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IAA-induced opening of excisedMimosa pulvinules

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Abstract

Movement ofMimosa pudica L. pulvinules was investigated by using excised ones which were placed on a moist filter paper. The pulvinules excised in the morning opened at the addition of IAA (10−7 M to 10−4M) in the dark. The lag period for the onset of the opening was about 15 min. Na-acetate buffer (pH 4) also induced the opening of pulvinules in the dark, and the buffer-induced opening was inhibited by the uncouplers of oxidative phosphorylation. Na-MES and Na-citrate buffers (pH 4) did not induce the opening.

Pulvinules taken from closed leaves in the evening were less responsive to IAA than those taken from open leaves in the morning. The pulvinules taken in the evening slightly opened with incandescent light (4000 lux), but those preincubated with IAA (10−7M and 10−6M) opened distinctly upon the illumination.

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Abbreviations

CCCP:

carbonyl cyanidem-chlorophenylhydrazone

CH:

cycloheximide

DNP:

2,4-dinitrophenol

DMSO:

dimethyl sulfoxide

GA:

gibberellic acid

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Author notes

  1. Shozo Suda

    Present address: Department of Biology, Kobe Women's University, Higashi-Suma, 654, Kobe

Authors and Affiliations

  1. Department of Biological Fundamentals, The Graduate School of Science and Technology Kobe University, Rokkodai, 657, Kobe

    Seiji Tsurumi & Shozo Suda

  2. Faculty of Science, Kobe University, Rokkodai, 657, Kobe

    Yoshihiko Asahi

Authors
  1. Seiji Tsurumi
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  2. Yoshihiko Asahi
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  3. Shozo Suda
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Tsurumi, S., Asahi, Y. & Suda, S. IAA-induced opening of excisedMimosa pulvinules. Bot Mag Tokyo 98, 89–97 (1985). https://doi.org/10.1007/BF02488909

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  • DOI: https://doi.org/10.1007/BF02488909

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