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

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In azuki bean (Azukia angularis=Vigna angularis) epicotyl sections, 5 × 10^<-4> M coumarin inhibited the incorporation of radioactivity from [U-^<14>C]glucose into the cellulose fraction by 35% in the absence of indole-3-acetic acid (IAA) and by 401 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 pro-moting effect of 1 × 10^<-5> M gibberellin A_3 (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 synthesis was observed with 1 × 10^<-3> M colchicine, 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 micro-tubules, while a disrupting effect on wall microtubules was clearly demonstrated with 3 × 10^<-4> M colchicine. From these results, the possible involvement of cellulose synthesis in cell expansion controlled by GA or kinetin was suggested.
日本植物生理学会の論文