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Basal apparatus behaviour during cellular division (sporulation) in the coccoid green algaChlorosarcina

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Summary

We studied the basal body cycle (including basal body segregation, duplication, migration, and reorientation) in dividing cells of the colonial coccoid green algaChlorosarcina stigmatica using serial thin sections. Although flagella are lacking, all cells examined possess a rudimentary flagellar apparatus composed of two basal bodies linked by a distal striated fibre, two probasal bodies, and four cruciately arranged microtubular roots (2-4-2-4 type). Basal body segregation occurs at preprophase, during which two half-basal apparatuses (each consisting of one basal body, one probasal body, and a left and a right root) migrate into opposite directions. The segregation axis is defined by the two left roots which remain closely associated during segregation and slide along each other. The segregation axis is parallel to the axis of chromosome separation, and perpendicular to the plane of subsequent cell division. Duplication of basal apparatus components does not occur until telophase when daughter basal apparatuses migrate towards the plane of division. At cytokinesis which is effected by the unilateral ingrowth of a septum, each daughter basal apparatus rotates 90° and becomes associated with the new septum.

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Abbreviations

BA:

basal (body) apparatus

NBBC:

nucleus-basal body connector

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Authors and Affiliations

  1. Botanisches Institut, Universität zu Köln, Köln

    H. J. Sluiman & P. C. J. Blommers

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  1. H. J. Sluiman
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  2. P. C. J. Blommers
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Sluiman, H.J., Blommers, P.C.J. Basal apparatus behaviour during cellular division (sporulation) in the coccoid green algaChlorosarcina . Protoplasma 155, 66–75 (1990). https://doi.org/10.1007/BF01322616

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