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5,6-Dichloroindole-3-acetic acid as a potent auxin: its synthesis and biological activity

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Summary

5,6-Dichloroindole-3-acetic acid (1), a new auxin, has been synthesized by Fischer's indolization. It showed the strongest auxin activity among all the known natural and synthetic auxins in three bioassays (elongation ofAvena coleoptiles, hypocotyl growth inhibition of Chinese cabbage, and hypocotyl swelling of mung bean seedlings). It induced many lateral roots in mung bean seedlings, and resisted peroxidase-catalyzed decomposition.

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Authors and Affiliations

  1. Department of Agricultural Chemistry, Nagoya University, Chikusa-ku, 464, Nagoya, Japan

    T. Hatano, M. Katayama & S. Marumo

Authors
  1. T. Hatano
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  2. M. Katayama
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  3. S. Marumo
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Additional information

The bioassy has been routinely conducted in our laboratory in order to examine the long term activity of auxins on the growing intact plants. An extent of the hypocotyl inhibition is in proportion to the amount of 2,4-D and 4-Cl-IAA in a concentration range of 10−6 to 10−4 M.

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Hatano, T., Katayama, M. & Marumo, S. 5,6-Dichloroindole-3-acetic acid as a potent auxin: its synthesis and biological activity. Experientia 43, 1237–1239 (1987). https://doi.org/10.1007/BF01945542

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  • DOI: https://doi.org/10.1007/BF01945542

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