イマゾスルフロンの植物切断根における生長抑制作用機構および代謝

DOI NDLデジタルコレクション 日本農学文献記事索引 Web Site Web Site 被引用文献4件 参考文献10件
  • 清水 直史
    Agricultural Research Laboratories, Agro Division, Takeda Chemical Industries, Ltd.
  • 坂本 順子
    Pharmaceutical Research Laboratories, Pharmaceutical Research Division, Takeda Chemical Industries, Ltd.
  • 神園 博史
    T. N. Technos Co., Ltd.
  • 太田 一成
    Agricultural Research Laboratories, Agro Division, Takeda Chemical Industries, Ltd.
  • 田代 茂喜
    Agricultural Research Laboratories, Agro Division, Takeda Chemical Industries, Ltd.

書誌事項

タイトル別名
  • Mode of Growth Inhibitory Activity and Metabolism of Imazosulfuron in Excised Roots of Plants
  • Mode of Growth Inhibitory Activity and

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説明

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 54.2ppb, respectively. When the excised pea roots were incubated in the culture medium containing 25ppb of imazosulfuron and 1mM of either branched-chain amino acids or intermediates of their biosynthetic pathways, the growth inhibition activity of excised roots was alleviated by the combination of isoleucine and valine or α-ketoisovalerate and α-keto-β-methyl-n-valerate. These findings suggest that imazosulfuron exhibits inhibition of acetolactate synthase which catalyses the biosynthetic pathways of branchedchain amino acids. Metabolic fate of imazosulfuron in excised pea roots was studied using the 14C-labeled compounds. imazosulfuron was predominantly demethylated to afford a monodemethyl derivative (HMS) in the roots, and hydrolytically cleaved at the sulfonylurea bond to give a sulfonamide (IPSN) and an aminopyrimidine (ADPM) in the culture medium. Since HMS did not inhibit the growth of excised roots, metabolic fate of imazosulfuron is involved in a selectivity between plants.

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