Inheritance of sulfonylurea resistance in a paddy weed, Monochoria korsakowii [Pontederiaceae]

「INTRODUCTION」 Bensulfuron-methyl (BSM) [methyl α-[[3-(4,6-dimethoxypyrimidin-2-yl)ureido]sulfony]-o-toluate], the first sulfonylurea (SU) herbicide used in Japan, has very high herbicidal activity and low mammalian toxicity. 1) Its mode of action is through the inhibition of the enzyme acetolactate...

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Bibliographic Details
Published in:Journal of Pesticide Science 2003, Vol.28(2), pp.212-214
Main Authors: Wang, G.X. (Kyoto Univ. (Japan)), Watanabe, H, Uchino, A, Zhou, J, Itoh, K
Format: Article
Language:English
Subjects:
bensulfuron-methyl
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
GENETIC INHERITANCE
herbicide resistance
HERBICIDES
Monochoria korsakowii
PESTICIDE RESISTANCE
PONTEDERIACEAE
RICE FIELDS
sulfonylurea herbicide
SULPHONYLUREAS
WEEDS
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Summary:「INTRODUCTION」 Bensulfuron-methyl (BSM) [methyl α-[[3-(4,6-dimethoxypyrimidin-2-yl)ureido]sulfony]-o-toluate], the first sulfonylurea (SU) herbicide used in Japan, has very high herbicidal activity and low mammalian toxicity. 1) Its mode of action is through the inhibition of the enzyme acetolactate synthase (ALS; EC 4.1.3.18) (syn. acetohydroxy acid synthase), which catalyzes the first common step in the biosynthesis of the branched-chain amino acids leucine, isoleucine, and valine. 2) In Japan, BSM and other SU herbicides, such as pyrazosulfuron-ethyl (PSE)[ethyl 5-[[3-(4,6-dimethoxypyrimidin-2-yl)ureido]sulfonyl]-1H-1-methyl-pyrazole-4-carboxylate], imazosulfuron (IMS) [1-(2-chloroimidazo[1,2-α]pyridin-3-ylsulfonyl)-3-(4,6-dimethoxypyrimidin-2-yl)urea] and ethoxysulfuron (ETS) [3-(4,6-dimethoxypyrimidin-2-yl)-1-(2-ethoxyphenoxysulfonyl)urea] have been widely used for early post-emergence control of broadleaved and some sedge weeds. 1) A biotype of M. korsakowii, an annual paddy weed resistant to BSM, has been discovered in Hokkaido ricefields that were treated with BSM-based herbicides for five consecutive years. 3) It was the first confirmed occurrence of herbicide resistance resulting from the use of an SU herbicide in Japan.
ISSN:0385-1559
1348-589X
1349-0923
DOI:10.1584/jpestics.28.212