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Phycoplast

    The phycoplast is a microtubule structure observed during cytokinesis in members of the Chlorophyceae, the largest class of green algae.
    Cytokinesis in algae occurs via a diverse range of mechanisms, including cleavage furrows in some algae and cell plates in others. Some green algae use phragmoplasts like higher plants to organize and guide the growing cell plate. In these algae, the microtubules of the telophase spindle give rise to the phragmoplast and are oriented perpendicular to the plane of cell division and the forming cell plate.
    Another common form of cell division in green algae occurs via a phycoplast. In these algea, the spindle collapses and a new system of microtubules forms that is oriented in parallel to the plane of cell division. This phycoplast can be observed in green algae undergoing cytokinesis via cleavage furrow as well as algae utilizing a cell plate. The phycoplast may play a role in assuring that the plane of cell division will pass between the two daughter nuclei. Typically, these algae undergo "closed" mitosis where the nuclear envelope persists throughout mitosis.

    References

    • P.H. Raven, R.F. Evert, S.E. Eichhorn (2005): Biology of Plants, 7th Edition, W.H. Freeman and Company Publishers, New York, ISBN 0-7167-1007-2