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Thursday, November 14, 2024
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FLIXWEED
(
Descurainia sophia
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: ASPARTATE 376 to GLUTAMATE
Flixweed
(
Descurainia sophia
) is a dicot plant in the brassicaceae 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.
Flixweed
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
Intermediate Resistance < 10 fold
Triazolinones
Flucarbazone-Na
Not Determined
REFERENCES
Xu, X., G. Liu, S. Chen, B. Li, X. Liu, X. Wang, C. Fan, G. Wang, and H. Ni
.
2015
.
Mutation at residue 376 of ALS confers tribenuron-methyl resistance in flixweed (
Descurainia sophia
) populations from Hebei Province, China.
.
Pesticide Biochemistry and Physiology
125
:
62 - 68
.
The acetolactate synthase (ALS) inhibitor tribenuron has been used continuously for approximately twenty years as an herbicide in winter wheat fields in China. Flixweed (
Descurainia sophia
) has evolved resistance to tribenuron, due to multiple amino acid mutations at the 197th residue of ALS. In this study, the molecular basis of tribenuron resistance was investigated using two resistant populations, Xingtai (XT) and Shijiazhuang (SJ), and two susceptible populations, Cangzhou (CZ) and Handan (HD). Whole-plant tests and ALS activity assays showed that the two resistant populations were highly resistant to tribenuron. Targeted amplification of ALS genes from the four populations showed that there were two ALS genes in each population, and both of them were expressed in flixweed; the full coding lengths of the two ALS genes were 1998 bp and 2004 bp. Mutations related to tribenuron resistance in flixweed were located in only the 1998 bp paralog. An ALS activity assay showed that the resistant population SJ displayed slight cross-resistance to florasulam, with a resistance factor of 4.81, but the resistant population XT did not have cross-resistance to florasulam. The resistant population XT was found to carry the previously reported mutation Pro197Ser, but the resistant population SJ carried a different mutation, Asp376Glu, known from other weeds but novel in flixweed. Our results demonstrated that multiple versions of ALS genes exist in flixweed and that mutations at multiple sites may result in ALS-inhibitor resistance in this weed.
.
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.
Thursday, November 14, 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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