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Saturday, September 7, 2024
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DOWNY BROME (CHEATGRASS)
(
Bromus tectorum
)
with
GROUP C1/5 resistance: (PSII INHIBITORS - SERINE 264 BINDERS )
Inhbition of Photosynthesis at PSll - Serine 264 Binders
MUTATION: PROLINE 197 to SERINE
Downy Brome (Cheatgrass)
(
Bromus tectorum
) is a monocot plant in the poaceae family. A single amino acid substitution from Proline 197 to Serine has led to resistance to PSII inhibitors - Serine 264 Binders as indicated in the table below.
Downy Brome (Cheatgrass)
Chemical Family
Example Herbicide
Resistance Level
Imidazolinones
Imazethapyr
Susceptible
Pyrimidinyl benzoates
Bispyribac-Na
Not Determined
Sulfonylureas
Chlorsulfuron
Resistant > 10 fold
Triazolopyrimidine - Type 1
Chloransulam-methyl
Not Determined
Triazolinones
Flucarbazone-Na
Resistant > 10 fold
Triazolinone
Amicarbazone
Not Determined
REFERENCES
Park, K. W. ; Mallory-Smith, C. A.
.
2004
.
Physiological and molecular basis for ALS inhibitor resistance in
Bromus tectorum
biotypes
.
Weed Research (Oxford)
44
:
71 - 77
.
Primisulfuron-resistant (AR and MR) and -susceptible (AS and MS)
Bromus tectorum
biotypes were collected from a
Poa pratensis
field at Athena, Oregon, and in research plots at Madras, Oregon. Studies were conducted to characterize the resistance of the
B. tectorum
biotypes. Whole plant bioassay and acetolactate synthase (ALS) enzyme assay revealed that the AR biotype was highly resistant to the sulfonylurea (SU) herbicides, primisulfuron and sulfosulfuron and to a sulfonylaminocarbonyltriazolinone (SCT) herbicide, propoxycarbazone-sodium. However, the AR biotype was not resistant to imazamox, an imidazolinone (IMI) herbicide. Results of the whole plant bioassay studies showed that the MR biotype was moderately resistant to all ALS inhibitors tested. However, there were no differences in ALS sensitivities between the MR and MS biotypes. The nucleotide and amino acid sequence analysis of the
als
gene demonstrated a single-point mutation from C to T, conferring the exchange of the amino acid proline to serine at position 197 in the AR biotype. However, this mutation was not found in the MR biotype. Results of this research indicate that: the resistance of the AR biotype to SU and SCT herbicides is based on an altered target site due to a single-point mutation; resistance in the MR biotype is not due to a target site mutation.
.
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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