Everything about The Phycoplast totally explained
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 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. 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's 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.
Further Information
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