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COMMON FALSE-PIMPERNEL; AZENA (JAPANESE)
(
Lindernia procumbens
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: PROLINE 197 to GLUTAMINE
Common False-pimpernel; Azena (Japanese)
(
Lindernia procumbens
) is a dicot plant in the scrophulariaceae family. A single amino acid substitution from Proline 197 to Glutamine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Common False-pimpernel; Azena (Japanese)
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
Uchino, A. ; Watanabe, H.
.
2002
.
Mutations in the acetolactate synthase genes of sulfonylurea-resistant biotypes of
Lindernia
spp
.
Weed Biology and Management
2
:
104 - 109
.
Acetolactate synthase (ALS) is a key enzyme in the biosynthetic pathway of branched-chain amino acids. A mutation of the ALS gene causing amino acid substitution at the position of proline in Domain A makes ALS less sensitive to sulfonylureas, which are ALS-inhibiting herbicides. We cloned partial ALS genes from four
Lindernia
plants,
L. dubia
var.
dubia, dubia
var.
major, L. micrantha
, and
L. procumbens
, for which biotypes resistant to sulfonylureas have been found in paddy fields. The clones were classified into two groups in each
Lindernia
plant:
Als1
and
Als2
. Sequencing of the clones and alignment of deduced amino acid sequences with previously reported ALS of other species suggested that the cloned region contains an intron in both
Als1
and
Als2
. The comparison of
Als1
between resistant and susceptible biotypes showed that the proline of Domain A was replaced by alanine, serine, or glutamine in all resistant biotypes of
Lindernia
plants, while it was conserved in all susceptible biotypes. This amino acid substitution in ALS encoded by
Als1
is involved in the resistant mechanism of ALS to sulfonylurea in the four
Lindernia
plants.
.
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, November 23, 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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