Summary
Postmitotic nuclear migration and anchoring inMicrasterias seems to be mediated by two distinct microtubule (MT)-systems: the moving MT-system, called “posttelophase system of MT” (PTS) which arises from a node-like structure, possibly a microtubulecenter (MC) and the anchoring MT-system, called “isthmus system of MT” (IS) which surrounds the nucleus at its central position. The nucleus or parts of its envelope seems to be involved in the nucleation and orientation of these MT-systems. The moving force of the nuclear migration process obviously originates from interaction between the MT-system (PTS) and its adjacent microfilaments.
Under the influence of the herbicide amiprophos-methyl (APM) a destruction of both of the MT-systems followed by a disoriented nuclear migration occurs.
Recovery experiments after APM treatment revealed a reestablishment of both the PTS and the IS although a disoriented formation could often be observed. Depending on the orientation of the reestablished MT-system (PTS) either remigration of the nucleus or dislocated anchoring at one of the lobe invaginations of the cell takes place. An interaction between the nucleus and distinct sites of the plasma membrane is discussed.
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Meindl, U. Cytoskeletal control of nuclear migration and anchoring in developing cells ofMicrasterias denticulata and the change caused by the anti-microtubular herbicide amiprophos-methyl (APM). Protoplasma 118, 75–90 (1983). https://doi.org/10.1007/BF01284749
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DOI: https://doi.org/10.1007/BF01284749