Gibberellin A_3 and Abscisic Acid Cause the Reorientation of Cortical Microtubules in Epicotyl Cells of the Decapitated Dwarf Pea
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概要
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To determine whether or not the changes in the orientation of microtubules (MTs) that are induced by GA_3 and ABA result from changes in the rate of epicotyl elongation caused by these hormones, we examined the effects of GA_3 and ABA on the orientation of MTs in epidermal cells of decapitated epicotyls of the dwarf pea (Pisum sativum cv. Little Marvel), in which neither GA_3 nor ABA causes changes in the rate of epicotyl elongation. Cuttings taken from GA_3-pretreated seedlings were decapitated and treated with ABA. ABA eliminated the GA_3-induced predominance of transverse MTs and treatment with ABA resulted in a predominance of longitudinal MTs in the decapitated cuttings. However, ABA did not reduce the rate of epicotyl elongation in these samples. Cuttings taken from ABA-pretreated seedlings were decapitated and treated with GA_3・GA_3 caused the orientation of MTs to change from longitudinal to transverse in the decapitated cuttings. However, GA_3 had no promotive effect on elongation of these epicotyls. The results indicate that both ABA and GA_3 have the ability to change the orientation of MTs by mechanisms that do not involve changes in the rate of cell elongation.
- 日本植物生理学会の論文
著者
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Shibaoka Hiroh
Department Of Biology Faculty Of Science Osaka University
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Sakiyama-sogo Mari
Department Of Biology Faculty Of Science Osaka University
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