Phragmoplast


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phragmoplast

[′frag·mə‚plast]
(cell and molecular biology)
A thin barrier which is formed across the spindle equator in late cytokinesis in plant cells and within which the cell wall is laid down.

Phragmoplast

 

in higher plants, a formation that arises between the daughter nuclei during cell division and that consists of microtubules, ducts of the endoplasmic network, and tiny pectin granules. In the equatorial plane of the phragmoplast there occurs an aggregation of bubbles, probably derivatives of the Golgi complex, which develop into a cellular septum, that is, a membrane that becomes the cell wall. Cellulose is deposited on both sides of the wall. Gradually, as the cell wall is formed, the phragmoplast moves toward the periphery of the mother cell and continues to function until there is closure of the newly formed cell wall with the membrane of the mother cell.

References in periodicals archive ?
Phragmoplast formation after second meiosis is complex and is mediated by a quadripolar structure of merged phragmoplasts similar in appearance to the initial QMS.
It delivers the two groups of chromosomes to positions adjacent to the polar furrows midway between pairs of plastids in anaphase and a phragmoplast is constructed in the midzone (Fig.
The first division phragmoplast is very well developed (Fig.
The resultant phragmoplast complex guides deposition of intersporal septae in simultaneous cytokinesis (Fig.
Following chromosome separation in first meiosis, a well-developed phragmoplast begins as a bipolar array in the interzone (Fig.
Following chromosome separation a phragmoplast system develops (Fig.
A distinct phragmoplast develops in the interzonal region in telophase I but no cell plate develops and cytokinesis is simultaneous.
A phragmoplast develops in the interzonal region and expands to the equatorial cleavage furrows (Fig.
gamma]-Tubulin organizes phragmoplast microtubules between sister nuclei in telophase II (Fig.
Primary phragmoplasts are initiated in the interzones of spindles and additional microtubules emanating from non-sister nuclei/plastids give rise to secondary phragmoplasts that interconnect the nuclei and define the division planes (Fig.
Phragmoplasts develop between pairs of telophase II nuclei (Fig.
gamma]-Tubulin localization changes from discrete polar organizers to anastral spindles and phragmoplasts in mitosis of Marchantia polymorpha L.