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THREELEAF ARROWHEAD
(
Sagittaria trifolia
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: PROLINE 197 to SERINE
Threeleaf Arrowhead
(
Sagittaria trifolia
) is a monocot plant in the alismataceae family. A single amino acid substitution from Proline 197 to Serine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Threeleaf Arrowhead
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
REFERENCES
Satoshi, I., H. Watanabe, T. Miura, H. Matsumoto, A. Uchino.
.
2014
.
Occurrence of sulfonylurea resistance in
Sagittaria trifolia
, a basal monocot species, based on target-site and non-target-site resistance
.
Weed Biology and Management
14
:
43 - 49
.
Sagittaria trifolia
L. is one of the most serious weeds in paddy fields in Japan. Since the late 1990s, severe infestations of
S. trifolia
have occurred following applications of sulfonylurea herbicides in Akita prefecture. In this study, two accessions of
S. trifolia
, R1 and R2, were collected from paddy fields with severe infestations and their resistance profiles were determined in comparison to a susceptible accession, S1. R1 and R2 were highly resistant to bensulfuron-methyl. R1 was also highly resistant to pyrazosulfuron-ethyl, but R2 was susceptible. Relative to S1, R1 had an amino acid substitution at the Pro
197
residue of acetolactate synthase (ALS), a well-known mutation that confers sulfonylurea resistance, suggesting that R1 has a target-site-based resistance (TSR) mechanism. The sequence of the ALS gene in R2 was identical to that in S1. A Southern blot analysis indicated that there was only one copy of the ALS gene in S1 and R2. These results suggest that R2 has a non-target-site-based resistance (NTSR) mechanism. R2 was moderately resistant to imazosulfuron but susceptible to thifensulfuron-methyl. R2 and S1 were susceptible to pretilachlor, benfuresate, MCPA-ethyl and bentazon. The results reveal the occurrence of two sulfonylurea-resistant biotypes of
S. trifolia
that show different mechanisms of cross-resistance to sulfonylureas related to TSR in R1 and NTSR in R2.
.
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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