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TALL WATERHEMP
(
Amaranthus tuberculatus (=A. rudis)
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: SERINE 653 to THREONINE
Tall Waterhemp
(
Amaranthus tuberculatus (=A. rudis)
) is a dicot plant in the amaranthaceae 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.
Tall Waterhemp
Chemical Family
Example Herbicide
Resistance Level
Imidazolinones
Imazethapyr
Resistant > 10 fold
Pyrimidinyl benzoates
Bispyribac-Na
Not Determined
Sulfonylureas
Chlorsulfuron
Susceptible
Triazolopyrimidine - Type 1
Chloransulam-methyl
Susceptible
Triazolinones
Flucarbazone-Na
Not Determined
REFERENCES
Patzoldt, W. L. ; Tranel, P. J.
.
2007
.
Multiple ALS mutations confer herbicide resistance in waterhemp (
Amaranthus tuberculatus
)
.
Weed Science
55
:
421 - 428
.
Herbicide responses among Illinois waterhemp half-sib populations were studied. Several of these populations exhibited varying responses to imazethapyr and thifensulfuron, two acetolactate synthase (ALS)-inhibiting herbicides. Plants from two waterhemp populations were identified to be resistant to imazethapyr but susceptible to chlorimuron using a nondestructive leaf-disc assay. Sequencing of the ALS gene revealed that imazethapyr-resistant waterhemp plants from both populations had inferred amino acid substitutions at position 653 of ALS. Depending on the population, serine at position 653 of ALS was substituted with either asparagine (S653N) or threonine (S653T). Waterhemp lines were derived from each population to create uniformly imidazolinone-resistant (IR) waterhemp biotypes, designated IR-62 and IR-101. The ALS-inhibitor responses of each IR biotype were compared with a previously identified ALS inhibitor-resistant biotype with a tryptophan to leucine substitution at position 574 (W574L) and a herbicide-susceptible control. Whole-plant rate-response experiments with waterhemp biotypes containing W574L, S653N or S653T mutations indicated that each biotype was resistant to imazethapyr, but only the biotype with a W574L mutation was resistant to thifensulfuron.
In vitro
ALS-activity assays revealed unique patterns of cross resistance among protein extracts derived from each biotype in response to imazethapyr, thifensulfuron, cloransulam and pyrithiobac. Three different forms of target-site-based resistance to ALS inhibitors were identified in waterhemp.
.
Patzoldt, W. L. And P. Tranel J.
.
2001
.
ALS mutations conferring herbicide resistance in waterhemp
.
Proceedings of the North Central Weed Science Society
56
:
67
.
.
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, December 21, 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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