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Plant and Cell Physiology, 1974, Vol. 15, No. 2 265-272
© 1974

Article

Involvement of cellulose synthesis in actions of gibberellin and kinetin on cell expansion. Gibberellin-coumarin and kinetin-coumarin interactions on stem elongation

Taizo Hogetsu, Hiroh Shibaoka and Masami Shimokoriyama

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

In azuki bean (Azukia angularis = Vignia angularis) epicotyl sections, 5 × 10–4 M coumarin inhibited the incorporation of radioactivity from [U–14C]glucose into the cellulose fraction by 35% in the absence of indole-3-acetic acid (IAA) and by 40% in the presence of 1 × 10–4 M IAA. There was no inhibitory effect on the incorporation of radioactivity into the other fractions. Coumarin at 5 × 10–4 M reversed the promoting effect of 1 × 10–5 M gibberellin A3 (GA) and the inhibitory effect of 1 × 10–5 M kinetin on IAA-induced elongation of sections with no significant effects on IAA-induced elongation. Neither GA nor kinetin had any appreciable effects on cellulose synthesis. No inhibition of cellulose syntheis was observed with 1 × 10–3 M colchichine, which has been reported to have effects similar to those of coumarin on GA- or kinetin-affected stem elongation. Coumarin at 5 × 10–4 M was ineffectual in breaking up wall microtubules, while a disrupting effect on wall microtubules was clearly demonstrated with 3 × 10–4M colchicine.

From these results, the possible involvement of cellulose synthesis in cell expansion controlled by GA or kinetin was suggested.

(Received August 3, 1973; )
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