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Plant and Cell Physiology, 1974, Vol. 15, No. 2 255-263
© 1974

Article

Involvement of wall microtubules in gibberllin promotion and kinetin inhibition of stem elongation

Hiroh Shibaoka

Department of Botany, Faculty of Science, University of Tokyo Hongo, Tokyo, Japan

The elongation of light-grown azuki bean (Azukia angularis = Vigna angularis) epicotyl segments was promoted by indoleacetic acid (IAA) and this IAA-induced elongation was inhibited by both kinetin and benzimidazole (BIA). Increased stem thickening was observed with kinetin- or BIA-treated segments, but this was not accompanied by incresed cell number in the transverse direction, suggesting that both kinetin and BIA promoted lateral cell expansion. Colchicine at a concentration with no effect on IAA-induced elongation reversed both the kinetic- and BIA-induced inhibition.

Electron-microscopic examination revealed that wall microtubules in cells treated with kinetin together with IAA ran parallel to the cell axis, while wall microtubules in cells treated with only IAA were randomly oriented. In the cell treated with gibberellin together with IAA, wall microtubules ran tranverse to the cell axis.

(Received July 13, 1973; )
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