Phycoplast | Wikipedia audio article
Channel: wikipedia tts
Date: 30/10/2018

This is an audio version of the Wikipedia Article:
Phycoplast

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SUMMARY
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The phycoplast is a microtubule structure observed during cytokinesis in members of the Chlorophyceae, the largest class of green algae.
Cytokinesis in green algae occurs via a diverse range of mechanisms, including cleavage furrows in some algae and cell plates in others. Some green algae of the class Charophyceae use phragmoplasts similar to those in embryophytes 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. The growth of the cell plate eventually disrupts the telophase spindle (see case 4 in picture).
In the Chlorophyceae, the most common form of cell division occurs via a phycoplast. In these algae, 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 algae undergoing cytokinesis via cleavage furrow (case 1 in picture) as well as algae utilizing a cell plate (case 3 in picture). 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.