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ARROWLEAFED MONOCHORIA
(
Monochoria vaginalis
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: ASPARTATE 376 to GLUTAMATE
Arrowleafed Monochoria
(
Monochoria vaginalis
) is a monocot plant in the pontederiaceae family. A single amino acid substitution from Aspartate 376 to Glutamate has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Arrowleafed Monochoria
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
Imaizumi, T. ; Wang, G. X. ; Ohsako, T. ; Tominaga, T.
.
2008
.
Genetic diversity of sulfonylurea-resistant and -susceptible
Monochoria vaginalis
populations in Japan
.
Weed Research (Oxford)
48
:
187 - 196
.
Monochoria vaginalis
is one of the most serious weeds of rice fields in Asia. The species is predominantly selfing. To reveal the potential for multiple mutational events, outcrossing and gene flow in the sulfonylurea-resistant (SU-R)
M. vaginalis
populations, we investigated (i) if each SU-R population was a single SU-R biotype or a mixture of several SU-R biotypes using restriction analysis or direct sequencing of acetolacatate synthase (ALS) genes and (ii) genetic diversity of SU-R and -susceptible (S) populations using amplified fragment length polymorphism (AFLP) analysis. Nineteen or 20 individuals were sampled from four SU-R and five SU-S populations respectively. Amino acid substitutions conferring resistance in the SU-R populations were Pro
197
Ser in the
ALS1
or
ALS3
, or Asp
376
Glu in the
ALS1
and each SU-R population was composed of a single SU-R biotype. In cluster analysis each SU-R individual formed a cluster, whereas the individuals from a SU-S population belonged to different clusters. Some SU-R populations showed polymorphic AFLP loci. The results indicated that these SU-R biotypes emerged from a single mutational event and any gene flow of SU-R genes from adjacent populations did not occur. A low level of outcrossing and recombinations of SU-R genes occurred within some SU-R populations of
M. vaginalis
.
.
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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