The Effects of Light Irradiation on Orientation of Microtubules in Seedlings of Avena sativa L. and Pisum sativum L.
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概要
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The effects of light irradiation on the arrangement of cortical microtubules (MTs) were examined in etiolated Avena mesocotyls and coleoptiles, and in Pisum epicotyls. Elongation of Avena mesocotyls ceased as a result of irradiation with white light within I h. The predominant orientation of MTs became more longitudinal within I h in epidermal cells and changed from transverse to oblique, after the elongation ceased, in parenchymal cells. Irradiation with red and with blue light also caused cessation of cell elongation and the same changes in the orientation of MTs. Elongation of Avena coleoptiles ceased as a result of irradiation with white light within 24 h. The predominant orientation of MTs became more longitudinal in epidermal cells and changed from transverse to oblique in parenchymal cells. The change in orientation of MTs in epidermal cells preceded that in parenchymal cells. In Pisum epicotyls, elongation ceased as a result of irradiation with white light within I h. Although the orientations of MTs in epidermal cells did not show any remarkable change, those in parenchymal cells changed from transverse to oblique after cell elongation ceased. The change in orientation of MTs and the cessation of cell elongation of A vena mesocotyls induced by white-light irradiation were both significantly retarded by treatment with IAA. This result suggests that IAA is involved in maintaining the transverse orientation of MTs in Avena mesocotyls.
- 日本植物生理学会の論文
著者
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Iwata Kazuyoshi
Department Of Pure And Applied Sciences College Of Arts And Sciences University Of Tokyo
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Iwata Kazuyoshi
Department Of Chemistry Yale University:(present Address) Textile Research Institute Fukui Universit
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Hogetsu Taizo
Department Of Botany Faculty Of Science University Of Tokyo
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