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LATE WATERGRASS
(
Echinochloa phyllopogon (=E. oryzicola)
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: TRYPTOPHAN 574 to LEUCINE
Late Watergrass
(
Echinochloa phyllopogon (=E. oryzicola)
) is a monocot plant in the poaceae family. A single amino acid substitution from Tryptophan 574 to Leucine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Late Watergrass
Chemical Family
Example Herbicide
Resistance Level
Imidazolinones
Imazethapyr
Resistant > 10 fold
Pyrimidinyl benzoates
Bispyribac-Na
Resistant > 10 fold
Sulfonylureas
Chlorsulfuron
Resistant > 10 fold
Triazolopyrimidine - Type 1
Chloransulam-methyl
Resistant > 10 fold
Triazolinones
Flucarbazone-Na
Not Determined
REFERENCES
Kaloumenos, N. S. ; Chatzilazaridou, S. L. ; Mylona, P. V. ; Polidoros, A. N. ; Eleftherohorinos, I. G.
.
2013
.
Target-site mutation associated with cross-resistance to ALS-inhibiting herbicides in late watergrass (
Echinochloa oryzicola
Vasing.)
.
Pest Management Science
69
:
865 - 873
.
BACKGROUND: Studies were carried out to elucidate the mechanism of resistance to ALS-inhibiting herbicides in 29
Echinochloa
accessions from water-seeded rice fields of northern Greece and to discriminate the
Echinochloa
species. RESULTS: Two
E. oryzicola
accessions were found to be cross-resistant to penoxsulam, bispyribac-sodium, imazamox, foramsulfuron, nicosulfuron and rimsulfuron, whereas all accessions were susceptible (S) to profoxydim. Sequencing of the
ALS
gene revealed that resistant (R) accessions had a Trp574Leu mutation, which was also confirmed by
Tsp
RI endonuclease digestion. Use of cpDNA sequence comparison analysis of
Echinochloa
species discriminated successfully
E. crus-galli
and
E. oryzicola
accessions. CONCLUSION: This is the first report of
Echinochloa oryzicola
cross-resistance to ALS-inhibiting herbicides as a result of Trp574Leu mutation. The cpDNA sequence comparison analysis is a reliable tool for discrimination of conventionally classified
E. crus-galli
and
E. oryzicola
accessions.
.
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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