(
Amaranthus retroflexus
) is a dicot plant in the amaranthaceae family. A single amino acid substitution from Aspartate 376 to Glutamate 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
Huang, Z., J. Chen, C. Zhang, H. Huang, S. Wei, X. Zhou, J. Chen, and X. Wang
.
2016
.
Target-site basis for resistance to imazethapyr in redroot amaranth (
Amaranthus retroflexus
L.).
.
Pesticide Biochemistry and Physiology
128
:
10 - 15
.
Experiments were conducted to confirm imazethapyr resistance in redroot amaranth (
Amaranthus retroflexus
L.) and study the target-site based mechanism for the resistance. Whole-plant response experiments revealed that the resistant (R) population exhibited 19.16 fold resistance to imazethapyr compared with the susceptible (S) population.
In vitro
ALS activity assay demonstrated that the imazethapyr I
50
value of the R population was 21.33 times greater than that of the S population. However, qRT-PCR analysis revealed that there is no difference in ALS gene expression between the R and S populations. Sequence analysis revealed an Asp-376-Glu substitution in ALS in the R population. In order to verify that the imazethapyr resistance was conferred by Asp-376-Glu mutation, the
ALS-R
and
ALS-S
genes were fused to the CaMV 35S promoter and introduced into Arabidopsis respectively. The expression of
ALS-R
in transgenic Arabidopsis plants exhibited 13.79 fold resistance to imazethapyr compared to
ALS-S
transgenic Arabidopsis.
.
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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