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Visualization of cytoskeletal changes through the life cycle inAcetabularia

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Summary

The cytoskeleton in the siphonous, marine green algaAcetabularia is visualized by immunocytochemistry using antibodies against plant alfa tubulin and animal smooth muscle actin. In the vegetative phase of the life cycle, when the cell grows a cylindrical stalk and until the reproductive cap is completed, actin forms continuous, parallel bundles that extend through the entire length of the stalk and cap rays respectively. Microtubules (MTs) cannot be detected until the primary nucleus, located in the rhizoid of the giant cell, divides to form thousands of secondary nuclei. MTs can then be seen radiating from each secondary nucleus that is encountered in the stalk on its migration upwards into the cap rays. They are oriented mostly parallel to the long axis of the cell. At arrival in the cap rays up to the “white spot” stage, when nuclei assume equidistant positions in the cap ray cytoplasm, a radiating system of MTs forms around each nucleus and dramatically increases until impressive radial arrays have developed. This phase coincides with a disappearance of actin bundles in the cap rays, but they are retained in the stalk cytoplasm. Shortly after that additional MTs appear around the disk like partitions of cap ray cytoplasm. Concomitantly, bundles of actin reappear colinearly with the circumferrential MTs eventually forming complete rings around each disk of cap ray cytoplasm. During this process the compartments of the future cysts are gradually bulging outwards and simultaneously the rings of actin sink inwards until domes are formed with the nuclei fixed in the top centers of the domes. At this stage the peripheral areas of the radiating MT systems around the nuclei start to break down, whereas the circumferrential MT systems remain intact. Subsequently, the rings of both actin and MTs decrease in diameter, and finally contract to a spot opposite the nucleus, while the cysts continue to develop their oval shape. After the cysts have become separated, they round up and enter several rounds of nuclear divisions. MTs form short radial arrays around each nucleus with minor changes due to a reduction of MTs during division followed by a reappearance after completion of each division. Actin is rearranged in the cysts to a cortical network of randomly oriented, short bundles, that is maintained until gamete formation sets in.

These findings accentuate the involvement of Cytoskeletal elements in the key steps of morphogenesis inAcetabularia to an extent that is unknown in higher plants.

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  1. Zellenlehre, Universität Heidelberg, Im Neuenheimer Feld 230, D-6900, Heidelberg 1, Germany

    D. Menzel

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Menzel, D. Visualization of cytoskeletal changes through the life cycle inAcetabularia . Protoplasma 134, 30–42 (1986). https://doi.org/10.1007/BF01276373

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  • DOI: https://doi.org/10.1007/BF01276373

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