1994 年 58 巻 7 号 p. 1336-1337
3-Thiophenecarboxylic acid (1) showed strong growth-inhibitory activity toward the following plants but not Glycine max Merrill ; Brassica campestris subsp. rapa Hook. fil. et Anders, Sesamum indicum L., Lactuca sativa L. var. longifolia LAM, Echinochloa utilis OHWl et YABUNO and Allium tuberosum ROTTLER. Compound 1 strongly inhibited the growth of roots of S. indicum and L. sativa even at the low concentration of 5.0 × 10-5 M. The growth-inhibitory activity of1-related compounds (2-6) on S. indicum was also studied. Among the compounds, 3-thiopheneacetic acid (6) showed the strongest inhibitory activity, but 3-thiophenecarboxaldehyde (2), 3-thiophenemethanol (3), and 3-thiophenecarboxamide (5) showed no activity. The radicles of plants treated with these active compounds showed negative geotropism.
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