Quizalofop によるトウモロコシ根端および茎頂部分裂組織構造の変化

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1件

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タイトル別名
  • Histological Changes in Root and Shoot Apical Meristematic Tissues of Corn Treated with Quizalofop
  • Quizalofop ニ ヨル トウモロコシ コンタン オヨビ ケイチョウブ
  • Mechanism of Action of the Herbicide Quizalofop-ethyl (Part 3)

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Histological effects of quizalofop, 2-[4-(6-chloro-2-quinoxalinyloxy) phenoxy] propionic acid, on root development and stem-base meristems in corn plants were studied. Elongation of the root was inhibited markedly by 0.1μM of the R(+)-isomer, but 10.0μM of the S(-)-isomer was required in order to produce the comparative inhibition. Quizalofop disrupted the mitotic process of the root tip. However, its effect was apparently secondary because the response to the inhibition of root elongation on the mitotic process was delayed about 10hr. Histological observation showed that damage started in the elongating zone of a root tip and spread to the meristematic zone. Histological effect of R(+)-quizalof op translocated into the stem-base region was characterized by severe damage in the primary thickening, intercalary and leafmarginal meristems, while there was little or no effect in the apical meristem. Differences in the histological effects of quizalofop might be due to the difference in translocation in the tissue and/or to the difference in sensitivity in the tissue to an increase in lipid metabolic turnover coincident with ACC activation because quizalofop dramatically inhibits ACC at very low dosage levels.

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