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Plant and Cell Physiology, 1997, Vol. 38, No. 3 352-356
© 1997

Distribution of Indole-3-Acetic Acid in the Apoplast and Symplast of Squash (Cucurbita maxima) Hypocotyls

Ken-ichi Tsurusaki1, Yasuko Masuda2 and Naoki Sakurai2

1 Faculty of Liberal Arts, Fukuyama University Fukuyama, 729-02 Japan
2 Department of Environmental Studies, Faculty of Integrated Arts & Sciences, Hiroshima University Higashi-Hiroshima, 739 Japan

The concentration of endogenous IAA was higher in an apoplastic solution (2.3xl0–7M) than in a symplastic solution (0.5 x 10–7 M) obtained from segments of etiolated squash (Cucurbita maxima Duch.) hypocotyls. Exogenously applied IAA (10–5 M) increased the level of IAA in both the apoplastic and the symplastic solution. The concentration of IAA in the apoplastic solution increased to 75% of the concentration of exogenous IAA in 4 h, but that in the symplastic solution increased only to 23% of the concentration of exogenous IAA. These results demonstrate that the concentration of endogenous IAA is higher in the apoplast than in the symplast of squash hypocotyls, and they suggest that IAA exerts its physiological effects, at least to some extent, from the outside of cells.

(Received September 20, 1996; Accepted January 10, 1997)
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