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 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.


*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

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Phycoplast — Schematische Darstellung der Zellteilungstypen bei verschiedenen Grünalgen: 1) Phycoplastbildung mit Trennungsfurche (zum Beispiel Chlamydomonas); 2) Trennungsfurche und bestehendem Spindelapparat (zum Beispiel Klebsormidium); 3) Phycoplast und… …   Deutsch Wikipedia

  • phycoplast — noun An array of microtubules involved in the formation of cell walls …   Wiktionary

  • Mitosis — Not to be confused with meiosis, miosis, or myositis. Mitosis divides the chromosomes …   Wikipedia

  • Phragmoplast — The phragmoplast is a plant cell specific structure that forms during late cytokinesis. It serves as a scaffold for cell plate assembly and subsequent formation of a new cell wall separating the two daughter cells.The phragmoplast is a complex… …   Wikipedia

  • Phragmoplast — Der Phragmoplast (von griech. phrágma = Abgrenzung und plástes = Bildner, Former) oder auch „Wandbildner“ ist die Vorstufe der Zellwandplatte bei Pflanzen. Er besteht aus einem Komplex aus Mikrotubuli, Mikrofilamenten und endoplasmatischem… …   Deutsch Wikipedia

  • Trebouxiophyceae — Systematik Klassifikation: Lebewesen Domäne: Eukaryoten (Eucaryota) ohne Rang: Archaeplastida ohne Rang: Chloroplastida …   Deutsch Wikipedia

  • Ulvophyceae — Meersalat (Ulva lactuca) Systematik Klassifikation: Lebewesen Domäne …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.