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KOCHIA
(
Kochia scoparia
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: PROLINE 197 to ALANINE
Kochia
(
Kochia scoparia
) is a dicot plant in the chenopodiaceae family. A single amino acid substitution from Proline 197 to Alanine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Kochia
Chemical Family
Example Herbicide
Resistance Level
Imidazolinones
Imazethapyr
Not Determined
Pyrimidinyl benzoates
Bispyribac-Na
Not Determined
Sulfonylureas
Chlorsulfuron
Resistant > 10 fold
Triazolopyrimidine - Type 1
Chloransulam-methyl
Not Determined
Triazolinones
Flucarbazone-Na
Not Determined
REFERENCES
Guttieri, M. J. ; Eberlein, C. V. ; Thill, D. C.
.
1995
.
Diverse mutations in the acetolactate synthase gene confer chlorsulfuron resistance in kochia (
Kochia scoparia
) biotypes
.
Weed Science
43
:
175 - 178
.
The DNA sequence of an 83-base pair region of the acetolactate synthase (ALS) gene was compared for 10 chlorsulfuron-resistant (R) and 3 chlorsulfuron-susceptible (S) kochia biotypes. Point mutation in the codon for the proline residue at position 173 in Domain A of the ALS protein was observed in 7 of 10 R biotypes. Among these 7 R biotypes, mutation to threonine, serine, arginine, leucine, glutamine and alanine was identified. The mechanism of resistance was determined for the R biotypes that did not have mutation in Domain A; all were resistant due to modified ALS, which indicated that at least one non-Domain A mutation site for resistance exists in kochia. Sequence results indicated that multiple mutations for resistance have occurred and that geographically widespread ALS-inhibitor resistance in kochia is not the result of a single resistance allele.
.
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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