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Red-light-induced changes in the distribution of growth inhibitors A-2α and A-2β in dwarf pea seedlings

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Abstract

The distribution of the endogenous growth inhibitors, A-2α and A-2β, was determined in light-grown dwarf pea seedlings (Pisum sativum L. cv. Progress No. 9). Red-light-induced changes in this distribution in dark-grown pea seedlings was monitored. The concentration of both inhibitors in light-grown pea seedlings was maximal in the terminal bud and decreased to the lower parts of the seedlings; their concentration in internodes was 7–10 times that in leaves of the same nodes. After the onset of continuous red-light-irradiation, the concentration of the inhibitors in dark-grown pea seedlings increased rapidly in the terminal bud, epicotyl hook and third internode, and the longitudinal gradients of the inhibitors showed a close correlation with the red-light-induced growth inhibition of the stem. The present results suggest that the endogenous growth inhibitors, A-2α and A-2β may be responsible for the red-light-induced growth inhibition of the dwarf pea seedlings.

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Author notes

  1. Hisashi Kato-Noguchi

    Present address: Department of Bioresource Science, Kagawa University, Miki-cho, Kagawa, 761-07, Japan

Authors and Affiliations

  1. Department of Biological Fundamentals, Graduate School of Science and Technology, Kobe University, Rokkodai, Nada-ku, Kobe, 657, Japan

    Hisashi Kato-Noguchi

  2. Department of Life Science, Kobe Women's University, Higashisuma, Suma-ku, Kobe, 654, Japan

    Tohru Hashimoto

Authors
  1. Hisashi Kato-Noguchi
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  2. Tohru Hashimoto
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Kato-Noguchi, H., Hashimoto, T. Red-light-induced changes in the distribution of growth inhibitors A-2α and A-2β in dwarf pea seedlings. Plant Growth Regulation 21, 177–181 (1997). https://doi.org/10.1023/A:1005814100177

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  • DOI: https://doi.org/10.1023/A:1005814100177

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