Journal Article

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

Ken-ichi Tsurusaki, Yasuko Masuda and Naoki Sakurai

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 3, pages 352-356
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029173
Distribution of Indole-3-Acetic Acid in the Apoplast and Symplast of Squash (Cucurbita maxima) Hypocotyls

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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.

Keywords: Apoplast; Cucurbita maxima; Hypocotyl; IAA; Squash; Symplast

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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