Involvement of wall microtubules in gibberellin promotion and kinetin inhibition of stem elongation
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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 increased cell numbers 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 kinetin- 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 transverse to the cell axis.
- 日本植物生理学会の論文
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