1996
DOI: 10.1584/jpestics.21.287
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Mode of Growth Inhibitory Activity and Metabolism of Imazosulfuron in Excised Roots of Plants

Abstract: Growth inhibition activity of imazosulfuron, 1-(2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl)-3-(4, 6-dimethoxypyrimidin-2-yl)urea, against excised pea and soybean roots was investigated. Fifty percents growth inhibition concentrations of Imazosulfuron (I50) against pea and soybean roots were 17.6 and 54.2 ppb, respectively. When the excised pea roots were incubated in the culture medium containing 25 ppb of Imazosulfuron and 1mM of either branched-chain amino acids or intermediates of their biosynthetic pathw… Show more

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Cited by 12 publications
(11 citation statements)
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“…1,2) The mode of action of sulfonylurea herbicides is an inhibition of acetolactate synthase, a key enzyme in the biosynthetic pathways of branched-chain amino acids such as isoleucine and valine. [3][4][5] The selective herbicidal activity was considered to reside in rapid metabolic inactivation by the tolerant plant. 6, 7)…”
Section: Introductionmentioning
confidence: 99%
“…1,2) The mode of action of sulfonylurea herbicides is an inhibition of acetolactate synthase, a key enzyme in the biosynthetic pathways of branched-chain amino acids such as isoleucine and valine. [3][4][5] The selective herbicidal activity was considered to reside in rapid metabolic inactivation by the tolerant plant. 6, 7)…”
Section: Introductionmentioning
confidence: 99%
“…In sunlight, DOM forms reactive oxygen species (ROS) (e.g. hydroxyl radical, singlet oxygen or superoxide anion) and other reactive intermediates such as NOM, which may contribute to photolytic degradation . NOM can also retard photolysis rates via light attenuation and quenching of ROS and 3 NOM.…”
Section: Resultsmentioning
confidence: 99%
“…), a sulfonylurea herbicide, was registered for pre‐ and post‐emergent use on rice in 2010 . Sulfonylurea herbicides are valued for their high broad‐spectrum phytotoxicity, low mammalian toxicity and good crop selectivity . Although IMZ has not yet been widely adopted by California rice growers, it is expected to be mobile in rice fields owing to its high water solubility (308 mg L −1 , pH 7.0, 25 °C), low vapor pressure (4.5 × 10 −5 mPa, 25 °C) and low affinity for soils ( K d = 0.96–13.8 mL g −1 ); off‐site transport will be influenced by aqueous degradation rates and cultivar practices .…”
Section: Introductionmentioning
confidence: 99%
“…The amount of imazosulfuron left by pIJU2C9-transformed plants was only 1.2% of that left by non-transgenic plants. Imazosulfuron is mainly metabolized to HMS and/or IPSN in pea (Shimizu et al 1996) and rice (Ishida et al 1996). The proposed metabolic pathway for imazosulfuron in the transgenic rice plants is shown in Figure 4A.…”
Section: Discussionmentioning
confidence: 99%