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HARE BARLEY
(
Hordeum murinum ssp. leporinum
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: PROLINE 197 to THREONINE
Hare Barley
(
Hordeum murinum ssp. leporinum
) is a monocot plant in the poaceae family. A single amino acid substitution from Proline 197 to Threonine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Hare Barley
Chemical Family
Example Herbicide
Resistance Level
Imidazolinones
Imazethapyr
Intermediate Resistance < 10 fold
Pyrimidinyl benzoates
Bispyribac-Na
Not Determined
Sulfonylureas
Chlorsulfuron
Resistant > 10 fold
Triazolopyrimidine - Type 1
Chloransulam-methyl
Not Determined
Triazolinones
Flucarbazone-Na
Not Determined
REFERENCES
Owen, M. J. ; Goggin, D. E. ; Powles, S. B.
.
2012
.
Identification of resistance to either paraquat or ALS-inhibiting herbicides in two Western Australian
Hordeum leporinum
biotypes
.
Pest Management Science
68
:
757 - 763
.
BACKGROUND:
Hordeum
populations are becoming increasingly difficult to control in cropping fields. Two herbicide-resistant
H. leporinum
populations were identified during a random crop survey after herbicides were applied. The study aimed to determine the herbicide resistance profile of these
H. leporinum
biotypes to a range of herbicides used for their control. RESULTS: Based on dose-response studies, one
H. leporinum
population was very highly resistant to sulfosulfuron and sulfometuron (both sulfonylurea herbicides) and also displayed low-level resistance to imazamox (an imidazolinone herbicide). Reduced sensitivity of the ALS enzyme was identified with
in vitro
activity assays. Gene sequence analysis revealed a proline-to-threonine substitution at amino acid position 197 of ALS, which is likely to be the molecular basis for resistance in this population. Herbicide screening also revealed a different
H. leporinum
population with resistance to the bipyridyl herbicide paraquat. CONCLUSION: This study established the first cases of (1) sulfonylurea-to-imidazolinone cross-resistance and (2) field-evolved paraquat resistance in a
Hordeum
species in Western Australia.
.
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.
Friday, November 22, 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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