Formation of a phragmosome-like structure in centrifuged protonemal cells of Adiantum capillus-veneris L. |
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Authors: | Takashi Murata Masamitsu Wada |
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Affiliation: | (1) Department of Life Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153, Japan, JP;(2) Department of Biology, Faculty of Science, Tokyo Metropolitan University, Minami-ohsawa, Hachioji, Tokyo 192–03, Japan, JP |
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Abstract: | A phragmosome (PS) is a transvacuolar aggregation of cytoplasm that develops in the plane of future cytokinesis and is found specifically in highly vacuolated cells. Although protonemal cells of Adiantum capillus-veneris L. usually do not form a PS, a PS-like structure developed at the site of a preprophase band (PPB) of microtubules (MTs) when the nucleus and endoplasm were displaced from the division site by centrifugation, leaving a PPB in the cortical cytoplasm. The PS-like structure contained endoplasmic MTs, F-actin, oil droplets and mitochondria. The structure did not develop when the cells were centrifuged before the formation of a PPB. Application of amiprophos-methyl (APM) before development of the PPB strongly inhibited the formation of the PS-like structure after centrifugation. The PS-like structure was dispersed after cytokinesis which occurred in the region of the displaced nucleus. Treatment with APM after the formation of the PS-like structure arrested the cell cycle at the M phase and inhibited the degradation of this structure. These results suggest that development of a PS-like structure is associated both with the formation of a PPB and with the stage of the cell cycle. Received: 9 July 1996 / Accepted: 12 September 1996 |
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Keywords: | :Adiantum Cytokinesis Microtubule Phragmosome Preprophase band Protonema |
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