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CATCHWEED BEDSTRAW
(
Galium aparine
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: TRYPTOPHAN 574 to GLYCINE
Catchweed Bedstraw
(
Galium aparine
) is a dicot plant in the rubiaceae family. A single amino acid substitution from Tryptophan 574 to Glycine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Catchweed Bedstraw
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
NOTE
Two additional ALS amino acid substitutions were identified in the R biotype, so it is not certain if the Trp574Gly substitution confers resistance and/or if one of the other substitutions plays a role.
REFERENCES
Sun Jian ; Wang JinXin ; Zhang HongJun ; Liu JunLiang ; Bian ShengNan
.
2011
.
Study on mutations in ALS for resistance to tribenuron-methyl in
Galium aparine
L
.
Agricultural Sciences in China
10
:
86 - 91
.
In recent years,
Galium aparine
L. has not been controlled by tribenuron-methyl in major Chinese winter wheat fields. The objective of this study is to understand the molecular basis of the resistance mechanism to tribenuron-methyl in
G. aparine
and to find the specific mutation sites in amino acid sequence of acetolactate synthase (ALS) in the resistant biotype of
G. aparine
. Fragments that encode the ALS were amplified and cloned from susceptible (S) and resistant (R) biotypes of
G. aparine
to tribenuron-methyl and sequenced subsequently. The result showed that the nucleotide sequence of R-biotype of
G. aparine
differed from that of the S biotype with three amino acid substitutions, of which, the amino acid substitution of Trp
574
(TGG) to Gly (GGG) is located in the highly conserved region Domain B. The substitution of Trp
574
might be responsible for the resistance to tribenuron-methyl in the R-biotype of
G. aparine
.
.
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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