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POWELL AMARANTH
(
Amaranthus powellii
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: ASPARTATE 376 to GLUTAMATE
Powell Amaranth
(
Amaranthus powellii
) 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.
Powell Amaranth
Chemical Family
Example Herbicide
Resistance Level
Imidazolinones
Imazethapyr
Resistant > 10 fold
Pyrimidinyl benzoates
Bispyribac-Na
Resistant > 10 fold
Sulfonylureas
Chlorsulfuron
Resistant > 10 fold
Triazolopyrimidine - Type 1
Chloransulam-methyl
Resistant > 10 fold
Triazolinones
Flucarbazone-Na
Resistant > 10 fold
REFERENCES
Ashigh, J., C. L. Corbett, P. J. Smith, J. Laplante, And F. J. Tardif.
.
2009
.
Characterization and diagnostic tests of resistance to acetohydroxyacid synthase inhibitors due to an Asp376Glu substitution in Amaranthus powellii
.
Pesticide Biochemistry and Physiology
95
:
38 - 46
.
A population of Amaranthus powellii that had survived imazethapyr did not have any of the documented AHAS mutations causing resistance in this species in Ontario. The goal of this research was to confirm resistance in this population, determine its molecular basis and develop diagnostic tests. Whole plant dose–response experiments showed the resistant population had greater than 25-fold resistance to the selective agent imazethapyr at the whole plant level. Whole plant resistance to other herbicides ranged between 9-fold to flumetsulam and 85-fold to flucarbazone. This was confirmed at the enzyme level with resistance ranging between 25-fold to imazethapyr and 485-fold to thifensulfuron. AHAS from the resistant population had 16% higher specific activity than that of the susceptible population and it was also less sensitive to feedback inhibition by valine, leucine and isoleucine. Genomic DNA was extracted to PCR amplify and sequence the AHAS gene and to determine the applicability of diagnostic tests. Sequencing of the AHAS gene revealed a single point mutation of thymine1125 to guanine coding for an Asp376Glu substitution. Two different diagnostic tests, restriction fragment length polymorphism and PCR amplification of specific allele, were able to correctly identify the resistant population from the susceptible control and from other resistant populations. Although this mutation appears to confer higher resistance to pyrithiobac and flucarbazone, two herbicides not registered in Eastern Canada, it endows plants with enough protection to allow survival to imazethapyr, the main selective agent in Ontario.
.
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.
Friday, November 22, 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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